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Plant and Cell Physiology Advance Access published online on February 8, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci067
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received July 22, 2004
Accepted January 31, 2005

Regular Paper

CO2 Response of Cyclic Electron Flow around PSI (CEF-PSI) in Tobacco Leaves-Relative Electron Fluxes through PSI and PSII Determine the Magnitude of Non-Photochemical Quenching (NPQ) of Chl Fluorescence

Chikahiro Miyake 1*, Momoko Miyata 1, Yuki Shinzaki 1, and Ken-ichi Tomizawa 1

1 Research Institute of Innovative Technology for the Earth (RITE), 9-2 Kizugawadai, Kizu-cho, Soraku-gun, Kyoto 619-0292 Japan

* To whom correspondence should be addressed.
Chikahiro Miyake, E-mail: cmiyake{at}rite.or.jp


  Abstract

We hypothesized that cyclic electron flow around PSI (CEF-PSI) participates in the induction of non-photochemical quenching (NPQ) of Chl fluorescence when the rate of photosynthetic linear electron flow (LEF) is electron-acceptor limited. To test this hypothesis, the relationships among photosynthesis rate, electron fluxes through both PSI and PSII [Je(PSI) and Je(PSII)], and Chl fluorescence parameters were simultaneously analyzed in intact leaves of tobacco plants at several light intensities and partial pressures of ambient CO2 (Ca). At low light intensities, decreasing Ca lowered the photosynthesis rate, but the electron fluxes through both PSI and PSII remained constant Je(PSI) was larger than Je(PSII), indicating the existence of CEF-PSI. Increasing the light intensity enhanced photosynthesis and the electron fluxes through both PSI and PSII. Je(PSI)/Je(PSII) also increased at high light and at high light and low Ca combined, showing a strong, positive relationship with NPQ of Chl fluorescence. These results indicated that CEF-PSI contributed to the dissipation of photon energy in excess of that consumed by photosynthesis by driving NPQ of Chl fluorescence. The main physiological function of CEF-PSI in photosynthesis of higher plants is discussed.

Keywords: A/Ci; CO2; Cyclic electron flow; PSI; Non-photochemical quenching (NPQ); Photosynthesis.
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