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Plant and Cell Physiology, 2003, Vol. 44, No. 4 457-462
© 2003 Oxford University Press

Short Communications

Cyclic Electron Flow within PSII Protects PSII from its Photoinhibition in Thylakoid Membranes from Spinach Chloroplasts

Chikahiro Miyake1 and Mitsutaka Okamura

Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Hakozaki, Higashi-ku, Fukuoka, 812-8581 Japan

Abstract

Cyclic electron flow within PSII (CEF-PSII) was proven to alleviate the photoinhibition of PSII. We set the conditions where CEF-PSII functioned or did not, by adding nigericin to the reaction mixture for the dissipation of {Delta}pH across thylakoid membranes, and then the thylakoids were illuminated. When CEF-PSII did not function and the activity of linear electron flow (LEF) was low, light-treated thylakoid membranes largely lost the activity of LEF. The inactivation of LEF was due to the loss of the activity of PSII, but not that of PSI. The inactivation of PSII was suppressed, when CEF-PSII functioned or LEF was enhanced. These results imply that CEF-PSII contributes to the protection of PSII from its photoinhibition with LEF, as an electron sink.

Footnotes

1 Corresponding author (present address): Research Institute of Innovative Technology for the Earth (RITE), 9-2 Kizugawadai, Kizu-cho, Soraku-gun, Kyoto, 619-0292 Japan. Email, cmiyake{at}rite.or.jp; Fax, +81-774-75-2320.


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This article has been cited by other articles:


Home page
 Plant Cell PhysiolHome page
C. Miyake, M. Miyata, Y. Shinzaki, and K.-i. Tomizawa
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
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Home page
 Plant Cell PhysiolHome page
C. Miyake, Y. Shinzaki, M. Miyata, and K.-i. Tomizawa
Enhancement of Cyclic Electron Flow Around PSI at High Light and its Contribution to the Induction of Non-Photochemical Quenching of Chl Fluorescence in Intact Leaves of Tobacco Plants
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[Abstract] [Full Text] [PDF]


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