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Plant and Cell Physiology, 1997, Vol. 38, No. 2 168-172
© 1997

Research Paper

Photoinhibition of Photosynthesis during Rain Treatment: Identification of the Intersystem Electron-Transfer Chain as the Site of Inhibition

Momoe Ishibashi, Kintake Sonoike1 and Akira Watanabe

Department of Biological Sciences, Graduate School of Science, University of Tokyo Bunkyo-ku, Hongo, Tokyo, 113 Japan

1Corresponding author

Continuous wetness of leaves in the light causes a reduction in the carbon exchange rate (CER) in Phaseolus vulgaris L. [Ishibashi and Terashima (1995) Plant Cell Environ. 18: 431]. In this study, we investigated the initial cause of photoinhibition upon application of water, designated rain treatment, and we found a large decrease in the rate of electron transport through the whole chain from water to methyl viologen via PSII and PSI. In spite of the decrease in the rate of electron transport, there was no decrease in the activity of either PSI or PSII when these activities were measured separately. The intactness of PSI was also confirmed by the absence of any change in the pho-tooxidizable amount of P-700, the reaction centre of PSI, and the intactness of PSII was confirmed by measurements of Chi fluorescence. The results suggest that the inhibition by the rain treatment, which occurs at the site between PSI and PSII, might be a novel type of photoinhibition, unlike the conventional types of photoinhibition that involve PSI and PSII.

(Received July 29, 1996; Accepted November 28, 1996)
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