Morpho-Physiological Response of Oryza glaberrima to Gradual Soil Drying  

作　　者：Kartika KARTIKA Jun-Ichi SAKAGAMI Benyamin LAKITAN Shin YABUTA Andi WIJAYA Sabaruddin KADIR Laily Ilman WIDURI Erna SIAGA Yoshihiro NAKAO 

机构地区：[1]Graduate School,Universitas Sriwijaya,Palembang 30139,Indonesia [2]Faculty of Agriculture,Kagoshima University,1-21-24 Korimoto,Kagoshima 890-0065,Japan [3]Department of Agronomy,College of Agriculture,Universitas Sriwijaya,Inderalaya 30662,Indonesia [4]Research Center for Sub-optimal Lands(PUR-PLSO),Sriwijaya University,Palembang 30139,Indonesia [5]Department of Soil Sciences,College of Agriculture,Universitas Sriwijaya,Inderalaya 30662,Indonesia [6]The United Graduate School of Agricultural Science,Kagoshima University,1-21-24 Korimoto,Kagoshima 890-0065,Japan

出　　处：《Rice science》2020年第1期67-74,共8页水稻科学（英文版）

基　　金：funded by the Program of the United Graduate School of Agricultural Sciences, Kagoshima University;supported by Program Penelitian Unggulan Profesi Universitas Sriwijaya (Grant No. 0006/UN9/SK.LP2M.PT/2018);Program PMDSU (Grant No. 093/SP2H/LT/DRPM/IV/2018);Enhancing International Publication Program by Directorate of Higher Education of the Ministry of Research, Technology and Higher Education of the Republic of Indonesia

摘　　要：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.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.

关 键 词：drought tolerance leaf rolling root trait stomatal conductance dry matter accumulation 

分 类 号：S51[农业科学—作物学]