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- W2000660024 abstract "Papaya mosaic virus (PMV) causes severe mosaic symptoms in the papaya (Carica papaya L.) leaves. The PMV-induced alterations in photosystem II (PS II) structure and photochemical functions were probed. An increase in chlorophyll a (Chl a) fluorescence polarization suggests pathogen-induced transformation of thylakoid membrane to a gel phase. This transformation in physical state of thylakoid membrane may result in alteration in topology of pigments on pigment-binding proteins as reflected in pathogen-induced loss in the efficiency of energy transfer from carotenoids to chlorophylls. The fast Chl a fluorescence induction kinetics of healthy and PMV-infected plants by FO–FJ–FI–FP transients revealed pathogen-induced perturbation on PS II acceptor side electron transfer equilibrium between QA and QB and in the pool size of electron transport acceptors. Pathogen-induced loss in photosynthetic pigments, changes in thylakoid structure and decrease in the ratio of FV/FM (photochemical potential of PS II) further correlate with the loss in photoelectron transport of PS II as probed by 2,6-dichlorophenol indophenol (DCPIP)-Hill reaction. Restoration of the loss by 1,5-diphenyl carbazide (DPC), an exogenous electron donor, that donates electron directly to reaction centre II bypassing the oxygen evolving system (OES), leads towards the conclusion that OES is one of the major targets of biotic stress. Further, the data suggest that chlorophyll fluorescence could be used as a non-invasive handy tool to assess the loss in photosynthetic efficiency and symptom severity in infected green tissues vis-a-vis the healthy ones." @default.
- W2000660024 created "2016-06-24" @default.
- W2000660024 creator A5006211955 @default.
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- W2000660024 date "2008-04-01" @default.
- W2000660024 modified "2023-09-27" @default.
- W2000660024 title "Biotic stress induced demolition of thylakoid structure and loss in photoelectron transport of chloroplasts in papaya leaves" @default.
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- W2000660024 doi "https://doi.org/10.1016/j.plaphy.2007.12.003" @default.
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