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Grain Yield,Biomass Accumulation,and Leaf Photosynthetic Characteristics of Rice under combined salinity-drought stress

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Rice science 2024年第1期31卷 118-128,I0023页

作者： WEI Huanhe GENG Xiaoyu ZHANG Xiang ZHU Wang ZHANG Xubin CHEN Yinglong HUO Zhongyang ZHOU Guisheng MENG Tianyao DAI Qigen Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/Key Laboratory of Saline-Alkali Soil Reclamation and Utilization in Coastal Areas the Ministry of Agriculture and Rural Affairs of China/Research Institute of Rice Industrial Engineering TechnologyYangzhou UniversityYangzhou 225009China Institute of Agricultural Science and Technology Development/Joint International Research Laboratory of Agriculture and Agri-Product Safety the Ministry of Education of ChinaYangzhou UniversityYangzhou 225009China

Simultaneous stresses of salinity and drought often coincide during rice-growing seasons in saline lands,primarily due to insufficient water resources and inadequate irrigation ***,combined salinity-drought stress poses a major threat to rice *** this study,two salinity levels(NS,non-salinity;HS,high salinity)along with three drought treatments(CC,control condition;DJ,drought stress imposed at jointing;DH,drought stress imposed at heading)were performed to investigate their combined influences on leaf photosynthetic characteristics,biomass accumulation,and rice yield ***,drought,and their combination led to a shortened growth period from heading to maturity,resulting in a reduced overall growth *** yield was reduced under both salinity and drought stress,with a more substantial reduction under the combined salinity-drought *** combined stress imposed at heading caused greater yield losses in rice compared with the stress imposed at ***,the combined salinity-drought stress induced greater decreases in shoot biomass accumulation from heading to maturity,as well as in shoot biomass and nonstructural carbohydrate(NSC)content in the stem at heading and ***,it increased the harvest index and NSC remobilization *** and drought reduced the leaf area index and SPAD value of flag leaves and weakened the leaf photosynthetic characteristics as indicated by lower photosynthetic rates,transpiration rates,and stomatal *** reductions were more pronounced under the combined ***,drought,and especially their combination,decreased the activities of ascorbate peroxidase,catalase,and superoxide dismutase,while increasing the contents of malondialdehyde,hydrogen peroxide,and superoxide *** results indicated a more significant yield loss in rice when subjected to combined salinity-drought *** individual and combined stresses of salinity and dro

关键词： antioxidant defense system combined salinity-drought stress drought stress photosynthetic characteristics rice salinity stress

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