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Tracking chlorophyll fluorescence as an indicator of drought and rewatering across the entire leaf lifespan in a maize field
Li, Yibo1; Son, He1; Zhou, Li2; Xu, Zhenzhu; Zhou, Guangsheng2
AbstractPlant growth and photosynthesis in response to water status have been extensively investigated. However, elucidating the photosynthetic process and its indicators under a drought episode and rewatering across the entire leaf lifespan is often neglected. In this experiment, three water treatments were set during two growth seasons: a control treatment, moderate persistent drought (T-1), and severe persistent drought (T-2). Maize leaf chlorophyll fluorescence emission was analyzed to determine the regulative responses of the photosynthetic potentials and photosystem II (PSII) photochemistry process to drought and rewatering in situ. A severe drought episode during the peak vegetative growth stage resulted in decreases in chlorophyll content, the maximal efficiency of PSII photochemistry (F-v/F-m), and photochemical quenching, but increases in non-photochemical quenching and the yield for dissipation by downregulation. Rewatering only restored partial PSII functions in plants that had undergone historical drought episodes. An analysis of non-photochemical pathways of thermal dissipation indicates that regulative photoprotection of the photosystem apparatus may occur through heat dissipation when an effect of severe drought episode appeared on a young leaf; however, rewatering did not enhance photoprotection with leaf aging. Compared to the control treatment, the yield of T-1 and T-2 decreased by 25.1% and 27.1% in 2015, and 26.4% and 54.3% in 2016, respectively. The chlorophyll content was significantly and closely correlated with F-v/F-m (R = 0.65, P < 0.001) and the maximum versus minimum fluorescence yield in the dark-adapted state (F-m/F-o)(R = 0.72, P < 0.001). Additionally, the two parameters can be suggested to feasibly track chlorophyll content changes and the degree of leaf senescence in responses to a drought episode and its interaction with leaf aging: F-m/F-o and the relative limitation to photosynthesis (RLP). The current results may provide a profound insight into better understanding the underlying mechanism of photosynthetic potentials and photochemistry efficiency and photoprotection in response to drought episodes and rewatering over the entire leaf lifespan.
KeywordDrought episode Climatic change Zea mays L. Photosynthetic potentials Chlorophyll fluorescence Leaf lifespan
Subject AreaAgronomy ; Water Resources
Indexed BySCI
WOS Research AreaAgriculture ; Water Resources
WOS IDWOS:000449139500020
Publication PlaceAMSTERDAM
Funding OrganizationChina Special Fund for Meteorological Research in the Public Interest [GYHY201506019] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41330531, 31661143028]
Corresponding Author Emailxuzz@ibcas.ac.cn ; gszhou@ibcas.ac.cn
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Cited Times:26[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Meteorol Sci, China Meteorol Adm, Beijing 100081, Peoples R China
Recommended Citation
GB/T 7714
Li, Yibo,Son, He,Zhou, Li,et al. Tracking chlorophyll fluorescence as an indicator of drought and rewatering across the entire leaf lifespan in a maize field[J]. AGRICULTURAL WATER MANAGEMENT,2019,211:190-201.
APA Li, Yibo,Son, He,Zhou, Li,Xu, Zhenzhu,&Zhou, Guangsheng.(2019).Tracking chlorophyll fluorescence as an indicator of drought and rewatering across the entire leaf lifespan in a maize field.AGRICULTURAL WATER MANAGEMENT,211,190-201.
MLA Li, Yibo,et al."Tracking chlorophyll fluorescence as an indicator of drought and rewatering across the entire leaf lifespan in a maize field".AGRICULTURAL WATER MANAGEMENT 211(2019):190-201.
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