研究者詳細 - 江原　宏

論文 - 江原　宏

分割表示 131 件中 21 - 40 件目／全件表示 >>

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

Colonization of Roots in Sago Palm Seedlings Associated with Commercial Mycorrhizal Inocula 査読有り

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

Sago Palm 27 巻 ( 1 ) 頁： 9 - 14 2019年10月

Phylogenetic Study of Metroxylon Palms in Southeast Asia and Oceania Based on 5S nrDNA Spacer Sequence Data 査読有り

Hiroshi Ehara, Toshiki Yamamoto, Tohru Tsuchiya, Hitoshi Naito, John, L. Dowe, Will C. McClatchey, Takashi Mishima, Akemi Itaya, Chitoshi Mizota, Yulius B. Pasolon, Philimon Ala, Marika Tuiwawa, Alivereti Naikatini, Issac A. Rounds, Talie Foliga, Siosinamele Lui, Samantha Kwan

SAGO PALM 26 巻 ( 2 ) 頁： 37 - 43 2019年2月

A Value Chain Analysis of Small-Scale Sago Industries: A Case Study of South Sulawesi, Indonesia 査読有り国際共著

Marlisa Ayu Trisia, Andi Patiware Metaragakusuma, Katsuya Osozawa, and Hiroshi Ehara

Sago Palm 26 巻 ( 1 ) 頁： 1-12 2018年12月

Responses of sago palm under water deficiency condition 査読有り国際共著国際誌

Prathumyot W., Chitaree L., Chakhatrakan S., Romkaew J., Waramit N., Matta F., Ehara H.

International Journal of Agricultural Technology 14 巻 ( 7 ) 頁： 1679 - 1684 2018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：International Journal of Agricultural Technology

The response of sago palm under water deficiency conditions was determined. Results showed that plants which watered at 7 days interval gave low leaf water potential which resulted in low water content in the roots and plants. There was not affected on the growth of sago palm as determined by plant height, leaf number, green value of leaf (SPAD), chlorophyll concentration, leaf dry weight and dry weight of whole plant. The concentration of nitrogen, phosphorus, potassium, calcium and magnesium in leaves of plants treated with water deficiency treatment did not differed in comparison to the plants treated with the normal water supply treatments.

Scopus

Photosynthesis of sago palm (Metroxylon sagu rottb.) seedling at different air temperatures 国際共著国際誌

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

Agriculture (Switzerland) 8 巻 ( 1 ) 頁： 4 - 4 2018年1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：Agriculture (Switzerland)

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 °C, while the higher end was 29–33 °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

Web of Science

Scopus

High-level ethanol production from sago residue hydrolysate prepared with thermostable α-amylase and amyloglucosidase 査読有り国際共著

Utami, A., Isono, N. and Ehara, H.

Sago Palm 25 巻 ( 1 ) 頁： 14-20 2017年7月

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