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Plant and Cell Physiology, 2004, Vol. 45, No. 1 103-108
© 2004 Oxford University Press

The Function of Chloroplastic NAD(P)H Dehydrogenase in Tobacco during Chilling Stress under Low Irradiance

Xin-Guo Li1, Wei Duan, Qing-Wei Meng2, Qi Zou and Shi-Jie Zhao

College of Life Sciences, Shandong Agricultural University, Tai’an, Shandong, 271018, P.R. China

The function of chloroplastic NAD(P)H dehydrogenase (NDH) was examined by comparing a tobacco transformant ({Delta}ndhB) in which the ndhB gene had been disrupted with its wild type, upon exposure to chilling temperature (4°C) under low irradiance (100 µmol m–2 s–1 PFD). During the chilling stress, the maximum photochemical efficiency of PSII (Fv/Fm) decreased markedly in both the wild type and {Delta}ndhB. However, both Fv/Fm and P700+, as well as the PSII-driven electron transport rate (ETR), in {Delta}ndhB were lower than that in the wild type, implying that NDH-dependent cyclic electron flow around PSI functioned to protect the photosynthetic apparatus from chilling stress under low irradiance. Under the stress, non-photochemical quenching (NPQ), particularly the fast relaxing NPQ component (qf) and the de-epoxidized ratio of the xanthophyll cycle pigments, (A+Z)/(V+A+Z), were distinguishable in {Delta}ndhB from those in the wild type. The lower NPQ in {Delta}ndhB might be related to an inefficient proton gradient across thylakoid membranes ({Delta}pH) because of lacking an NDH-dependent cyclic electron flow around PSI at chilling temperature under low irradiance.

1 Present address: Xin-Guo Li, Crop Institute, Shandong Academy of Agricultural Sciences, Ji’nan, Shandong, 250100, P.R. China

2 Corresponding author: E-mail, qwmeng{at}sdau.edu.cn; Fax, +86-538-8226399.


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