Effects of drought treatment on photosystem II activity in the ephemeral plant Erodium oxyrhinchum.pdf
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1、J Arid Land(2023)15(6):724739 https:/doi.org/10.1007/s40333-023-0058-8 Science Press Springer-Verlag Corresponding author:YANG Chunhong(E-mail:);ZHANG Yuanming(E-mail:)The first and second authors contributed equally to this work.Received 2022-11-19;revised 2023-03-08;accepted 2023-03-20 Xinjiang In
2、stitute of Ecology and Geography,Chinese Academy of Sciences,Science Press and Springer-Verlag GmbH Germany,part of Springer Nature 2023 http:/; Effects of drought treatment on photosystem II activity in the ephemeral plant Erodium oxyrhinchum CHEN Yingying1,2,LIN Yajun1,2,ZHOU Xiaobing1,ZHANG Jing1
3、,YANG Chunhong3,4*,ZHANG Yuanming1*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,
4、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 Abstract:Drought is a critical limiting factor affecting the growth and development of plants in arid and se
5、mi-arid areas.Photosynthesis,one of the most important physiological processes of plants,can be significantly inhibited by drought.Photosystem II(PSII)is considered the main attack target when photosynthesis is affected by drought.To clarify how PSII components of the ephemeral plant Erodium oxyrhin
6、chum(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 mL).Unde
7、r 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
8、primary quinone receptor QA(Eo),probability of a trapped exciton moving an electron into the electron transport chain beyond primary quinone receptor QA(Eo),and performance index of PSII(PIabs).Compared to control treatment,marked increases were observed in water use efficiency(WUE),relative variabl
9、e fluorescence at the J step(VJ),initial fluorescence(Fo),and dissipated energy per active reaction center(DIo/RC)under moderate drought treatment,but there were no substantial changes in semi-saturated light intensity(IK),active reaction centers per cross-section(RC/CS),and total performance index
10、of PSII and PSI(PItotal,where PSI is the photosystem I).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
11、/RC)and trapping energy per active reaction center(TRo/RC)but decreased the energy transmission connectivity of PSII components,RC/CS,and PItotal,compared to moderate drought and control treatments.Principle component analysis(PCA)revealed similar information according to the grouping of parameters.
12、Moderate drought treatment was obviously characterized by RC/CS parameter,and the values of Fo,VJ,ABS/RC,DIo/RC,and TRo/RC showed specific reactions to severe drought treatment.These results demonstrated that moderate drought treatment reduced the photochemical activity of PSII to a certain extent b
13、ut E.oxyrhinchum still showed strong adaptation against drought treatment,while severe drought treatment seriously damaged the structure of PSII.The results of CHEN Yingying et al.:Effects of drought treatment on photosystem II activity in the 725 this study are useful for further understanding the
14、adaptations of ephemeral plants to different water conditions and can provide a reference for the selection of relevant parameters for photosynthesis measurements of large samples in the field.Keywords:chlorophyll fluorescence;drought treatment;electron transport;photosynthesis;photosystem II;Erodiu
15、m oxyrhinchum;Gurbantunggut Desert Citation:CHEN Yingying,LIN Yajun,ZHOU Xiaobing,ZHANG Jing,YANG Chunhong,ZHANG Yuanming.2023.Effects of drought treatment on photosystem II activity in the ephemeral plant Erodium oxyrhinchum.Journal of Arid Land,15(6):724739.https:/doi.org/10.1007/s40333-023-0058-8
16、 1 Introduction Ephemeral plants,which are widely distributed in the Gurbantunggut Desert of China(Duan et al.,2017),are usually annual herbs with short growth cycle and high photosynthetic rate(Qiu et al.,2007;Tu et al.,2016;Wu et al.,2020).As drought sensitive species,ephemeral plants are sensitiv
17、e to water availability;they can quickly complete their life cycle by using ice and snow melting water in winter and precipitation in early spring before the arrival of dry and hot summer(Zhang and Chen,2002).Lan et al.(2008)reported that the adaptation of annual early spring ephemeral plants to the
18、 arid environment occurs not just through the specialization of internal structures,but also due to their unique physiological characteristics within their short life history.For example,adaptations against drought can be achieved by simply adjusting leaf movements to reduce leaf temperature and wat
19、er loss through respiration(Forseth and Ehleringer,1980;Yuan and Tang,2010a)or by regulating leaf osmotic potential(Forseth and Ehleringer,1982;Zhou et al.,2010).Some studies have shown that a reduction in condensate water can decrease the transpiration and net photosynthetic rate(Pn),but have no ob
20、vious impact on the intercellular CO2 concentration and water use efficiency(WUE),reflecting a stable water utilization strategy for ephemeral plants(Gong et al.,2017;Liu et al.,2018).Zhou et al.(2010)also demonstrated that drought significantly reduces Pn in Malcolmia africana.A recent study showed
21、 that increasing precipitation can promote the photosynthetic efficiency in ephemeral plants(Zhang et al.,2022).Ephemeral plants have evolved distinct adaptative mechanisms under drought conditions in the desert environment;however,the specific photosynthetic responses to drought remain unclear,espe
22、cially for photosystem II(PSII).PSII activity is a sensitive indicator to evaluate the external environmental stress for plants(Kalaji et al.,2016).PSII is considered the primary target of attack in photosynthesis under external environmental stress(Liu et al.,2018).Chlorophyll fluorescence can be u
23、sed to quantify the energy distribution dynamics of PSII and determine the photosynthetic physiological status of plants(Krause and Weis,1991).Furthermore,the rapid chlorophyll fluorescence induction kinetic curve(OJIP)can reflect the changes in primary photochemical reactions of PSII,as well as the
24、 structure and state of the photosynthetic mechanisms(Strasser et al.,1995,2004).Drought stress strongly alters the shape of the OJIP,which manifests its effects on plant physical responses in various patterns and forms the induction transient(Li,2007;Kalaji et al.,2016).It is accepted that the L(0.
25、010.30 ms),K(0.012.00 ms),H(2.0030.00 ms),and G(30.001000.00 ms)bands can be used to represent different transient stages to analyze the changes in each stage of the OJIP in more detail(Strasser et al.,2004;Stirbet and Govindjee,2012).Based on the thylakoid membrane energy flux theory,Strasser et al
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