Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.3390/life12111752

Language：English   Publishing type：Research paper (scientific journal)  

Rice is gaining importance for nutrition in sub-Saharan Africa, but domestic production can only cover a fraction of the actual needs. Suboptimal fertilization limits production and affordable solutions are needed. It is, however, of utmost importance to minimize negative impacts on the environment and on soil health, which is largely determined by microbial processes. An agronomic field trial was conducted at the KALRO Mwea research site (Central Kenya) to compare mineral and organic fertilization effects on rice plant parameters and on soil microbial abundance and diversity. Abundance of fungi and bacteria was quantified by ddPCR and the community composition was determined by amplicon sequencing of the ITS2- and 16S-regions, respectively. Mineral fertilizer had a strong positive effect on panicle number, spikelet number, grain yield and straw dry weight, but fertilizer type did not significantly influence soil microbial community abundance or composition. The rice development stage shaped fungal communities with differences between the vegetative and the reproductive stages, whereas the bacterial communities were mainly influenced by soil depth in a range from 0 to 30 cm. Additionally, spatial effects between rows of the experimental field were observed, resulting in row-specific differences in soil organic carbon, total nitrogen and certain fungal taxa, notwithstanding that the field was manually ploughed to a depth of 30 cm before the experiment. This study is the first census of soil fungal and bacterial communities in an African paddy rice field and provides insights into similarities and differences to paddy rice fields in other regions. To increase local African rice production, manure application alone might not be sufficient due to the poor nutrient status of traditional farm-yard manure, yet it can be part of a sustainable and more efficient fertilization strategy.

DOI： 10.1016/j.apsoil.2022.104495

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

In the rice growing area of Kenya’s highlands, the development of a water-saving rice cultivation system is a key strategy because the shortage of irrigation water is a frequently occurring problem. The purpose of this study was to investigate the effect of alternate wetting and drying (AWD) on the growth and yield of rice under the unique cultivation environment of tropical highlands. Field experiments were performed over a period of four years (2014–2017) in a paddy field. Dry matter production of a lowland variety, Basmati 370, was greater under continuous flooding (CF) than under AWD. In years with low minimum temperature (less than 15 °C) during the reproductive and ripening stages, filled grain ratios were significantly higher under AWD than under CF. Accordingly, higher dry matter production under CF did not contribute to grain yield. In the years when rice was not exposed to low minimum temperature during the reproductive and ripening stages, filled grain ratio did not decrease even under CF. Therefore, there was no difference between filled grain ratio under AWD and CF. Our results indicated that AWD could mitigate the decline in grain filling, induced by low minimum temperature during the reproductive and ripening stages in Basmati 370, under the cultivation conditions in tropical highlands. Although AWD may reduce the above-ground biomass, its mitigation effect on grain filling could outweigh this drawback and can still be beneficial to rice farmers in the tropical highlands.

DOI： 10.3390/agronomy11112345

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan International Research Center for Agricultural Sciences  

<p>A decrease in the filled grain ratio (FGR) under high nitrogen (N) conditions inhibits the increase in rice yield in the tropical highlands of equatorial East Africa. We hypothesized that, under high N fertilization, the decrease in FGR is due to low temperatures during the reproductive growth stages, and that high grain yield can be achieved using cold tolerant varieties. Two cold-susceptible varieties (BW196 and Komboka) and a cold-tolerant variety (NERICA 1) were grown under 57, 114, and 171 kg N ha⁻¹ of N fertilization. Grain yield increased with a higher N fertilization rate only in NERICA 1. Shoot dry weight and total spikelet number increased in all varieties under high N conditions. Although FGR decreased with increases in N fertilization rate in all varieties, the adverse effects of high N fertilization on FGR were least observed in NERICA 1. However, temperature did not affect FGR in all N treatments, growth stages, and varieties, except for Komboka during the ripening stage under high N conditions. The findings did not support the hypothesis that high-N-induced decreases in FGR are due to low temperatures. High-N-induced decreases in FGR in Komboka were mainly attributable to the poor filling of spikelets during the ripening stage due to excess total spikelets. Factors other than filling high-N-promoted increases in total spikelet number may affect FGR in BW196 and NERICA 1 under high N conditions in Mwea.</p>

DOI： 10.6090/jarq.55.209

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：WILEY  

Drought is one of the most serious constraints to rice cultivation, even under alternate wetting and drying (AWD), which is a water-saving management practice. In rice, enhanced root development is essential for stable shoot growth, adaptability and productivity under water deficit environments. We identified and characterized outstanding rooting1 (our1) rice mutant using hydroponics. The present study sought to examine morphological root traits of the our1 mutant and the role of the mutation gene in shoot growth and yield under AWD. Thus, we evaluated the growth performance of the our1 rice mutant in pot experiments and under field AWD conditions in Kenya. The experiments were conducted with our1 mutant, its wild type and their progenies under both AWD and continuously waterlogged (CWL) conditions. The our1 mutant possessed a well-developed root system and exhibited particularly enhanced thin root development, which was maintained from the early vegetative stage through the reproductive stage under both pot and field AWD management. This enhanced root development promoted shoot growth through increased water uptake during rewatered conditions between drought periods in AWD. In addition, the our1 mutant showed enhanced shoot growth during the reproductive stage, resulting in the maintenance of yield under AWD fields. Genotypes harbouring our1 mutation gene showed higher yields compared to wild-type genotypes which was attributed to their higher photosynthetic ability as a result of enhanced root activity. These results suggest the important role of a well-developed root system architecture and enhanced root function in stabilizing rice yields under water-limited environments. Our findings indicate that the our1 mutation gene can serve as a novel breeding material to mitigate the impact of transient drought stress on yield under AWD.

DOI： 10.1111/jac.12524

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：TAYLOR & FRANCIS LTD  

Sago palm (Metroxylon sagu Rottb.) photosynthetic performance was evaluated under drought conditions through leaf gas exchange and chlorophyll a fluorescence measurement. Drought has an impact on sago palm's leaf gas exchange parameters and its chlorophyll fluorescence of PSII. Stomatal limitations were found to be the main factor limiting photosynthetic activities of sago palm under drought conditions. Photosynthetic rate decreased following the inhibition in the PSII reaction center. Early detection of interference upon the efficiency of the PSII reaction center due to drought stress was recorded by chlorophyll a fluorescence measurement.[GRAPHICS].

DOI： 10.1080/1343943X.2020.1794914

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：TAYLOR & FRANCIS LTD  

DOI： 10.1080/1343943X.2020.1809218

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Wiley  

DOI： 10.1002/agg2.20191

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/agg2.20191

Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：TAYLOR & FRANCIS LTD  

Cold tolerance of New Rice for Africa (NERICA) and their parent varieties was evaluated under natural air temperature conditions of Kenyan tropical highlands using the multiple-sown field evaluation method. Rice varieties were cultivated 10 times to expose them to a shift in temperature during 20-day periods before heading (critical period), measuring the average daily mean temperature during the critical period (T-mean) for each variety and filled grain ratio, which was used as an indicator of cold tolerance. T(mean)of each variety was low in 6 out of 10 experiments. In the remaining four high-temperature experiments, there were no significant varietal differences in filled grain ratio. In the six low-temperature experiments, all varieties experienced 20.1-21.5 degrees C T-mean. After comparison under virtually the same cold stress, NERICA 1, 3, 4, 7-10, 12, 17, 18, and WAB 56-104 were judged as cold-tolerant; NERICA 2, 5, 11, 13, and 14, and WAB 56-50 and 181-18 were moderately tolerant, and NERICA 6, 15, and 16 were cold-susceptible varieties. These evaluations generally corresponded with previous experimental results under temperature-controlled environments, showing the practicality of multiple-sown field cold tolerance evaluation in Kenya. It also indicated that NERICA varieties, which recorded different levels of cold tolerance and whose average number of days to heading in all experiments were 66-78, are suitable as a set of standard check varieties in this region to evaluate cold tolerance of rice varieties with this range of days to heading.

DOI： 10.1080/1343943X.2020.1777877

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Cropping calendar optimization contributes to an increase in rice yield. Information on the seasonal variation in grain yield and climate conditions is necessary to determine an appropriate cropping calendar. We sought to find the optimal cropping calendar in Mwea, Kenya, in a tropical highland in equatorial East Africa. We conducted a series of 58 experiments using a local popular rice variety, Basmati 370, between 2013 and 2016, using a secured water supply and adequate blast control, sowing every 15 days. The grain yield was 0-2 t ha(-1) when the variety was sown between March and June. This poor grain yield was attributable to the low temperature and low solar radiation from May to September. In contrast, the grain yield was always more than 3 t ha(-1) when the variety was sown between July and February. Sowing Basmati 370 between March and June is not recommended, because it may lead to a suboptimal yield due to cold stress. The current cropping calendar (July-December or August-January) is acceptable even under abundant year-round water supply, but sowing between October and February is a good alternative sowing period for single rice cropping. Rice production per year is expected to increase to >100% with the introduction of double cropping by adding cultivation from between January and February before the current cropping calendar. These findings serve as useful references for considering and determining the appropriate calendar options for single and double cropping of rice in tropical highlands in equatorial East Africa.

DOI： 10.1080/1343943X.2020.1727752

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Drought cycling and soil re-watering trends due to intermittent rainfall patterns are key stress factors that influence rice growth and yield under upland cultivation conditions. However, upland rice adaptation responses to fluctuating soil moisture conditions remain poorly understood. This study investigated root and shoot responses of upland New Rice for Africa (NERICA) varieties to episodic drought and re-watering during growth. We examined root and shoot growth of NERICA 1 and NERICA 4 compared with those of IR72, an improved lowland variety, and Dular, a traditional drought-tolerant variety, in terms of soil moisture fluctuations with different levels of nitrogen fertilization under field conditions that impeded deep root development. During soil moisture fluctuation, all varieties reduced shoot dry weight compared with well-watered plants, regardless of nitrogen fertilization levels. However, total root length for the three upland varieties was enhanced by soil moisture fluctuations at moderate and high nitrogen fertilization, while that of the lowland variety was reduced. Comparing root development during water fluctuations revealed that NERICA 1 had a greater root system than NERICA 4, which was attributed to lateral root development. Furthermore, we found that NERICA varieties increase lateral root mass during soil desiccation under adequate nitrogen fertilization, while Dular and IR72 reduced their root growth rate during drought and increased it after re-watering. Both root growth patterns developed, from around maximum tillering to heading. The analysis of regression between root elongation and shoot growth with fluctuating soil moisture indicated that an enhanced root system during drought, on adequate nitrogen fertilization, can contribute to shoot growth when sufficient water becomes available, specifically around the maximum tillering to the heading growth stage of rice.

DOI： 10.1111/jac.12390

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Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYTOPATHOLOGICAL SOC  

A total of 99 isolates of rice blast (Pyricularia oryzae Cavara) were collected from 2010 to 2015 from four regions in Kenya: Kirinyaga County and Embu County, Kisumu County, Tana River County, and Mombasa County. The pathogenicities of these isolates were clarified based on the reaction patterns of Lijiangxintuanheigu and differential varieties (DVs) targeting 23 resistance genes. The frequency of virulent isolates was high for DVs for Pib, Pia, Pii, Pi3, Pi5(t), Pik-s, Pik-m, Pi1, Pik-h, Pik, Pik-p, Pi7(t), Pi19(t), and Pi20(t); low for DVs for Pish, Pi9(t), Piz-5, and Piz-t; and intermediate for the remaining DVs for Pit, Piz, Pita-2, Pita, and Pi12(t). These blast isolates were classified into three cluster groups: Ia, Ib, and II. The frequencies of virulent isolates to DVs for Pit, Pii, Pik-m, Pi1, Pik-h, Pik, Pik-p, Pi7(t), Piz, and Pi12(t) differed markedly between clusters I and II, and those of DVs for Pib, Pit, Pia, Pi3, Pita-2, Pita, and Pi20(t) differed between Ia and Ib. The frequencies of cluster groups in the four geographical regions were different. A total of 62 races were found, with 19 blast isolates categorized into one race (U63-i7-k177-z00-ta003), whereas the other races included only some isolates in each.

DOI： 10.1094/PDIS-04-19-0870-RE

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：TAYLOR & FRANCIS LTD  

This study evaluated the effect of three N fertilization levels 60 (low), 120 (medium), and 180 (high) kg N ha(-1) and soil moisture content gradients created by a line-source sprinkler on the expression of plasticity in lateral root branching and dry matter production (DMP) of upland new rice for Africa (NERICA) 1 and 4. There were no significant differences in DMP between NERICA 1 and 4 under well-watered, mild drought, and severe drought conditions regardless of N level. In contrast, under moderate drought (12-21% v/v of soil moisture content [SMC] in 2011 and 16-24% v/v of SMC in 2012), NERICA 1 had significantly higher shoot dry weight, total root length (TRL), lateral root length, and branching index than NERICA 4 at medium and high N; however, there was no significant difference between the two NERICAs in DMP at low N. TRL of NERICA 1 was significantly higher under moderate drought than well-watered conditions, but only with medium and high N. Regardless of N level, moderate drought did not enhance NERICA 4's root system. Thus, NERICA 1's root system exhibited plastic development, promoting lateral root branching at medium and high N. These morphological changes were associated with the greater DMP in NERICA 1 than NERICA 4 under moderate drought, whereas the lack of such plasticity at low N meant genotypic differences in DMP were obscured. Our findings implied that N application can improve upland NERICA productivity under moderate drought conditions, but differences in variety and field conditions may influence efficacy.

DOI： 10.1080/1343943X.2018.1561194

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：TAYLOR & FRANCIS LTD  

In this study, we aimed to clarify the effects of different water management strategies on dry matter production and yield performance of New Rice for Africa (NERICA) varieties. Dry matter production of NERICA 1 and NERICA 5 was compared with that of Yumenohatamochi, a Japanese upland variety, and Hinohikari, a Japanese lowland variety under three water regimes, i.e. continuously flooded, supplemental irrigation, and non-irrigation (rainfed). Total carbohydrate content in the panicles under different watering regimes was more closely related to post-heading photosynthates than pre-heading reserve assimilates. Dry matter production during ripening tended to decrease under low soil water conditions, whereas the dry matter translocated from the leaf and stem to the panicle tended to increase. Consequently, the distribution ratio of post-heading photosynthates in the total carbohydrate content declined in response to the reduction in available soil moisture. These results indicate that the total carbohydrate content vary depending on the soil water conditions. In NERICAs, dry matter production during ripening was lower than that in Japanese varieties, indicating that their dependence on pre-heading reserve assimilates was greater. In particular, post-heading photosynthate content of NERICA 1 was strongly affected by the variation in water management in comparison with that of other varieties. The decrease in crop growth rate during ripening in NERICA 1 can be mainly attributed to the lower post-heading photosynthate content. Thus, the ability of NERICA 1 to assimilate carbon after heading was considered to be potentially low, which has to be improved to achieve higher yield.

DOI： 10.1080/1343943X.2018.1561195

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Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Breeding  

<p>A total of 47 rice accessions collected from Kenya were investigated the genetic variations and classified into two cluster groups, A and B, by polymorphism data of 65 simple sequence repeat (SSR) markers. Clusters A and B corresponded to Japonica and Indica Groups, respectively. The number of Japonica Group accessions was limited in comparison with those of the Indica Group. Based on their patterns of reaction to standard differential blast isolates (SDBIs), these accessions and 57 control cultivars including differential varieties and several accessions harboring partial resistance genes were classified again into three cluster groups: Ia (high resistance), Ib (intermediate resistance) and II (susceptible). The rice accessions from Kenya were classified only into groups Ia and Ib. The accessions from Kenya were finally classified into three categories, A-Ia, B-Ia and B-Ib, based on the two classifications of polymorphism of SSR markers and resistance. The Indica Group accessions had wider genetic variation for blast resistance than did the Japonica Group accessions. The three leading cultivars (Basmati 217, Basmati 370 and ITA 310) categorized into Cluster group Ia were susceptible to some SDBIs from Kenya. The genetic variation for blast resistance in Kenya was demonstrated as the first report using SDBIs.</p>

DOI： 10.1270/jsbbs.19065

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society of Breeding  

<p>Problems with carbon assimilate translocation from source organs to sink (grains) during ripening cause yield losses in rice (<i>Oryza sativa</i> L.), especially in high-sink-capacity varieties. We conducted a genetic analysis of traits related to such translocation by using recombinant inbred lines. Shoot weight (SW) of T65, a <i>japonica</i> parent, was retained from heading to late maturity, whereas that of DV85, an <i>aus</i> parent, was greater than that of T65 at 5 days after heading (DAH) and then decreased until 20 DAH. This difference was observed clearly under standard-fertilizer but not low-fertilizer conditions. Non-structural carbohydrate (NSC) contents in the parents showed a tendency similar to that for SW. QTL analysis revealed pleiotropic QTLs on chromosomes 5 and 10, probably by associations with heading date QTLs. A QTL associated with harvest index and NSC at 5 DAH was detected on chromosome 1. By considering the temporal changes of the traits, we found a QTL for decrease in SW on chromosome 11; the DV85 allele of this QTL facilitated assimilate translocation and suppressed biomass growth. A suggestive QTL for NSC decrease was located on chromosome 2. These QTLs could represent potential targets for controlling carbon assimilate translocation in breeding programs.</p>

DOI： 10.1270/jsbbs.18203

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.5539/jas.v11n6p1

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：International Center for Research and Education in Agriculture, Nagoya University  

<p>Drought is one of the most serious abiotic stresses for rice cultivation, even under a water saving production system such as the Alternate Wetting and Drying (AWD) system and upland irrigated fields. In this study, we evaluated the performance of larger root systems in a KM07 mutant under such water management conditions. This mutant line was utilized for breeding and development of new rice germplasm adaptable to drought stress conditions in Mwea, Kenya, by crossing it with the recurrent parent of New Rice for Africa (NERICA), WAB56-104. Three mutant-type F6 lines grown under AWD and upland irrigated conditions showed different responses to drought stress. The mutant type’s greater root growth was observed in lines 2 and 3 under AWD and upland irrigation conditions, respectively. These results suggest that the highly developed root system derived from the KM07 mutant can avoid drought stress under field conditions in Kenya, and it should be utilized as breeding material for drought stress avoidance, along with water management technology.</p>

DOI： 10.50907/jicad.17.0_34

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

Photosynthetic performance of sago palm (Metroxylon sagu Rottb.) was evaluated in normal and waterlogged conditions. Net assimilation rate (AN), light response curve of net assimilation rate (AN/I) and pulse-amplitude modulation fluorescence vs. irradiance (PAM/I), leaf water potential, leaf chlorophyll content and leaflet area were measured. AN was higher in a particular period of waterlogging than in the normal condition. However, prolonged waterlogging (more than two months) negatively affected sago palm photosynthetic capacity. This was indicated by reduction in several photosynthetic parameters such as AN, maximum value of AN obtained at maximum irradiance (AN (Imax)), quantum yield at zero to 200 µmol m−2 s−1 irradiance (ϕ(Io_I200)), asymptotic photosynthetic efficiency (αo), and maximum electron transport rate (ETRmax). The plants experiencing waterlogging produced high qNmax and NPQmax values. Prolonged waterlogging period also caused significant reduction in leaf water potential (ψleaf) and photosynthetic pigments content. Normal soil conditions with a sufficient amount of water are preferable in order for the plant to generate higher photosynthetic capacity and facilitate stable sago production.

DOI： 10.1016/j.jssas.2018.05.004

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：MDPI  

Photosynthetic activities of the sago palm (Metroxylon sagu Rottb.) were studied to find out its sensitivity to changes in ambient air temperature. The minimum ambient air temperature designed for the experiment was 25-29 degrees C, while the higher end was 29-33 degrees C. Several photosynthetic parameters were studied to support our analysis in sago photosynthetic activity, including diurnal leaf gas exchange, assimilation rate vs. CO2 concentration, leaf greenness, leaf chlorophyll content, and photosynthetic rate vs. irradiance. We found that sago palm photosynthetic activity tends to be more sensitive to minimum than to maximum ambient air temperature. The plants exposed to higher air temperatures had dark green leaf color associated with higher rates of diurnal photosynthesis, chlorophyll content, and rubisco limited photosynthetic activity. They also exhibited higher trend in optimum irradiance absorption level. Consequently, maximum light energy dissipation occurred at higher temperatures.

DOI： 10.3390/agriculture8010004

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：TAYLOR & FRANCIS LTD  

Tropical highland conditions in Mwea Kenya, ensure the high radiation and the large day-night temperature differences. Such conditions are generally believed to promote rice growth and yield, but the current grain yield is lower than the expectation. In the current standard N fertilizer practice in Mwea, 75 kg nitrogen (N) ha(-1) is applied in three splits at fixed timing. The effects of increases in N fertilizer amount (125, 175, and 225 kg N ha(-1)) on rice growth and yield were evaluated to test the hypothesis that unachieved high rice grain yield in Mwea is due to insufficient amount of N fertilizer. Two popular lowland varieties in Mwea (Basmati 370 and BW196) and two varieties reported as high yielding in other countries (Takanari and IR72) were used. Shoot dry weight (DW) increased with increases in the amount of N fertilizer applied in three splits at fixed timing, irrespective of variety. It reached approximately 20 t ha(-1) under increased N conditions (>75 kg N ha(-1)) in several cases, indicating that high biomass production could be achieved by increasing N application rate. However, the increased biomass did not increase grain yield, due to decreased grain filling under high N conditions in all varieties. Thus, N amounts above 75 kg ha(-1) were ineffective for increasing grain yields in Mwea, where N fertilizer was applied in three splits at fixed timing. Increasing influence of low temperature under high N conditions may be one of the reasons for the decreased grain filling in Mwea.

DOI： 10.1080/1343943X.2018.1436000

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In rainfed lowland rice ecosystem, rice plants are often exposed to alternating recurrences of waterlogging and drought due to erratic rainfall. Such soil moisture fluctuation (SMF) which is completely different from simple or progressive drought could be stressful for plant growth, thereby causing reduction in yield. Root plasticity is one of the key traits that play important roles for plant adaptation under such conditions. This study aimed to evaluate root plasticity expression and its functional roles in dry matter production and yield under SMF using Nipponbare, KDML 105 and three backcross inbred lines (BILs) and to identify QTL(s) associated with root traits in response to SMF at two growth stages using Nipponbare/KDML105 F-2 plants. A BIL, G3-3 showed higher shoot dry matter production and yield than Nipponbare due to its greater ability to maintain stomatal conductance concomitant with greater root system development caused by promoted production of nodal and lateral roots under SMF. QTLs were identified for total nodal root length, total lateral root length, total root length, number of nodal roots, and branching index under SMF at vegetative and reproductive stages. The QTLs detected at vegetative and reproductive stages were different. We discuss here that relationship between root system of G3-3 and the detected QTLs. Therefore, G3-3 and the identified QTLs could be useful genetic materials in breeding program for improving the adaptation of rice plants in target rainfed lowland areas.

DOI： 10.1080/1343943X.2018.1446759

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Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japanese Society for Tropical Agriculture  

<p>This study examined how slope-related soil physicochemical properties affect the growth and yield of upland rice subjected to slash-and-burn. The yield survey and soil analysis were performed at a hillside farm in Southeast Sulawesi Province, Indonesia. Organic-C, total-N, available-P and exchangeable-Ca, Mg, and K tended to increase further down the slope, leading to greater rice growth and yield. The resultant yield increase was mainly attributable to higher spikelet number per square meter. Total-N explained variation in spikelet number per panicle, but not variation in grain yield. Among the tested soil physicochemical parameters, only organic-C was significantly and positively correlated with rice growth and yield. In addition, most other parameters increased with soil organic-C. These findings indicate that organic-C in the soil is important to the growth and yield of upland rice cultivated with slash-and-burn systems, although other complex relationships may exist between rice productivity, the environment, and agricultural management factors. Moreover, our results imply that position on a slope affect rice growth and yield.</p>

DOI： 10.11248/jsta.62.60

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：TAYLOR & FRANCIS LTD  

In Africa, cold temperatures occur in the highlands of East and Southern Africa and in some areas of the Sahel region of West Africa leading to substantial rice yield losses. Cold tolerance (CT) at booting stage on basis of spikelet fertility after cold water irrigation was evaluated using F-2 population derived from a cross between temperate japonica, Hananomai, and tropical japonica, WAB56-104. Two Quantitative trait loci (QTLs) for CT were detected on chromosome 8 and 10 with enhanced effects on the trait coming from Hananomai and WAB56-104 allele, respectively. The QTLs explained 30% and 33% of phenotypic variation in spikelet fertility, respectively. CT was negatively correlated with panicle number (r = -0.35, p < 0.01) and positively correlated with panicle weight (r = 0.61, p < 0.001). Selected BC1F4 and BC1F5 genotypes having homozygous alleles for both CT QTLs exhibited higher spikelet fertility under cold stress. The identified QTLs will be useful in the development of cold-tolerant varieties for production in high altitude areas through marker-assisted selection.

DOI： 10.1080/1343943X.2018.1440970

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DOI： 10.5539/jas.v9n6p49

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：TAYLOR & FRANCIS LTD  

This study aimed to investigate the possible causes for inconsistent performances of upland New Rice for Africa (NERICA) varieties in uplands and lowlands, while identifying important determinants in grain yield under deficient soil moisture. We compared the growth and yield of NERICA 1 and NERICA 5 to those of Yumenohatamochi, a Japanese upland variety, and Hinohikari, a Japanese lowland variety, subjected to different water management regimes (continually flooded, supplementary irrigation, and non-irrigation). Under conditions of deficient soil moisture, panicle number per square meter, spikelet number per panicle, and 1000-grain weight of NERICAs decreased, whereas the panicle number of the Japanese varieties experienced little change. In contrast, the grain filling ratio was unaffected by water management, irrespective of variety. The primary source of yield reduction under low soil water conditions was a decrease in spikelet number per panicle, and water stress intensity was the primary factor for the degree of this reduction. Variation in the abortion of secondary rachis-branches caused differences between NERICAs in their spikelet number response to soil moisture deficiency. The inconsistency in NERICA performance across uplands vs. lowlands can be partially attributed to variation in yield response to low soil water conditions. Moreover, water stress intensity and the presence of a water gradient along the vertical soil profile may combine to affect the fluctuation in NERICA performance under upland conditions.

DOI： 10.1080/1343943X.2016.1245102

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：International Center for Research and Education in Agriculture, Nagoya University  

<p>Cold stress is a major abiotic factor limiting rice production by reducing spikelet fertility. Under field conditions, cold stress varies with years and seasons in terms of its intensity, duration, and timing of occurrence. To reduce the risk of cold damage because of its unpredictable nature, crop adaptation strategies, such as management practices, that complement breeding are required. Flowering time (heading time) is a key trait that can be used to adapt rice to changing climatic conditions. Therefore, we screened a rice mutant line (T6-16) that has very shallow root system and exhibits delayed heading time under moderate drought stress conditions. This mutant line was used in breeding and development of a new cultivation technology for cold stress escape by introgression of its genetic segments into the background of a recurrent parent of New Rice for Africa (NERICA), WAB56-104. The mutant-type F2 plants grown under moderate drought stress conditions showed delayed heading by an average of 11 days. Three F2 plants that showed delay of heading by 11−17 days and maintained over 95% grain weight under the stress conditions were identified. These F2 plants could be useful in breeding for cold stress escape. These results suggest that the utilization of rice plants introgressed with the mutation gene and proper water management practices for rice cultivation based on the predicted length of cold periods could escape the cold stress through delaying heading time.</p>

DOI： 10.50907/jicad.15.0_32

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DOI： 10.11248/jsta.60.162

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DOI： 10.5539/jas.v8n8p136

Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1080/1343943X.2016.1146908

Language：Japanese   Publishing type：Research paper (scientific journal)  

Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： doi:10.1111/jac.12125

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1186/2193-1801-2-308

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11248/nettai.6.33

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11248/jsta1957.47.222

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.11248/jsta1957.45.259

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.11248/jsta1957.45.192

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1626/jcs.70.71

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1626/jcs.70.78

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1626/pps.3.328

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.11248/jsta1957.43.285

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.1626/jcs.68.487

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.24536/cssjchugoku.34.0_1

Total pages：212   Responsible for pages：27-47   Language：English Book type：Textbook, survey, introduction

DOI： 10.1007/978-981-10-7308-3_3

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Total pages：249   Language：Japanese Book type：Textbook, survey, introduction

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Responsible for pages：84-109   Language：Japanese Book type：Scholarly book

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Article, review, commentary, editorial, etc. (international conference proceedings)  

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)  

Event date： 2024.11

Language：English   Presentation type：Poster presentation  

Venue：Tokyo University of Agriculture, Tokyo, Japan   Country：Japan  

Event date： 2023.10

Language：English   Presentation type：Poster presentation  

Venue：Philippine International Convention Center, Manila   Country：Philippines  

Event date： 2023.10

Language：English   Presentation type：Poster presentation  

Venue：Philippine International Convention Center, Manila   Country：Philippines  

Event date： 2023.10

Language：English   Presentation type：Poster presentation  

Venue：Philippine International Convention Center, Manila   Country：Philippines  

Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：静岡大学, 静岡市   Country：Japan  

Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：静岡大学, 静岡市   Country：Japan  

Event date： 2023.3

Language：English   Presentation type：Poster presentation  

Venue：University College Dublin, Dublin   Country：Ireland  

Event date： 2022.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2022.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：愛知県農業総合試験場, 長久手市   Country：Japan  

Event date： 2022.9

Language：Japanese   Presentation type：Oral presentation (general)  

DOI： 10.14829/jcsproc.254.0_35

CiNii Research

Event date： 2022.9

Language：Japanese   Presentation type：Oral presentation (general)  

DOI： 10.14829/jcsproc.254.0_43

CiNii Research

Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

DOI： 10.14829/jcsproc.252.0_26

Event date： 2021.9

Language：English   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2021.9

Language：English   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2021.3

Language：English   Presentation type：Oral presentation (general)  

Venue：Online   Country：Japan  

DOI： 10.14829/jcsproc.251.0_166

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Event date： 2021.2

Language：English   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Country：Egypt  

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Event date： 2020.3

Language：English   Presentation type：Poster presentation  

Country：Japan  

DOI： 10.14829/jcsproc.249.0_177

Event date： 2020.3

Language：Japanese   Presentation type：Poster presentation  

Venue：東京農工大学, 府中市   Country：Japan  

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Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

DOI： 10.14829/jcsproc.248.0_11

Event date： 2019.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

DOI： 10.14829/jcsproc.248.0_12

Event date： 2019.9

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

DOI： 10.14829/jcsproc.248.0_131

Event date： 2019.9

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

DOI： 10.14829/jcsproc.248.0_99

Event date： 2019.9

Language：English   Presentation type：Poster presentation  

Country：Japan  

DOI： 10.14829/jcsproc.248.0_141

Event date： 2019.3

Language：English   Presentation type：Poster presentation  

Country：Japan  

DOI： 10.14829/jcsproc.247.0_110

Event date： 2019.3

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

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Event date： 2018.12

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Bujumbura, Burundi   Country：Burundi  

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Event date： 2018.10

Language：Japanese   Presentation type：Poster presentation  

Venue：盛岡市   Country：Japan  

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Event date： 2018.10

Language：English   Presentation type：Poster presentation  

Venue：Marina Bay Sands, Singapore   Country：Singapore  

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Event date： 2018.10

Language：English   Presentation type：Poster presentation  

Venue：Marina Bay Sands, Singapore   Country：Singapore  

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Event date： 2018.9

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2018.9

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

DOI： 10.14829/jcsproc.246.0_110

Event date： 2018.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

DOI： 10.14829/jcsproc.246.0_54

Event date： 2018.8

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：日本大学、藤沢市   Country：Japan  

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Event date： 2018.3

Language：English   Presentation type：Poster presentation  

Country：Japan  

DOI： 10.14829/jcsproc.245.0_199

Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：宇都宮大学、宇都宮   Country：Japan  

DOI： 10.14829/jcsproc.245.0_209

Event date： 2017.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：橿原観光ホテル、奈良市   Country：Japan  

DOI： 10.20710/dohikouen.64.0_282_3

Event date： 2017.12

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2017.12

Language：Japanese   Presentation type：Poster presentation  

Venue：静岡大学, 静岡市   Country：Japan  

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Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

DOI： 10.14829/jcsproc.244.0_39

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東北大学、仙台市   Country：Japan  

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岩手大学、盛岡市   Country：Japan  

Event date： 2017.9

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

DOI： 10.14829/jcsproc.244.0_104

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

DOI： 10.14829/jcsproc.244.0_38

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岩手大学、盛岡市   Country：Japan  

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Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東北大学、仙台市   Country：Japan  

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Event date： 2017.6

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2017.6

Language：English   Presentation type：Poster presentation  

Venue：Jeju Convention Center, Jeju, South Korea   Country：Korea, Republic of  

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Event date： 2017.6

Language：English   Presentation type：Poster presentation  

Venue：Jeju Convention Center, Jeju, South Korea   Country：Korea, Republic of  

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Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：University of Tokyo, Tokyo, Japan   Country：Japan  

Event date： 2017.3

Language：English   Presentation type：Poster presentation  

Venue：University of Tokyo, Tokyo, Japan   Country：Japan  

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Event date： 2017.3

Language：Japanese   Presentation type：Poster presentation  

Venue：名古屋大学、名古屋   Country：Japan  

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Event date： 2017.3

Language：Japanese   Presentation type：Poster presentation  

Venue：University of Tokyo, Tokyo, Japan   Country：Japan  

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Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：University of Tokyo, Tokyo, Japan   Country：Japan  

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Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：University of Tokyo, Tokyo, Japan   Country：Japan  

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Event date： 2017.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：University of Tokyo, Tokyo, Japan   Country：Japan  

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Event date： 2017.3

Language：Japanese   Presentation type：Poster presentation  

Venue：University of Tokyo, Tokyo, Japan   Country：Japan  

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Event date： 2017.3

Language：English   Presentation type：Poster presentation  

Venue：Nihon University, Fujisawa, Japan   Country：Japan  

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Event date： 2017.2

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：岡山大学資源植物科学研究所, 倉敷市   Country：Japan  

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Event date： 2017

Language：Japanese   Presentation type：Poster presentation  

Venue：富山大学、富山   Country：Japan  

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Event date： 2016.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：メルパルク京都、京都市   Country：Japan  

DOI： 10.20710/dohikouen.63.0_311_2

Event date： 2016.12

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

DOI： 10.20710/dohikouen.63.0_311_1

Event date： 2016.12

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Nairobi, Kenya   Country：Kenya  

Event date： 2016.12

Language：English   Presentation type：Poster presentation  

Venue：Nairobi, Kenya   Country：Kenya  

Event date： 2016.12

Language：English   Presentation type：Poster presentation  

Venue：Nairobi, Kenya   Country：Kenya  

Event date： 2016.12

Language：English   Presentation type：Poster presentation  

Venue：Nairobi, Kenya   Country：Kenya  

Event date： 2016.12

Language：English   Presentation type：Poster presentation  

Venue：Nairobi, Kenya   Country：Kenya  

Event date： 2016.12

Language：English   Presentation type：Poster presentation  

Venue：Nairobi, Kenya   Country：Kenya  

Event date： 2016.12

Language：English   Presentation type：Poster presentation  

Venue：Nairobi, Kenya   Country：Kenya  

Event date： 2016.12

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Nairobi, Kenya   Country：Kenya  

Event date： 2016.12

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Nairobi, Kenya   Country：Kenya  

Event date： 2016.12

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Nairobi, Kenya   Country：Kenya  

Event date： 2016.12

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Nairobi, Kenya   Country：Kenya  

Event date： 2016.12

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Nairobi, Kenya   Country：Kenya  

Event date： 2016.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2016.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Kagoshima University, Kagoshima, Japan   Country：Japan  

Event date： 2016.9 - 2016.10

Language：English   Presentation type：Poster presentation  

Venue：Okayama University, Kurashiki, Japan   Country：Japan  

Event date： 2016.9

Language：Japanese   Presentation type：Poster presentation  

Venue：佐賀大学, 佐賀市   Country：Japan  

Event date： 2016.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue： Ibaraki University, Mito, Japan   Country：Japan  

Event date： 2016.3

Language：English   Presentation type：Oral presentation (invited, special)  

Venue：Ibaraki University, Mito, Japan   Country：Japan  

Event date： 2016.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2016.3

Language：English   Presentation type：Poster presentation  

Venue：Ibaraki University, Mito, Japan   Country：Japan  

Event date： 2016.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Ibaraki University, Mito, Japan   Country：Japan  

Event date： 2016.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Meiji University, Kawasaki, Japan   Country：Japan  

Event date： 2016.3

Language：English   Presentation type：Poster presentation  

Venue：Meiji University, Kawasaki, Japan   Country：Japan  

Event date： 2015.11

Language：English   Presentation type：Poster presentation  

Venue：Tokyo University of Agriculture, Tokyo, Japan   Country：Japan  

Event date： 2015.11

Language：English   Presentation type：Poster presentation  

Venue：Tokyo University of Agriculture, Tokyo, Japan   Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都大学, 京都市   Country：Japan  

Event date： 2015.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Kyoto University, Kyoto, Japan   Country：Japan  

Event date： 2015.9

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2015.9

Language：English   Presentation type：Poster presentation  

Venue：Shinshu University, Nagano, Japan   Country：Japan  

Event date： 2015.8

Language：English   Presentation type：Poster presentation  

Venue：Nagoya University, Nagoya, Japan   Country：Japan  

Event date： 2015.3

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2015.3

Language：Japanese   Presentation type：Poster presentation  

Venue：東京都町田市   Country：Japan  

Event date： 2015.3

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2015.3

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2014.11

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2014.10

Language：English   Presentation type：Poster presentation  

Venue：Bangkok, Thailand   Country：Thailand  

Event date： 2014.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Bangkok, Thailand   Country：Thailand  

Event date： 2014.10

Language：English   Presentation type：Poster presentation  

Venue：Bangkok, Thailand   Country：Thailand  

Event date： 2014.9

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2014.9

Language：English   Presentation type：Poster presentation  

Venue：名古屋大学, 名古屋市   Country：Japan  

Event date： 2014.9

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2014.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：千葉大学, 千葉市   Country：Japan  

Event date： 2014.3

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2014.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2014.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2013.11

Language：Japanese   Presentation type：Poster presentation  

Venue： 信州大学   Country：Japan  

Event date： 2013.11

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2013.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岩手大学農学部, 盛岡市   Country：Japan  

Event date： 2013.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2013.10

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2013.3

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Country：Japan  

Event date： 2013.3

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Country：Japan  

Event date： 2013.3

Language：English   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2013.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.12

Language：Chinese   Presentation type：Oral presentation (general)  

Venue：新潟大学、新潟市   Country：Japan  

Event date： 2012.10

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.10

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

Country：Japan  

Event date： 2012.10

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：Nagoya, Japan   Country：Japan  

Event date： 2012.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.9

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2012.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Bento Gonçalves, Brazil   Country：Brazil  

Event date： 2012.5

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.3

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Country：Japan  

Event date： 2012.3

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2012.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2012.2

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Venue：Noyori Conference Hall, Nagoya University, Nagoya, Japan   Country：Japan  

Event date： 2012.2

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Venue：Noyori Conference Hall, Nagoya University, Nagoya, Japan   Country：Japan  

Event date： 2012.2

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Venue：Noyori Conference Hall, Nagoya University, Nagoya, Japan   Country：Japan  

Event date： 2012.2

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Venue：Noyori Conference Hall, Nagoya University, Nagoya, Japan   Country：Japan  

Event date： 2012.2

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Venue：Noyori Conference Hall, Nagoya University, Nagoya, Japan   Country：Japan  

Event date： 2012.2

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Venue：Noyori Conference Hall, Nagoya University, Nagoya, Japan   Country：Japan  

Event date： 2012.2

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Venue：Noyori Conference Hall, Nagoya University, Nagoya, Japan   Country：Japan  

Event date： 2011.10

Language：English   Presentation type：Oral presentation (general)  

Venue：San Antonio, TX, USA   Country：United States  

Event date： 2011.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Taipei International Convention Center, Taipei   Country：Taiwan, Province of China  

Event date： 2011.9

Language：English   Presentation type：Oral presentation (general)  

Venue：IPB International Convention Center, Bogor, Indonesia   Country：Indonesia  

Event date： 2011.9

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2011.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Philrice, Philippines   Country：Philippines  

Event date： 2011.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2011.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都大学百周年時計台記念館・地球環境学堂, 京都市   Country：Japan  

Event date： 2011.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2011.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2010.11

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Venue：African Institutefor Capacity Development, Juja, Kenya   Country：Kenya  

Event date： 2010.11

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Venue：African Institutefor Capacity Development, Juja, Kenya   Country：Kenya  

Event date： 2010.11

Language：English   Presentation type：Symposium, workshop panel (nominated)  

Venue：African Institutefor Capacity Development, Juja, Kenya   Country：Kenya  

Event date： 2010.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Juja, Kenya   Country：Kenya  

Event date： 2010.11

Language：English   Presentation type：Oral presentation (general)  

Venue：Juja, Kenya   Country：Kenya  

Event date： 2010.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：Ginowan, Japan   Country：Japan  

Event date： 2010.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Ginowan, Japan   Country：Japan  

Event date： 2010.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Tofino, Canada   Country：Canada  

Event date： 2010.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2010.3

Language：English   Presentation type：Oral presentation (general)  

Venue：Matsudo, Japan   Country：Japan  

Event date： 2010.3

Language：English   Presentation type：Oral presentation (general)  

Venue：Matsudo, Japan   Country：Japan  

Event date： 2010.3

Language：English   Presentation type：Oral presentation (general)  

Venue：Matsudo, Japan   Country：Japan  

Event date： 2009.11

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

Venue：名古屋大学野依記念学術交流館, 名古屋市   Country：Japan  

Event date： 2009.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.10

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2008.10

Language：Japanese   Presentation type：Symposium, workshop panel (nominated)  

Venue：名古屋大学環境学研究科レクチャーホール, 名古屋市   Country：Japan  

Event date： 2008.6

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2008.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Cusco, Peru   Country：Peru  

Event date： 2006.11

Language：English   Presentation type：Poster presentation  

Venue：Kampala, Uganda   Country：Uganda  

Event date： 2006.3

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2000.4

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 1999.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 1999.7

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山大学, 岡山市   Country：Japan  

Event date： 1999.4

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 1998.4

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 1998.4

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 1996.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 1996.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Indianapolis   Country：United States  

Event date： 1993.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

途上国が今日直面している食料不足，低い農業生産性，農業環境悪化など，農学領域の諸問題を実践的に解決しうる人材を育成するうえで不可欠な人づくり国際協力を，南北間，南南間で効果的に進めるための国内外の人的協カネットワーク開発の方法論について考究する。