Plant Physiology Preview Published on January 20, 2006; 10.1104/pp.105.070490
OPEN ACCESS ARTICLE
Received August 28, 2005
Returned for revision September 18, 2005
Accepted October 25, 2005
Chloroplastic NAD(P)H Dehydrogenase in Tobacco Leaves Functions in Alleviation of Oxidative Damage Caused by Temperature Stress
Peng Wang , Wei Duan , Atsushi Takabayashi , Tsuyoshi Endo , Toshiharu Shikanai , Ji-Yu Ye , and Hualing Mi *
National Laboratory of Plant Molecular Genetics, Institute of Plant Physiology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Fenglin Road 300, Shanghai, 200032, China
Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
Division of Integrated Life Sciences, Graduate School of Biostudies, Kyoto University, Sakyo, Kyoto 606-8502, Japan
Graduate School of Agriculture, Kyushu University, Hakozaki, Higashiku, Fukuoka 812-8581, Japan
* Corresponding author; email: mihl{at}iris.sipp.ac.cn.
In this study, we investigated the function of NDH-dependent pathway in the suppression in generation of reactive oxygen species in chloroplasts. Hydrogen peroxide (H2O2) accumulated in the leaves of Nicotiana tabacum L. defective in ndhC-ndhK-ndhJ ( ndhCKJ) at 42°C and 4°C, and in that of wild type (WT) leaves at 4°C. The maximum quantum efficiency of PSII (Fv/Fm) decreased to a similar extent in both strains at 42°C, while it decreased more evidently in ndhCKJ at 4°C. The parameters linked to CO2 assimilation such as the photochemical efficiency of PSII ( PSII), the decrease of qN following the initial rise and the photosynthetic O2 evolution were inhibited more significantly in ndhCKJ than in WT at 42°C, and were seriously inhibited in both strains at 4°C. While, cyclic electron flow around PSI mediated by NDH were remarkably enhanced at 42°C and suppressed at 4°C. The proton gradient across the thylakoid membranes and light-dependent ATP synthesis were higher in WT than in ndhCKJ at either 25°C or 42°C, but were barely formed at 4°C. Based on these results, we suggest that cyclic photophosphorylation via NDH pathway might play important role in regulation of CO2 assimilation under heat stressed condition but was less important under chilling stressed condition, thus to optimize the photosynthetic electron transport and reduce the generation of reactive oxygen species.
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