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Kinetics of prolonged photoinhibition revisited: photoinhibited Photosystem II centres do not protect the active ones against loss of oxygen evolution.

Abstract：

:Photoinhibition of Photosystem II (PSII) in lincomycin-treated leaves begins as a first-order reaction, but fluorescence measurements have suggested that after prolonged illumination, the number of active PSII centres stabilizes to 15-20% of control. The stabilization has been interpreted to indicate that photoinhibited PSII centres protect the remaining active centres against photoinhibition (Lee, Hong and Chow, Planta 212:332-342, 2001). In an attempt to study the mechanism of this protection, we measured the reaction kinetics of photoinhibition in lincomycin-treated pumpkin (Cucurbita pepo L.) and pepper (Capsicum annuum L.) leaves in vivo. The light-saturated rate of PSII oxygen evolution, assayed from thylakoids and isolated from the treated leaves, was used as a direct measure of the number of remaining active PSII centres, and the fluorescence parameters F (V)/F (M) and (F (V)/F (M))/F (0) (=1/F (0) - 1/F (M)) were measured for comparison. To our surprise, no stabilization of PSII activity was observed and photoinhibition followed first-order kinetics until PSII activity had virtually declined to zero. A series of in vitro experiments was carried out to see whether stabilization of PSII activity occurs if a particular combination of light intensity and wavelength range is applied, or if a specific PSII preparation is used as experimental material. The results of the in vitro experiments confirmed the in vivo result about persistent first-order kinetics. We conclude that photoinhibited PSII centres offer no measurable protection against photoinhibition.

journal_name

Photosynth Res

journal_title

Photosynthesis research

authors

Sarvikas P,Tyystjärvi T,Tyystjärvi E

doi

10.1007/s11120-009-9496-1

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

7-17

issue

1

eissn

0166-8595

issn

1573-5079

journal_volume

103

pub_type

杂志文章

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