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Plant and Cell Physiology Advance Access published online on June 11, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci149
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received February 7, 2005
Accepted June 6, 2005

Regular Paper

The Photosynthetic Properties of Rice Leaves Treated with Low Temperature and High Irradiance

Naoki Hirotsu 1, Amane Makino 1*, Satoshi Yokota 1, and Tadahiko Mae 1

1 Department of Applied Plant Science, Graduate School of Agricultural Science, Tohoku University, Tsutsumidori-Amamiyamachi, Sendai 981-8555, Japan

* To whom correspondence should be addressed.
Amane Makino, E-mail: makino{at}biochem.tohoku.ac.jp


  Abstract

Photosynthetic characteristics in rice (Oryza sativa L.) leaves were examined after treatment with low temperature (15°C) and high irradiance (1500 µmol quanta m-2 s-1). Decreases in quantum efficiencies in PSII ({Phi}PSII) and PSI ({Phi}PSI) and in the rate of CO2 assimilation were observed with a decrease in the maximal quantum efficiency of PSII (Fv/Fm) by simultaneous measurements of chlorophyll fluorescence, P700+ absorbance and gas exchange. The decreases in {Phi}PSII were most highly correlated with those in CO2 assimilation. Although the initial (the activity immediately measured upon extract) and total (the activity following pre-incubation with CO2 and Mg2+) activities of ribulose-1,5-bisphosphate (RuBP) carboxylase/oxygenase (Rubisco) decreased slightly, the maximal activity (the activity following treatment with SO42-) of Rubisco remained almost constant. These results indicate that the decrease in CO2 assimilation rate with the decreasing Fv/Fm was not caused by a decrease in Rubisco activity but rather by a decrease in RuBP regeneration capacity which resulted from the decrease in the rate of the linear electron transport. On the other hand, the decrease in {Phi}PSI was very small and the ratio of {Phi}PSI to {Phi}PSII increased. The de-epoxidation state of xanthophyll cycle pigments also increased. Thus, the cyclic electron transport around PSI occurred in photoinhibited leaves.

Keywords: Cyclic electron flow around PSI; Gas exchange (leaf); Low temperature; Oryza sativa L.; Photoinhibition; Ribulose-1,5-bisphosphate carboxylase/oxygenase.
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