Faculty Profiles - EHARA Hiroshi

Papers - EHARA Hiroshi

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Traditional knowledge of medicinal plants on Gau Island, Fiji: differences between sixteen villages with unique characteristics of cultural value Reviewed International coauthorship International journal

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

Journal of Ethnobiology and Ethnomedicine page： 17 - 58 2021.10

Commercialization of sago starch in Indonesia: Production, consumption and international trading Reviewed International coauthorship International journal

Marlisa Ayu Trisia, Hiroshi Ehara

Sago Palm Vol. 29 ( 1 ) page： 39 - 47 2021.8

Sago palm (Metroxylon sagu Rottb.) response to drought condition in terms of leaf gas exchange and chlorophyll a fluorescence Reviewed International coauthorship

Aidil Azhar, Daigo Makihara, Hitoshi Naito, Koki Asano, Mai Takagi, Saeka Unoki, Rena Tomita, Barahima Abbas, Hiroshi Ehara

PLANT PRODUCTION SCIENCE Vol. 24 ( 1 ) page： 65 - 72 2021.1

Authorship：Last author 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

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 Reviewed International coauthorship International journal

Aidil Azhar, Fitri Audia, Koki Asano, Daigo Makihara, Hitoshi Naito, Daisuke Sugiura, Hiroshi Ehara

Agrosystems, Geosciences & Environment Vol. 4 ( 3 ) 2021

The Role of the Sago Supply Chain for Rural Development in Indonesia: A Review and Perspective Reviewed International coauthorship International journal

Marlisa Ayu Trisia , Masashi Tachikawa , Hiroshi Ehara

Reviews in Agricultural Science 2021

Factors Determining Sago Starch Import Demand: Empirical Evidence from Japan Reviewed International journal

Marlisa Ayu Trisia, Hironobu Takeshita, Mayumi Kikuta, Hiroshi Ehara

Journal of International Logistics and Trade Vol. 18 ( 4 ) page： 159 - 167 2020.12

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Jungseok Research Institute 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 Reviewed

Trisia, M. A, Ehara, H

Sago Palm Vol. 28 ( 2 ) page： 49 - 55 2020.12

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：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 Reviewed International coauthorship

Saeka Unoki, Trias Sitaresmi, Hiroshi Ehara, Yudhistira Nugraha

Jurnal Penelitian Pertanian Tanaman Pangan Vol. 4 ( 2 ) page： 81 - 81 2020.8

Language：English Publishing type：Research paper (scientific journal) Publisher：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. Experimental Agriculture Reviewed International coauthorship International journal

Kong, K, Hin, S, Seng, V, Ismail, A. M, Vergara, G, Choi, I-R, Ehara, H, Kato, Y

Experimental Agriculture Vol. 56 ( 2 ) page： 204 - 217 2020.4

Potential yield and nutrient requirements of direct-seeded, dry-season rice in Cambodia Reviewed International coauthorship International journal

Kong , K, Hin, S, Seng, V, Ismail, A. M, Vergara, G, Choi, I-R, Ehara, H, Kato, Y

Experimental Agriculture Vol. 56 ( 2 ) page： 255 - 264 2020.4

Unique responses of three highly salt tolerant wild Vigna species against salt stress Reviewed International coauthorship International journal

Yoshida, Y, Tomooka, N, Khaing, T. Y, Shantha, P. G. S, Naito, H, Matsuda, Y, Ehara, H

Plant Production Science Vol. 23 ( 1 ) page： 114 - 128 2020.1

Evaluating sago palm (Metroxylon sagu Rottb.) photosynthetic performance in waterlogged conditions: utilizing pulse-amplitude-modulated (PAM) fluorometry as a waterlogging stress indicator Reviewed International coauthorship International journal

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

Journal of the Saudi Society of Agricultural Sciences Vol. 19 ( 1 ) page： 37 - 42 2020

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：King Saud University

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 ( I max)), quantum yield at zero to 200 µmol m−2 s−1 irradiance (ϕ( I o_ I 200)), 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 Reviewed International coauthorship

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

Sago Palm Vol. 27 ( 1 ) page： 9-14 2020

Agro-economic evaluation of fertilizer management for wet season rice in southern Cambodia Reviewed International coauthorship

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

Tropical Agriculture and Development Vol. 64 ( 4 ) page： 210-218 2019.12

Colonization of Roots in Sago Palm Seedlings Associated with Commercial Mycorrhizal Inocula Reviewed

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

Sago Palm Vol. 27 ( 1 ) page： 9 - 14 2019.10

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

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 Vol. 26 ( 2 ) page： 37 - 43 2019.2

A Value Chain Analysis of Small-Scale Sago Industries: A Case Study of South Sulawesi, Indonesia Reviewed International coauthorship

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

Sago Palm Vol. 26 ( 1 ) page： 1-12 2018.12

Responses of sago palm under water deficiency condition Reviewed International coauthorship International journal

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

International Journal of Agricultural Technology Vol. 14 ( 7 ) page： 1679 - 1684 2018.12

Photosynthesis of sago palm (Metroxylon sagu rottb.) seedling at different air temperatures International coauthorship International journal

Aidil Azhar, Daigo Makihara, Hitoshi Naito, Hiroshi Ehara

Agriculture (Switzerland) Vol. 8 ( 1 ) page： 4 - 4 2018.1

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

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 Reviewed International coauthorship

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

Sago Palm Vol. 25 ( 1 ) page： 14-20 2017.7

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Papers - EHARA Hiroshi