NDLI: Photoinhibition and Active Oxygen Species Production in Detached Apple Leaves During Dehydration

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Photoinhibition and Active Oxygen Species Production in Detached Apple Leaves During Dehydration

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Photoinhibition and Active Oxygen Species Production in Detached Apple Leaves During Dehydration

Content Provider	Springer Nature Link
Author	Jia, H.S. Han, Y.Q. Li, D.Q.
Copyright Year	2003
Abstract	In the course of dehydration, the gas exchange and chlorophyll (Chl) fluorescence were measured under irradiance of 800 μmol m$^{−2}$ s$^{−1}$ in detached apple leaves, and the production of active oxygen species (AOS), hydrogen peroxide (H$_{2}$O$_{2}$), superoxide (O$_{2}$ $^{−}$), hydroxyl radical (−OH), and singlet oxygen ($^{1}$O$_{2}$), were determined. Leaf net photosynthetic rate (P $_{N}$) was limited by stomatal and non-stomatal factors at slight (2–3 h dehydration) and moderate (4–5 h dehydration) water deficiency, respectively. Photoinhibition occurred after 3-h dehydration, which was defined by the decrease of photosystem 2 (PS2) non-cyclic electron transport (P-rate). After 2-h dehydration, an obvious rise in H$_{2}$O$_{2}$ production was found as a result of photorespiration rise. If photorespiration was inhibited by sodium bisulfite (NaHSO$_{3}$), the rate of post-irradiation transient increase in Chl fluorescence (Rfp) was enhanced in parallel with a slight decline in P-rate and with an increase in Mehler reaction. At 3-h dehydration, leaf P-rate decrease could be blocked by glycine (Gly) or methyl viologen (MV) pre-treatment, and MV was more effective than Gly at moderate drought time. AOS (H$_{2}$O$_{2}$ and O$_{2}$ $^{−}$), prior to photoinhibition produced from photorespiration and Mehler reaction in detached apple leaves at slight water deficiency, were important in dissipating photon energy which was excess to the demand of CO$_{2}$ assimilation. So photoinhibition could be effectively prevented by the way of AOS production.
Starting Page	151
Ending Page	156
Page Count	6
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	41
Issue Number	1
e-ISSN	15739058
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2003-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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Photoinhibition and Active Oxygen Species Production in Detached Apple Leaves During Dehydration