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Plant and Cell Physiology Advance Access published online on September 2, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci197
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received February 19, 2005
Accepted August 28, 2005

Regular Paper

Effects of Light Intensity on Cyclic Electron Flow around PSI and Its Relationship to Non-Photochemical Quenching of Chl Fluorescence in Tobacco Leaves

Chikahiro Miyake 1*, Sayaka Horiguchi 1, Amane Makino 2, Yuki Shinzaki 1, Hiroshi Yamamoto 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
2 Graduate School of Agricultural Sciences, Tohoku University, Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, 981-8555 Japan

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


  Abstract

We tested the hypothesis that plants grown under high light intensity (HL-plants) had a large activity of cyclic electron flow around PSI (CEF-PSI) compared to plants grown under low light (LL-plants). To evaluate the activity of CEF-PSI, the relationships between photosynthesis rate, quantum yields of both PSII and PSI, and Chl fluorescence parameters were simultaneously analyzed in intact leaves of tobacco plants which had been grown under different light-intensities (150 and 1,100 µmol photons m-2 s-1, respectively) and with different amounts of nutrients supplied. HL-plants showed a larger value of non-photochemical quenching (NPQ) of Chl fluorescence at the limited activity of photosynthetic linear electron flow. Furthermore, HL-plants had a larger activity of CEF-PSI than LL-plants. These results suggested that HL-plants dissipated the excess photon-energy through NPQ by enhancing the ability of CEF-PSI to induce acidification of the thylakoid lumen.

Keywords: Chl Fluorescence; Cyclic electron flow; Non-photochemical quenching (NPQ); Photosynthesis; PSI.
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