Effects of drought treatment on photosystemⅡactivity in the ephemeral plant Erodium oxyrhinchum  

作　　者：CHEN Yingying LIN Yajun ZHOU Xiaobing ZHANG Jing YANG Chunhong ZHANG Yuanming 

机构地区：[1]State Key Laboratory of Desert and Oasis Ecology/Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Key Laboratory of Plant Resources and Beijing Botanical Garden,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China [4]Zhejiang Lab,Hangzhou 311121,China

出　　处：《Journal of Arid Land》2023年第6期724-739,共16页干旱区科学（英文版）

基　　金：supported by the National Natural Science Foundation of China (U2003214);the Western Youth Scholars Project of the Chinese Academy of Sciences (2021-XBQNXZ-006)。

摘　　要：Drought is a critical limiting factor affecting the growth and development of plants in arid and semi-arid areas.Photosynthesis,one of the most important physiological processes of plants,can be significantly inhibited by drought.PhotosystemⅡ(PSⅡ)is considered the main attack target when photosynthesis is affected by drought.To clarify how PSⅡcomponents of the ephemeral plant Erodium oxyrhinchum(grown in the Gurbantunggut Desert,China)respond to drought treatment,we evaluated the functional activity of PSII by determining chlorophyll fluorescence and gas exchange parameters under different drought treatment levels(control(400 mL),moderate drought(200 mL),and severe drought(100 m L)).Under moderate drought treatment,significant decreases were found in net photosynthetic rate(Pn),effective quantum yield of PSII(Y(Ⅱ)),relative electron transfer rate of PSII(rETR(Ⅱ)),oxygen-releasing complex,probability of an absorbed exciton moving an electron into the electron transport chain beyond primary quinone receptor Q_(A)-(Φ(E_(o))),probability of a trapped exciton moving an electron into the electron transport chain beyond primary quinone receptor Q_(A)-(ψ(E_(o))),and performance index of PSⅡ(PI_(abs)).Compared to control treatment,marked increases were observed in water use efficiency(WUE),relative variable fluorescence at the J step(V_(J)),initial fluorescence(F_(o)),and dissipated energy per active reaction center(DI_(o)/RC)under moderate drought treatment,but there were no substantial changes in semi-saturated light intensity(I_(K)),active reaction centers per cross-section(RC/CS),and total performance index of PSII and PSI(PI_(total),where PSI is the photosystemⅠ).The changes of the above parameters under severe drought treatment were more significant than those under moderate drought treatment.In addition,severe drought treatment significantly increased the absorbed energy per active reaction center(ABS/RC)and trapping energy per active reaction center(TR_(o)/RC)but decreased the energy transmission c

关 键 词：chlorophyll fluorescence drought treatment electron transport PHOTOSYNTHESIS photosystem II Erodium oxyrhinchum Gurbantunggut Desert 

分 类 号：Q945[生物学—植物学]