研究者詳細 - 江原　宏

論文 - 江原　宏

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Identification of differentially expressed transcripts for trunk formation in sago palm using annealing control primer GeneFishing technique 査読有り

Hussain H., Edward-Atit A.S., Julaihi N., Tommy R., Nisar M., Hamdan N., Ehara H.

Journal of Applied Biology and Biotechnology 10 巻 ( 2 ) 頁： 21 - 34 2022年2月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Applied Biology and Biotechnology

In the state of Sarawak, Malaysia’s vast peatland cultivated with sago palm (Metroxylon sagu), a considerable amount of cases involving stunted, nondeveloped trunk of sago palms was observed. Molecular-level understanding of the mechanism or pathway involved in the trunking (T) process leading to storage starch accumulation in the trunk of the sago palm is yet to be fully understood. A Polymerase Chain Reaction-based differential display analysis using Annealing Control Primer based GeneFishing technique on leaf samples of normal T compared to the nontrunking (NT) palm showed distinct differentially expressed transcripts pattern with differences in intensity between 35% and 123%. The translated sequence identified functions that are grouped under energy metabolism, nutrient regulation, biosynthetic reactions, defense mechanism, and stress tolerance. Transcripts from T showed higher expression of redox-regulating functions, while NT samples had proteins actively involved in the respiratory chain and chloroplast regulation. In nutrient regulation, the T sample showed higher transcript levels of nitrogen utilization and regulation of phosphate and cobalt, whereas NT showed activities of nitrogen uptake and regulation of calcium, magnesium, and zinc. This study identified different levels of transcripts in two physiologically different sago palms, and the formation and the development of the trunk are induced by these enzymes.

DOI： 10.7324/jabb.2022.100204

Scopus

Effect of chicken manure and chemical fertilizer on the yield and qualities of white mugwort at dissimilar harvesting times 査読有り

Thepsilvisut, O; Chutimanukul, P; Sae-Tan, S; Ehara, H

PLOS ONE 17 巻 ( 4 ) 頁： e0266190 - e0266190 2022年

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PLoS ONE

One of the key components that affects soil productiveness, plant growth, and crop quality is fertilization. The effect of fertilizer, both organic and chemical, on the extremely acidic (pH 4.10) sandy loam soil chemical properties, yield, and quality of white mugwort grown were evaluated in this study. The field experiment arranged in a randomized complete block design, with four replications was conducted in Prachin Buri province, Thailand. There were six treatments, no fertilization (control), chemical fertilizer (25-7-7 + 46-0-0) applied at 187.50 (66.56 N:6.77 P2O5:6.77 K2O kg ha-1) kg ha-1 and applied at 375.00 (133.12 N:13.13 P2O5:13.13 K2O kg ha-1) kg ha-1, chicken manure applied at 3.36, 6.72, and 10.08 t ha-1. After harvesting, application of chicken manure tended to increase soil organic matter compared to the control, however, the application of chemical fertilizer did not show the same effect. The fresh weight of white mugwort increased with the rise in both fertilizer levels. Chicken manure application at 10.08 t ha-1 produced the highest fresh weight at all times. The level of accumulated nitrate was significantly greater when fertilizer rates increased. In addition, the total phenolic content of the white mugwort fertilized with chicken manure was higher than that fertilized with chemical fertilizer. However, there was no association between the DPPH radical scavenging capacity at harvesting times and different fertilization. Based on the results, chicken manure applied at 10.08 t ha-1 gave the best yield and higher total phenolic content of white mugwort, which was probably due to the improved soil organic matter.

DOI： 10.1371/journal.pone.0266190

Web of Science

Scopus

PubMed

Detection of Suitable Wetlands for Paddy Field Harvesting of Taro (Colocasia esculenta) to Minimize Damage Caused by Taro Beetles (Papuana uniondis) on Gau Island, Fiji

MIYAMOTO Kana, ITAYA Akemi, NAKASHIMA Chiharu, MISHIMA Takashi, TOKUDA Hiromi, YOSHIMATSU Takao, EHARA Hiroshi

Tropical Agriculture and Development 66 巻 ( 2 ) 頁： 64 - 72 2022年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Japanese Society for Tropical Agriculture

Taro beetle damage has recently been reported on Gau Island, Fiji, causing economic loss for the taro business. This significantly reduced farmers’ incomes and the cultural value of taro. Swamp taro cultivation is expected to be a solution to taro beetle damage. Even though studies investigating the mitigation of taro beetle damage in paddy fields are not common, taro beetles do not have the ability to go beyond a certain depth in muddy condition. This study investigated suitable wetlands for taro cultivation by using the topographic wetness index (TWI). The calculation also considered protection forest zones and accessibility as analyzed by RapidEye satellite images, normalized difference vegetation index (NDVI), and buffer function. Results showed that 26.03% of the island’s mass has potential for the development of paddy fields. Although the result was larger than predicted, there are differences between potential areas for each village. However, these areas were more than double size of the existing farmland of each village. Estimated yields corresponding to the potential areas were also presented in the study; these indicated that more than half of villages might be able to yield more than 0.50 t of taro production.

DOI： 10.11248/jsta.66.64

CiNii Research

Comparison of growth and ion absorption with compatible solute accumulation of three wild Vigna species under salt stress 査読有り

Yoshida, J., Tomooka, N., Mishima, T., Matsuda, Y. and Ehara, H.

Tropical Agriculture and Development 65 巻 ( 4 ) 頁： 194 - 205 2021年12月

Arbuscular mycorrhizal communities in the roots of sago palm in mineral and shallow peat soils 査読有り国際共著国際誌

Asano, K., Kagong, W. V. A., Mohammad, S. M. B., Sakazaki, K., Talip, M. S. B. H. A., Sahmat, S. S., Yok, M. C. K., Isoi, T., Nakata-Kano, M. and Ehara, H.

Agriculture 11 巻 ( 11 ) 2021年12月

Response and resilience of Asian agrifood systems to COVID-19: An assessment across twenty-five countries and four regional farming and food systems 査読有り国際共著国際誌

Dixon, JM; Weerahewa, J; Hellin, J; Rola-Rubzen, MF; Huang, JK; Kumar, S; Das, A; Qureshi, ME; Krupnik, TJ; Shideed, K; Jat, ML; Prasad, PVV; Yadav, S; Irshad, A; Asanaliev, A; Abugalieva, A; Karimov, A; Bhattarai, B; Balgos, CQ; Benu, F; Ehara, H; Pant, J; Sarmiento, JMP; Newby, JC; Pretty, J; Tokuda, H; Weyerhaeuser, H; Digal, LN; Li, LL; Sarkar, MAR; Abedin, MZ; Schreinemachers, P; Grafton, Q; Sharma, RC; Saidzoda, S; Lopez-Ridaura, S; Coffey, S; Kam, SP; Win, SS; Praneetvatakul, S; Maraseni, T; Touch, V; Liang, WL; Saharawat, YS; Timsina, J

AGRICULTURAL SYSTEMS 193 巻頁： 103168 - 103168 2021年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Agricultural Systems

Context: The COVID-19 pandemic has been affecting health and economies across the world, although the nature of direct and indirect effects on Asian agrifood systems and food security has not yet been well understood. Objectives: This paper assesses the initial responses of major farming and food systems to COVID-19 in 25 Asian countries, and considers the implications for resilience, food and nutrition security and recovery policies by the governments. Methods: A conceptual systems model was specified including key pathways linking the direct and indirect effects of COVID-19 to the resilience and performance of the four principal Asian farming and food systems, viz, lowland rice based; irrigated wheat based; hill mixed; and dryland mixed systems. Based on this framework, a systematic survey of 2504 key informants (4% policy makers, 6% researchers or University staff, 6% extension workers, 65% farmers, and 19% others) in 20 Asian countries was conducted and the results assessed and analysed. Results and conclusion: The principal Asian farming and food systems were moderately resilient to COVID-19, reinforced by government policies in many countries that prioritized food availability and affordability. Rural livelihoods and food security were affected primarily because of disruptions to local labour markets (especially for off-farm work), farm produce markets (notably for perishable foods) and input supply chains (i.e., seeds and fertilisers). The overall effects on system performance were most severe in the irrigated wheat based system and least severe in the hill mixed system, associated in the latter case with greater resilience and diversification and less dependence on external inputs and long market chains. Farming and food systems' resilience and sustainability are critical considerations for recovery policies and programmes, especially in relation to economic performance that initially recovered more slowly than productivity, natural resources status and social capital. Overall, the resilience of Asian farming and food systems was strong because of inherent systems characteristics reinforced by public policies that prioritized staple food production and distribution as well as complementary welfare programmes. With the substantial risks to plant- and animal-sourced food supplies from future zoonoses and the institutional vulnerabilities revealed by COVID-19, efforts to improve resilience should be central to recovery programmes. Significance: This study was the first Asia-wide systems assessment of the effects of COVID-19 on agriculture and food systems, differentiating the effects of the pandemic across the four principal regional farming and food systems in the region.

DOI： 10.1016/j.agsy.2021.103168

Web of Science

Scopus

PubMed

Traditional knowledge of medicinal plants on Gau Island, Fiji: differences between sixteen villages with unique characteristics of cultural value 査読有り国際共著国際誌

Kana Miyamoto, Hiroshi Ehara, Randolph Thaman, Joeli Veitayaki, Takehito Yoshida, Hikaru Kobayashi

Journal of Ethnobiology and Ethnomedicine 頁： 17 - 58 2021年10月

Commercialization of sago starch in Indonesia: Production, consumption and international trading 査読有り国際共著国際誌

Marlisa Ayu Trisia, Hiroshi Ehara

Sago Palm 29 巻 ( 1 ) 頁： 39 - 47 2021年8月

Sago palm (Metroxylon sagu Rottb.) response to drought condition in terms of leaf gas exchange and chlorophyll a fluorescence 査読有り国際共著

Azhar, A; Makihara, D; Naito, H; Asano, K; Takagi, M; Unoki, S; Tomita, R; Abbas, B; Ehara, H

PLANT PRODUCTION SCIENCE 24 巻 ( 1 ) 頁： 65 - 72 2021年1月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Plant Production Science

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.

DOI： 10.1080/1343943X.2020.1794914

Web of Science

Scopus

The impact of different soil water levels on nitrogen, phosphorus, and potassium uptake, photosynthetic performance, and sugar distribution of sago palm seedlings 査読有り国際共著国際誌

Azhar, A; Audia, F; Asano, K; Makihara, D; Naito, H; Sugiura, D; Ehara, H

AGROSYSTEMS GEOSCIENCES & ENVIRONMENT 4 巻 ( 3 ) 2021年

The Role of the Sago Supply Chain for Rural Development in Indonesia: A Review and Perspective 査読有り国際共著国際誌

Marlisa Ayu Trisia , Masashi Tachikawa , Hiroshi Ehara

Reviews in Agricultural Science 2021年

Factors determining sago starch import demand: Empirical evidence from Japan 査読有り国際誌

Trisia M.A., Takeshita H., Kikuta M., Ehara H.

Journal of International Logistics and Trade 18 巻 ( 4 ) 頁： 159 - 167 2020年12月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of International Logistics and Trade

Sago starch (Metroxylon sagu Rottb.) is one of the starches imported into Japan. Recently, sago starch has been promoted as a healthy type of starch because it is gluten-free and non-allergenic. This study aims to identify the factors affecting sago starch import demand during the period 1978-2017 in Japan by using a double logarithmic linear function. The study revealed that the price of sago starch, GDP, aging population rate and tariff-rate quota policy are significant factors influencing sago starch importation in Japan.

DOI： 10.24006/jilt.2020.18.4.159

Scopus

From producers to consumers: An analysis of distribution channels and added value of sago products in East Java, Indonesia 査読有り

Trisia, M. A, Ehara, H

Sago Palm 28 巻 ( 2 ) 頁： 49 - 55 2020年12月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：The Japanese Societ of Sago Palm Studies

The distribution channel is vital in the sago business because it connects producers and consumers. In this paper, we identify the distribution channels of sago products and their functional classification. We found that the distribution of sago products, such as dried sago and roasted sago (sagu kotak), in East Java is classified as indirect distribution, which relies on intermediaries. Intermediaries such as distributors, wholesale agents, and retailers are primarily actors that directly coordinate buying, selling, storing, and distributing sago products from Riau and Maluku to consumers in East Java. In addition, our calculation showed that sago pudding has a highly profitable value-added process as compared to that of roasted sago.

DOI： 10.57418/sagopalm.28.2_49

CiNii Research

Potassium fertilizer under iron toxicity stress of ex-situ conditions and its effect to Fe content in the rice grain 査読有り国際共著

Saeka Unoki, Trias Sitaresmi, Hiroshi Ehara, Yudhistira Nugraha

Jurnal Penelitian Pertanian Tanaman Pangan 4 巻 ( 2 ) 頁： 81 - 81 2020年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Indonesian Agency For Agricultural Research and Development (IAARD)

Iron toxicity affects the growth and yield of rice plant. Overcoming the damage of rice production by iron toxicity requires furthermore researches from laboratory to field levels. Here, we study responses of rice genotypes to iron toxicity between vegetative stage in hydroponic and whole grow stages in the pot. The first experiment was hydroponic experiment using twelve rice genotypes which were growth in the Yoshida Solution with addition of 0.2 % of agar. Three level of iron was given at 0, 500 and 700 ppm. The second experiment was the pot experiment using alluvial soil added with 3.000 ppm of ferrous combine with four levels of potassium and the control on Cilamaya Muncul (tolerant), Inpara 8 (moderate tolerant) and IR 64 (susceptible). In hydroponic experiment, even though the symptom appeared obviously, the leaf bronzing score (LBS) of tolerant and sensitive genotypes were not different. Physiological traits were significantly affected by Fe treatment in all varieties. Then symptom and physiological traits were significantly correlated. Through the pot experiment, it was confirmed the tolerance of each varieties. However, we couldn’t see the correlation between the LBS on hydroponic and soil at this time. And the heading delay was new finding, but it depended on varieties. We also could see the possibility of potassium application to inhibit iron toxicity but still we need to explore how it works. Kata kunci: iron toxicity, rice, hydroponic, soil

DOI： 10.21082/jpptp.v4n2.2020.p81-88

Importance of phosphorus and potassium in soil-specific nutrient management for wet-season rice in Cambodia 査読有り国際共著国際誌

Kong, K; Hin, S; Seng, V; Ismail, AM; Vergara, G; Choi, IR; Ehara, H; Kato, Y

EXPERIMENTAL AGRICULTURE 56 巻 ( 2 ) 頁： 204 - 217 2020年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Experimental Agriculture

Rice is widely grown in rainfed lowlands during the wet season in the Mekong region. Limited nutrient availability is a common constraint on crop yield, and the optimal rate of fertilizer application depends on the soil type. The objective of our study was to evaluate rice productivity and the economic feasibility of various nutrient management regimes in Cambodia. We conducted field experiments on three soil types (Prey Khmer, Prateah Lang, and Toul Samroung, equivalent to Psamments, Plinthustalfs, and Endoaqualfs, respectively) in four provinces (Battambang, Kampong Thom, Pursat, and Siem Reap) during the 2016 and 2017 wet seasons to compare nine (2016) and seven (2017) N-P-K combinations. Grain yield ranged from 0.9 to 4.8 t ha-1 in 2016 and from 1.0 to 5.2 t ha-1 in 2017, depending on soil type and nutrient management. The Prey Khmer soil contained around 80% sand, and rice yield responded most weakly to nutrient management. The moderate fertilizer input in the current soil-specific recommendation was effective on this soil type. However, on more fertile soils with a higher clay content and a higher cation-exchange capacity (Toul Samroung and Prateah Lang), an additional 20 kg N ha-1 combined with adding 15 kg ha-1 of P2O5 or 20 kg ha-1 of K2O significantly increased yield and economic return. Although P and K use during Cambodia's wet season is uncommon, our results demonstrate the importance of these nutrients in improving the country's rice production.

DOI： 10.1017/S0014479719000309

Web of Science

Scopus

Potential yield and nutrient requirements of direct-seeded, dry-season rice in Cambodia 査読有り国際共著国際誌

Kong, K; Hin, S; Seng, V; Ismail, AM; Vergara, G; Choi, IR; Ehara, H; Kato, Y

EXPERIMENTAL AGRICULTURE 56 巻 ( 2 ) 頁： 255 - 264 2020年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Experimental Agriculture

The area of dry-season rice (Oryza sativa L.) has rapidly increased in Cambodia owing to the large-scale development of irrigation infrastructure. But little is known of potential productivity and adaptive crop management. The objective of our study was to evaluate potential yield and nutrient requirements of dry-season rice in Cambodia, and the economic feasibility of soil-specific management recommended by the government. Field experiments were conducted on four soil types (Bakan, equivalent to Alfisol; Krakor, Inceptisol; Prateah Lang, Plinthustalfs; and Toul Samroung, Endoaqualfs) in four provinces (Battambang, Kampong Thom, Pursat, and Siem Reap) during the 2016 and 2017 dry seasons to compare 14 (2016) and 8 (2017) N-P-K combinations. Grain yield ranged from 1.0 to 5.5 t ha-1 in 2016 and from 1.3 to 6.7 t ha-1 in 2017. Potential yield from the experiments was 6-7 t ha-1 on Toul Samroung soil, 5-6 t ha-1 on Bakan soil, and 3-5 t ha-1 on Prateah Lang and Krakor soils. A rate of 140-60-60 kg ha-1 of N-P2O5-K2O was more than enough to achieve the best yields on any soil group. On the other hand, modest application rates in soil-specific management (44-78 kg ha-1 of N, 23-28 kg ha-1 of P2O5, 0-30 kg ha-1 of K2O) proved reasonable for resource-poor farmers in Cambodia, since the treatment always provided >75 % of the highest economic profit in high-input plots.

DOI： 10.1017/S0014479719000346

Web of Science

Scopus

Unique responses of three highly salt-tolerant wild Vigna species against salt stress 査読有り国際共著国際誌

Yoshida, J; Tomooka, N; Khaing, TY; Shantha, PGS; Naito, H; Matsuda, Y; Ehara, H

PLANT PRODUCTION SCIENCE 23 巻 ( 1 ) 頁： 114 - 128 2020年1月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Plant Production Science

The genus Vigna contains important crops such as cowpea and mungbean. Wild Vigna showing higher salt tolerance than Vigna crops were screened and their tolerance mechanisms are discussed. Primary screening using 7 Vigna crops and 23 wild Vigna under 300 mM NaCl selected V. luteola, V. marina and V. vexillata. A study under different salt concentrations revealed the highest survival ability of V. marina. Diversity of salt tolerance in each species was revealed using a total of 230 accessions. Growth and physiological responses under 150 mM NaCl were then compared using two selected accessions from each species. The pattern of Na+ accumulation in roots, stems and leaves suggested that V. vexillata (V1) and V. luteola (L8, L9) are ‘Na+ excluder’ type, while V. marina (M1, M4) is ‘Na+ includer’ type. V. luteola (L8, L9) showed the highest dry matter production under control condition and well-maintained shoot dry weight under salt stress. Interestingly, V. luteola (L9) accumulated the highest Na+ in roots (3000 μM g−1) and increased root dry weight under salt stress, which might work as Na+ reservoir restricting Na+ transition to the leaves, leading to the increased photosynthetic rate. V. luteola has great potential in areas where moderate salt damage occurs. V. marina (M1, M4) accumulated Na+ at high level in roots, stem, and leaves. Under salt stress, they increased stomatal conductance, transpiration rate, and photosynthetic rate, which suggested the adaptational regulation of aquaporin gene expression. V. marina will be useful as food, pasture and phytoremediation legumes in highly salt-damaged areas.

DOI： 10.1080/1343943X.2019.1698968

Web of Science

Scopus

Evaluating sago palm (Metroxylon sagu Rottb.) photosynthetic performance in waterlogged conditions: utilizing pulse-amplitude-modulated (PAM) fluorometry as a waterlogging stress indicator 査読有り国際共著国際誌

Azhar A., Makihara D., Naito H., Ehara H.

Journal of the Saudi Society of Agricultural Sciences 19 巻 ( 1 ) 頁： 37 - 42 2020年

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of the Saudi Society of Agricultural Sciences

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

Scopus

Colonization of Roots in Sago Palm Seedlings Associated with Commercial Mycorrhizal Inocula 査読有り国際共著

Asano, K., Isoi, Y., Murano, H., Azhar, A., Pasolon, Y. B. and Ehara, H.

Sago Palm 27 巻 ( 1 ) 頁： 9-14 2020年

Agro-economic evaluation of fertilizer management for wet season rice in southern Cambodia 査読有り国際共著

Kong, K., Kato, Y., Men, S., Seng, V., Yamauchi, A., Kikuta, M., Choi, I-R. and Ehara, H.

Tropical Agriculture and Development 64 巻 ( 4 ) 頁： 210-218 2019年12月

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