TY - JOUR
T1 - Photoinhibition of photosynthesis during rain treatment
T2 - Identification of the intersystem electron-transfer chain as the site of inhibition
AU - Ishibashi, Momoe
AU - Sonoike, Kintake
AU - Watanabe, Akira
N1 - Funding Information:
The authors are grateful to Dr. I. Terashima for helpful discussions, Mr. A. Aoyama for technical advice and Mr. H. Koike (Meiwa, Tokyo, Japan) for constructing the temperature-controlled assimilation chamber. This work was supported in part by a Fellowship from the Japan Society for the Promotion of Science for Japanese Junior Scientists to M.I., and by a grant from New Energy and Industrial Technology Development Organization (NEDO)/Research Institute of Innovative Technology for the Earth (RITE) to K. S.
PY - 1997/2
Y1 - 1997/2
N2 - 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 photooxidizable amount of P-700, the reaction centre of PSI, and the intactness of PSII was confirmed by measurements of Chl 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.
AB - 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 photooxidizable amount of P-700, the reaction centre of PSI, and the intactness of PSII was confirmed by measurements of Chl 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.
KW - Electron transport
KW - Environmental stress
KW - Leaf wetness
KW - Phaseolus vulgaris L.
KW - Photoinhibition
KW - Photosynthesis
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U2 - 10.1093/oxfordjournals.pcp.a029148
DO - 10.1093/oxfordjournals.pcp.a029148
M3 - Article
AN - SCOPUS:0030931023
SN - 0032-0781
VL - 38
SP - 168
EP - 172
JO - Plant and Cell Physiology
JF - Plant and Cell Physiology
IS - 2
ER -