Photosynthetica 2008, 46(4):506-510 | DOI: 10.1007/s11099-008-0086-9

Up-regulation of cyclic electron flow and down-regulation of linear electron flow in antisense-rca mutant rice

S. H. Jin1,2, D. Wang1, F. Y. Zhu1, X. Q. Li2, J. W. Sun1, D. A. Jiang1,*
1 State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, China
2 School of Forestry and Biotechnology, Zhejiang Forestry University, Linan, China

To investigate how excess excitation energy is dissipated in a ribulose-1,5-bisphospate carboxylase/oxygenase activase antisense transgenic rice with net photosynthetic rate (P N) half of that of wild type parent, we measured the response curve of P N to intercellular CO2 concentration (C i), electron transport rate (ETR), quantum yield of open photosystem 2 (PS2) reaction centres under irradiation (Fv'/Fm'), efficiency of total PS2 centres (ΦPS2), photochemical (qP) and non-photochemical quenching (NPQ), post-irradiation transient increase in chlorophyll (Chl) fluorescence (PITICF), and P700+ re-reduction. Carboxylation efficiency dependence on C i, ETR at saturation irradiance, and Fv'/Fm', ΦPS2, and qP under the irradiation were significantly lower in the mutant. However, NPQ, energy-dependent quenching (qE), PITICF, and P700+ re-reduction were significantly higher in the mutant. Hence the mutant down-regulates linear ETR and stimulates cyclic electron flow around PS1, which may generate the ΔpH to support NPQ and qE for dissipation of excess excitation energy.

Additional key words: chlorophyll fluorescence; CO2 assimilation rate; intercellular CO2 concentration; post-irradiation transient increase in chlorophyll fluorescence; P700+ re-reduction

Received: February 20, 2008; Accepted: July 5, 2008; Published: December 1, 2008  Show citation

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Jin, S.H., Wang, D., Zhu, F.Y., Li, X.Q., Sun, J.W., & Jiang, D.A. (2008). Up-regulation of cyclic electron flow and down-regulation of linear electron flow in antisense-rca mutant rice. Photosynthetica, 46(4), 506-510. doi: 10.1007/s11099-008-0086-9
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