Photosynthetica 2006, 44(3):349-354 | DOI: 10.1007/s11099-006-0035-4

Ferredoxin-quinone reductase benefits cyclic electron flow around photosystem 1 in tobacco leaves upon exposure to chilling stress under low irradiance

X. G. Li1,*, P. L. Xu1, J. P. Zhao1, J. J. Meng1, Q. W. He1
1 High-Tech Research Center, Shandong Academy of Agricultural Sciences, Ji'nan, Shandong, P. R. China

The function of chloroplast ferredoxin quinone reductase (FQR)-dependent flow was examined by comparing a wild type tobacco and a tobacco transformant (ΔndhB) in which the ndhB gene had been disrupted with their antimycin A (AA)-fed leaves upon exposure to chilling temperature (4 °C) under low irradiance (100 µmol m-2 s-1 photon flux density). During the chilling stress, the maximum photochemical efficiency of photosystem (PS) 2 (Fv/Fm) decreased markedly in both the controls and AA-fed leaves, and P700+ was also lower in AA-fed leaves than in the controls, implying that FQR-dependent cyclic electron flow around PS1 functioned to protect the photosynthetic apparatus from chilling stress under low irradiance. Under such 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), formed the difference between AA-fed leaves and controls. The lower NPQ in AA-fed leaves might be related to an inefficient proton gradient across thylakoid membranes (ΔpH) because of inhibiting an FQR-dependent cyclic electron flow around PS1 at chilling temperature under low irradiance.

Additional key words: chlorophyll fluorescence; cyclic electron flow; ferredoxin quinone reductase; Nicotiana; non-photochemical quenching; photosystem 2; xanthophyll cycle

Received: October 20, 2005; Accepted: December 20, 2005; Published: September 1, 2006  Show citation

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Li, X.G., Xu, P.L., Zhao, J.P., Meng, J.J., & He, Q.W. (2006). Ferredoxin-quinone reductase benefits cyclic electron flow around photosystem 1 in tobacco leaves upon exposure to chilling stress under low irradiance. Photosynthetica, 44(3), 349-354. doi: 10.1007/s11099-006-0035-4
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