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Dr. Jun-Ich Sakagami
Department of Agricultural Sciences and Natural Resources, Faculty of Agriculture, Kagoshima University, Kagoshima 890-0065, Japan

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0 Salinity
0 Drought
0 Genetic Diversity
0 Priming
0 Crop Modeling

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Journal article
Published: 08 April 2021 in Agronomy
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Flooding and drought are major causes of reductions in crop productivity. Root distribution indicates crop adaptation to water stress. Therefore, we aimed to identify crop roots response based on root distribution under various soil conditions. The root distribution of four crops—maize, millet, sorghum, and rice—was evaluated under continuous soil waterlogging (CSW), moderate soil moisture (MSM), and gradual soil drying (GSD) conditions. Roots extended largely to the shallow soil layer in CSW and grew longer to the deeper soil layer in GSD in maize and sorghum. GSD tended to promote the root and shoot biomass across soil moisture status regardless of the crop species. The change of specific root density in rice and millet was small compared with maize and sorghum between different soil moisture statuses. Crop response in shoot and root biomass to various soil moisture status was highest in maize and lowest in rice among the tested crops as per the regression coefficient. Thus, we describe different root distributions associated with crop plasticity, which signify root spread changes, depending on soil water conditions in different crop genotypes as well as root distributions that vary depending on crop adaptation from anaerobic to aerobic conditions.

ACS Style

Phanthasin Khanthavong; Shin Yabuta; Hidetoshi Asai; Amzad Hossain; Isao Akagi; Jun-Ichi Sakagami. Root Response to Soil Water Status via Interaction of Crop Genotype and Environment. Agronomy 2021, 11, 708 .

AMA Style

Phanthasin Khanthavong, Shin Yabuta, Hidetoshi Asai, Amzad Hossain, Isao Akagi, Jun-Ichi Sakagami. Root Response to Soil Water Status via Interaction of Crop Genotype and Environment. Agronomy. 2021; 11 (4):708.

Chicago/Turabian Style

Phanthasin Khanthavong; Shin Yabuta; Hidetoshi Asai; Amzad Hossain; Isao Akagi; Jun-Ichi Sakagami. 2021. "Root Response to Soil Water Status via Interaction of Crop Genotype and Environment." Agronomy 11, no. 4: 708.

Journal article
Published: 31 January 2021 in Scientia Horticulturae
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Flood and drought have been increasing due to global climate changes and these extreme water-related events often affect crop productions globally. This study aims to develop a growth simulation model that correspond to sequential soil water status by revealing morph-physiological related responses on the chili pepper (Capsicum spp.). Two experiments were conducted in a greenhouse and nine treatments were established between dry and waterlogged soil conditions by using a slope field with sand. Results showed leaf water potential and stomatal conductance decreased with increasing soil water stress level. On the other hand, chili pepper increased total chlorophyll content and decreased chlorophyll a/b ratio to compensate the redaction of the leaf area as a response to soil water stress. Moreover, high air vapor pressure deficit and solar radiation condition influenced their morph-physiological traits as environmental stress coupled with soil water stress. A multiple regression model for estimating shoot dry weight (SDW) using plant height (PH) and soil plant analysis development (SPAD) was developed (SDW = 0.131 PH + 0.047SPAD − 2.408). It showed a high coefficient of determination (R2adj = 0.836). This model is certainly useful for estimating SDW under wide range soil water statuses and vapor pressure deficit conditions.

ACS Style

Keita Goto; Shin Yabuta; Peter Ssenyonga; Shotaro Tamaru; Jun-Ichi Sakagami. Response of leaf water potential, stomatal conductance and chlorophyll content under different levels of soil water, air vapor pressure deficit and solar radiation in chili pepper (Capsicum chinense). Scientia Horticulturae 2021, 281, 109943 .

AMA Style

Keita Goto, Shin Yabuta, Peter Ssenyonga, Shotaro Tamaru, Jun-Ichi Sakagami. Response of leaf water potential, stomatal conductance and chlorophyll content under different levels of soil water, air vapor pressure deficit and solar radiation in chili pepper (Capsicum chinense). Scientia Horticulturae. 2021; 281 ():109943.

Chicago/Turabian Style

Keita Goto; Shin Yabuta; Peter Ssenyonga; Shotaro Tamaru; Jun-Ichi Sakagami. 2021. "Response of leaf water potential, stomatal conductance and chlorophyll content under different levels of soil water, air vapor pressure deficit and solar radiation in chili pepper (Capsicum chinense)." Scientia Horticulturae 281, no. : 109943.

Journal article
Published: 12 January 2021 in Sustainability
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Regulation of non-structural carbohydrates (NSCs) are important for plants in response to submergence. In this study, the difference in non-structural carbohydrates in relation with shoot elongation between Sub1A and non-Sub1A rice genotypes was investigated. Two rice genotypes, namely Inpari30 (Sub1A genotype) and IR72442 (non-Sub1A genotype), were submerged completely for 6 days and re-aerated by lowering water level up to stem base for 6 days of post submergence. In addition, non-submerged plants (control) was treated with water level up to stem base during the experiment. Photosynthesis rate decreased in both submerged Inpari30 and IR72442 genotypes 71% and 96% lower than their control, respectively. Submerged IR72442 declined Fv/Fm 15.6% lowest than its control and both control and submerged Inpari30. Investigation of the distribution of starch and soluble sugar content in plant organs suggested that shoot elongation of non-Sub1A genotype led to starch and sugar consumption that distributed faster to the new developed organ during submergence. In contrast, Sub1A genotype of Inpari30, which did not exhibit shoot elongation and showed slower NSCs distribution during submergence, performed better on post submergence by maintaining NSCs and distributing to the new developed organ faster than IR72442. These results suggest that Sub1A genotype managed elongation and NSCs during submergence more efficiently than non-Sub1A genotype.

ACS Style

Arinal Nurrahma; Shin Yabuta; Ahmad Junaedi; Jun-Ichi Sakagami. Analysis of Non-Structural Carbohydrate in Relation with Shoot Elongation of Rice under Complete Submergence. Sustainability 2021, 13, 670 .

AMA Style

Arinal Nurrahma, Shin Yabuta, Ahmad Junaedi, Jun-Ichi Sakagami. Analysis of Non-Structural Carbohydrate in Relation with Shoot Elongation of Rice under Complete Submergence. Sustainability. 2021; 13 (2):670.

Chicago/Turabian Style

Arinal Nurrahma; Shin Yabuta; Ahmad Junaedi; Jun-Ichi Sakagami. 2021. "Analysis of Non-Structural Carbohydrate in Relation with Shoot Elongation of Rice under Complete Submergence." Sustainability 13, no. 2: 670.

Journal article
Published: 25 August 2020 in Genes
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Seed priming refers to seed enhancement methods that stimulate seed metabolism. This study evaluated the genetic diversity of hydro priming efficacy in 27 different genotypes of rice under dry to wet soil moisture conditions. The genotypes included 21 genotypes of Oryza sativa, five genotypes of Oryza glaberrima, and one genotype of NERICA (New Rice for Africa). The treated rice seeds were sown in plastic boxes under four soil moisture conditions (5%, 10%, 15%, and 20% (w/w)). The genotypes were categorized into six groups based on growth parameters using hierarchical cluster analysis. Furthermore, emergence properties were investigated by using principal component analysis based on the mean emergence time of control and primed seeds. Seed priming enhanced growth performance under the moderate dry conditions of 10% and 15% soil moisture. Meanwhile, priming efficacy was low in water stress conditions of 5% and 20% soil moisture. There were wide-ranging genotypic differences of priming efficacy under 20% soil moisture condition. Our findings indicate that the anaerobic-tolerant genotypes tend to exhibit priming efficacy under high soil moisture conditions. Furthermore, one group included all upland genotypes of O. sativa. This group originally adapted to 10% and 15% of dry conditions, and seed priming improved their features greatly.

ACS Style

Yoshihiro Nakao; Chiharu Sone; Jun-Ichi Sakagami. Genetic Diversity of Hydro Priming Effects on Rice Seed Emergence and Subsequent Growth under Different Moisture Conditions. Genes 2020, 11, 994 .

AMA Style

Yoshihiro Nakao, Chiharu Sone, Jun-Ichi Sakagami. Genetic Diversity of Hydro Priming Effects on Rice Seed Emergence and Subsequent Growth under Different Moisture Conditions. Genes. 2020; 11 (9):994.

Chicago/Turabian Style

Yoshihiro Nakao; Chiharu Sone; Jun-Ichi Sakagami. 2020. "Genetic Diversity of Hydro Priming Effects on Rice Seed Emergence and Subsequent Growth under Different Moisture Conditions." Genes 11, no. 9: 994.

Original research
Published: 03 June 2020 in Journal of Crop Science and Biotechnology
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Flooding is one of the major abiotic stresses which accounts for considerable damage to plant growth and development and induces multiple morpho-physiological dysfunctions in many crop plants, including buckwheat. The present study aimed to elucidate the potential stage and duration of waterlogging treatment during the various stage that had the most severe effect on yield in common buckwheat (Fagopyrum esculentum cv. Harunoibuki). The plants were subjected to flooding stress during 3 days at ES, MS, and FS with 5 cm of water depth. The results showed that the plant height, SPAD (soil plant analysis development) value, chlorophyll fluorescence, root analysis (length, surface area, and volume), and dry weight were found to be influenced when plants were exposed to flooding stress at each stage. Here it was demonstrated that root parameters were more impaired by flooding stress than shoot parameters. The findings concluded that early growth stage was more sensitive regarding physiological characteristics (value of SPAD and chlorophyll fluorescence) and root morphology (root length, surface area, volume, and dry weight) under flooding stress in common buckwheat.

ACS Style

Ju-Young Choi; Seong-Woo Cho; Jae-Buhm Chun; Soo Jeong Kwon; Swapan Kumar Roy; Jwa-Kyung Sung; Sun-Hee Woo; Jun-Ichi Sakagami. Morpho-physiological response of common buckwheat (Fagopyrum esculentum) to flooding stress at different growth stages. Journal of Crop Science and Biotechnology 2020, 24, 41 -49.

AMA Style

Ju-Young Choi, Seong-Woo Cho, Jae-Buhm Chun, Soo Jeong Kwon, Swapan Kumar Roy, Jwa-Kyung Sung, Sun-Hee Woo, Jun-Ichi Sakagami. Morpho-physiological response of common buckwheat (Fagopyrum esculentum) to flooding stress at different growth stages. Journal of Crop Science and Biotechnology. 2020; 24 (1):41-49.

Chicago/Turabian Style

Ju-Young Choi; Seong-Woo Cho; Jae-Buhm Chun; Soo Jeong Kwon; Swapan Kumar Roy; Jwa-Kyung Sung; Sun-Hee Woo; Jun-Ichi Sakagami. 2020. "Morpho-physiological response of common buckwheat (Fagopyrum esculentum) to flooding stress at different growth stages." Journal of Crop Science and Biotechnology 24, no. 1: 41-49.

Conference paper
Published: 10 January 2020 in IOP Conference Series: Earth and Environmental Science
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Flooding imposes a severe selection pressure on plants principally because excess water in their surroundings can deprive them of certain basic needs, notably of oxygen and of carbon dioxide and light for photosynthesis. It is one of the major abiotic influences on species' distribution and agricultural productivity world-wide. A cultivated species, O. glaberrima is origin from Africa that spread to floodplains area along river. Work to develop more tolerant crops or manage flood-prone environments more effectively is also included. Here, recent progress in elucidating the mechanisms determining tolerance versus intolerance to anaerobic stress caused by flooding in higher plants is discussed. This work integrates various specialized approaches ranging from morphology to physiology, and demonstrates how plant biology can be harnessed to improve stress tolerance in an important crop species. Materials and Methods: The research is conducted in various place of fields. As materials of rice and sugarcane, and chilli pepper are used in the experiments. Results and Discussion: We emphasize that Sub1A is not appropriate when selecting and breeding rice cultivars of O. glaberrima for resilience to longer-term submergence. Under these circumstances, a vigorous ethylene-mediated underwater elongation response by leaves is needed to return leaves to air-contact and full photosynthetic activity. Root aerenchyma is formed in waterlogged condition to on the genotype of sugarcane and oxygen in the air is supplied to the root system thorough aerenchyma. The supplied oxygen is used for root system respiration.

ACS Style

J-I Sakagami; Y Iwata; Arinal Haq Izzzawati Nurrahma; E Siaga; A Junaedi; S Yabuta. Plant adaptations to anaerobic stress caused by flooding. IOP Conference Series: Earth and Environmental Science 2020, 418, 012080 .

AMA Style

J-I Sakagami, Y Iwata, Arinal Haq Izzzawati Nurrahma, E Siaga, A Junaedi, S Yabuta. Plant adaptations to anaerobic stress caused by flooding. IOP Conference Series: Earth and Environmental Science. 2020; 418 (1):012080.

Chicago/Turabian Style

J-I Sakagami; Y Iwata; Arinal Haq Izzzawati Nurrahma; E Siaga; A Junaedi; S Yabuta. 2020. "Plant adaptations to anaerobic stress caused by flooding." IOP Conference Series: Earth and Environmental Science 418, no. 1: 012080.

Short communication
Published: 13 December 2019 in Rice Science
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Soil drought occurrence during dry season has been the main constraint, besides prolonged flooding during rainy season, in increasing cropping intensity and rice productivity in tropical riparian wetland. Use of drought tolerant rice genotype might be a suitable option for overcoming such problem. This study focused on the effects of gradual soil drying during early vegetative growth stage on morphological and physiological traits of five Oryza glaberrima genotypes, namely RAM12, RAM14, RAM59, RAM97 and RAM101, and two Oryza sativa subsp japonica genotypes, i.e. Koshihikari and Minamihatamochi. The plants were subjected to 6 d of gradual soil drying condition from 15 days after transplanting (DAT) to 20 DAT, and were allowed to recover until 22 DAT. Gradual soil drying reduced plant growth as indicated by dry mass accumulation. Drought reduced stomatal conductance and increased leaf rolling score of all the genotypes. All the genotypes showed comparable response on stomatal conductance, but O. glaberrima genotypes performed higher in leaf rolling recovery. Meanwhile, O. sativa genotypes decreased total leaf area and specific leaf area, but increased specific leaf weight in order to avoid further damages due to drought stress. Drought tolerance mechanisms in RAM101, RAM12, RAM59 and RAM14 were associated with leaf morpho-physiological responses, root traits and dry biomass accumulation.

ACS Style

Kartika Kartika; Jun-Ichi Sakagami; Benyamin Lakitan; Shin Yabuta; Andi Wijaya; Sabaruddin Kadir; Laily Ilman Widuri; Erna Siaga; Yoshihiro Nakao. Morpho-Physiological Response of Oryza glaberrima to Gradual Soil Drying. Rice Science 2019, 27, 67 -74.

AMA Style

Kartika Kartika, Jun-Ichi Sakagami, Benyamin Lakitan, Shin Yabuta, Andi Wijaya, Sabaruddin Kadir, Laily Ilman Widuri, Erna Siaga, Yoshihiro Nakao. Morpho-Physiological Response of Oryza glaberrima to Gradual Soil Drying. Rice Science. 2019; 27 (1):67-74.

Chicago/Turabian Style

Kartika Kartika; Jun-Ichi Sakagami; Benyamin Lakitan; Shin Yabuta; Andi Wijaya; Sabaruddin Kadir; Laily Ilman Widuri; Erna Siaga; Yoshihiro Nakao. 2019. "Morpho-Physiological Response of Oryza glaberrima to Gradual Soil Drying." Rice Science 27, no. 1: 67-74.

Journal article
Published: 16 June 2017 in Crop Science
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ACS Style

Chiharu Sone; Jun-Ichi Sakagami. Physiological Mechanism of Chlorophyll Breakdown for Leaves under Complete Submergence in Rice. Crop Science 2017, 57, 2729 -2738.

AMA Style

Chiharu Sone, Jun-Ichi Sakagami. Physiological Mechanism of Chlorophyll Breakdown for Leaves under Complete Submergence in Rice. Crop Science. 2017; 57 (5):2729-2738.

Chicago/Turabian Style

Chiharu Sone; Jun-Ichi Sakagami. 2017. "Physiological Mechanism of Chlorophyll Breakdown for Leaves under Complete Submergence in Rice." Crop Science 57, no. 5: 2729-2738.

Journal article
Published: 01 October 2013 in Field Crops Research
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ACS Style

Jun-Ichi Sakagami; Yukiko Joho; Chiharu Sone. Complete submergence escape with shoot elongation ability by underwater photosynthesis in African rice, Oryza glaberrima Steud. Field Crops Research 2013, 152, 17 -26.

AMA Style

Jun-Ichi Sakagami, Yukiko Joho, Chiharu Sone. Complete submergence escape with shoot elongation ability by underwater photosynthesis in African rice, Oryza glaberrima Steud. Field Crops Research. 2013; 152 ():17-26.

Chicago/Turabian Style

Jun-Ichi Sakagami; Yukiko Joho; Chiharu Sone. 2013. "Complete submergence escape with shoot elongation ability by underwater photosynthesis in African rice, Oryza glaberrima Steud." Field Crops Research 152, no. : 17-26.