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Changes in activities of both photosystems and the regulatory effect of cyclic electron flow in field-grown cotton (Gossypium hirsutum L) under water deficit

发布者:绿洲生态发布时间:2019-09-16浏览次数:13

Changes in activities of both photosystems and the regulatory effect of cyclic electron flow in field-grown cotton (Gossypium hirsutum L) under water deficit


Xiao-Ping Yi , Ya-Li Zhang ,He-Sheng Yao , Ji-Mei Han , Wah Soon Chow , Da-Yong Fan ,Wang-Feng Zhang


A B S T R A C T:

To clarify the influence of water deficit on the functionality of the photosynthetic apparatus of cotton plants, leaf
gas exchange, chlorophyll a fluorescence, and P700 redox state were examined in field-grown cotton Gossypium
hirsutum L. cv. Xinluzao 45. In addition, we measured changes in the P515 signal and analyzed the activity of
ATP synthase and the trans-thylakoid proton gradient (ΔpH). With increasing water deficit, the net CO 2 as-
similation rate (A N ) and stomatal conductance (g s ) significantly decreased, but the maximum quantum efficiency
of PSII photochemistry (F v /F m ) did not change. The photochemical activity of photosystem II (PSII) was reflected
by the photochemical quenching coefficient (qP), quantum efficiency of photosystem II [Y(II)], and electron
transport rate through PSII [ETR(II)], while the activity of photosystem I (PSI) was reflected by the quantum
efficiency of photosystem I [Y(I)] and the electron transport rate through PSI [ETR(I)]. Both activities were
maintained under mild water deficit, but were slightly decreased under moderate water deficit. Under moderate
water deficit, cyclic electron flow (CEF), the fraction of absorbed light dissipated thermally via the ΔpH- and
xanthophyll-regulated process [Y(NPQ)], and the fraction of P700 oxidized under a given set of conditions [Y
(ND)] increased. Our results suggest that the activities of both photosystems are stable under mild water deficit
and decrease only slightly under moderate water deficit. Moderate water deficit stimulates CEF, and the sti-
mulation of CEF is essential for protecting PSI and PSII against photoinhibition.

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