Size-and leaf age-dependent effects on the photosynthetic and physiological responses of Artemisia ordosica to drought stress

作     者：WANG Chunyuan YU Minghan DING Guodong GAO Guanglei ZHANG Linlin HE Yingying LIU Wei WANG Chunyuan;YU Minghan;DING Guodong;GAO Guanglei;ZHANG Linlin;HE Yingying;LIU Wei

作者机构：Yanchi Research StationSchool of Soil and Water ConservationBeijing Forestry UniversityBeijing 100083China Key Laboratory of State Forestry Administration on Soil and Water ConservationBeijing Forestry UniversityBeijing 100083China 

出 版 物：《Journal of Arid Land》 (干旱区科学（英文版）)

年 卷 期：2021年第13卷第7期

页      面：744-758页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 

基　　金：This research was supported by the National Natural Science Foundation of China(31700639) the National Key Research and Development Program of China(2018YFC0507102,2016YFC0500905) 

主　　题：drought stress age difference plant size photosynthesis physiological response survival strategy 

摘      要：Drought is one of the most significant natural disasters in the arid and semi-arid areas of *** or plant organs often differ in their responses to drought and other adversities at different growth *** present,little is known about the size-and leaf age-dependent differences in the mechanisms of shrub-related drought resistance in the deserts of ***,we evaluated the photosynthetic and physiological responses of Artemisia ordosica *** drought stress using a field experiment in Mu Us Sandy Land,Ningxia Hui Autonomous Region,China in *** was manipulated by installing outdoor shelters,with four rainfall treatments applied to 12 plots(5 m×5 m).There were four rainfall levels,including a control and rainfall reductions of 30%,50%and 70%,each with three *** individual crown size as the dividing basis,we measured the responses of *** photosynthetic and physiological responses to drought at different growth stages,i.e.,large-sized(0.5 m^(2))and small-sized(≤0.5 m^(2))*** leaves of *** were divided into old leaves and young leaves for separate *** showed that:(1)under drought stress,the transfer efficiency of light energy captured by antenna pigments to the photosystem II(PSII)reaction center decreased,and the heat dissipation capacity increased *** resist the photosynthetic system damage caused by drought,*** enhanced its free radical scavenging capacity by activating its antioxidant enzyme system;and(2)growth stage and leaf age had effects on the reaction of the photosynthetic system to *** *** plants could not withstand severe drought stress(70%rainfall reduction),whereas large *** individuals could absorb deep soil water to ensure their survival in severe drought stressed *** 30%and 50%rainfall reduction conditions,young leaves had a greater ability to resist drought than old leaves,whereas the latter were more resistant