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Plant and Cell Physiology Advance Access originally published online on September 2, 2005
Plant and Cell Physiology 2005 46(11):1819-1830; doi:10.1093/pcp/pci197
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Effects of Light Intensity on Cyclic Electron Flow Around PSI and its Relationship to Non-photochemical Quenching of Chl Fluorescence in Tobacco Leaves

Chikahiro Miyake1,*, Sayaka Horiguchi1, Amane Makino2, Yuki Shinzaki1, Hiroshi Yamamoto1 and Ken-ichi Tomizawa1

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

* Corresponding author: E-mail, cmiyake{at}rite.or.jp; Fax, +81-774-75-2320.

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 with 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 analyzed simultaneously 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.

(Received February 19, 2005; Accepted August 28, 2005)
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