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Plant and Cell Physiology, 1986, Vol. 27, No. 6 961-968
© 1986

Article

Photoinactivation Sites of Photosystem I in Isolated Chloroplasts

Kazuhito Inoue1, Hidehiro Sakurai1 and Tetsuo Hiyama2

1Department of Biology, School of Education, Waseda University Shinjuku-ku, Tokyo 160, Japan
2Department of Biochemistry, Saitama University Urawa, Saituma 338, Japan

Illumination of isolated spinach chloroplasts under aerobic conditions induced photoinactivation of PS I as measured by NADP+ photoreduction with 2,6-dichlorophenolindophenol and ascorbate as electron donors. The iron-sulfur centers X, B, and A also were decreased. The extent of photoinactivation of any of these centers or P700 as single components could not account for the loss of PS I activity. It was correlated, however, with the product of each fraction of the three iron-sulfur centers remaining intact. These results suggest a linear electron transfer sequence of the three centers. Incubation of chloroplasts with xanthine oxidase in the dark also led to decrease of PS I activity as well as of iron-sulfur centers. It is concluded that the main cause of photoinactivation of PS I is the destruction of the iron-sulfur centers by some species of active oxygen produced by illuminated class II chloroplasts.

(Received December 25, 1985; Accepted May 16, 1986)
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