The different roles of chilling temperatures in the photoinhibition of photosystem I and photosystem II

被引：69

作者：

Sonoike, K ^{[1
]}

机构：

[1] Univ Tokyo, Grad Sch Sci, Dept Biol Sci, Bunkyo Ku, Tokyo 1130033, Japan

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY | 1999年 / 48卷 / 2-3期

关键词：

chilling damage; cyclic electron transfer; excitation pressure; photoinhibition; photosynthesis; photosystems I and II;

D O I：

10.1016/S1011-1344(99)00030-5

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The role of chilling temperatures on photoinhibition of photosystems I and II (PSI and PSII) under weak light has been examined in cucumber, a chilling-sensitive plant. The extent of PSII photoinhibition, determined by pulse-modulated fluorescence in vivo, is closely related to the redox state of the PSII electron acceptor Q(A), measured as a fluorescence parameter, 1-q(P). On the other hand, the extent of PSI photoinhibition, which is only observed in chilling-sensitive plants at chilling temperatures, cannot be related to the redox state of Q(A), suggesting that the underlying mechanism is different from that of PSII photoinhibition. Chilling treatment at low photon flux densities is found to enhance cyclic electron flow around PSI. Both PSI photoinhibition and enhanced cyclic electron flow show similar temperature dependence, with the threshold temperature at 10 degrees C. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：136 / 141

页数：6

共 31 条

[1]

[Anonymous], 1994, Photoinhibition of photosynthesis from molecular mechanisms to the field

[2]

BAKER NR, 1988, SYM SOC EXP BIOL, V42, P347

[3] PHOTOINHIBITION OF PHOTOSYNTHESIS IN CHILLED POTATO LEAVES IS NOT CORRELATED WITH A LOSS OF PHOTOSYSTEM-II ACTIVITY - PREFERENTIAL INACTIVATION OF PHOTOSYSTEM-I [J].