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The protective effects of pyocyanine against photoinhibition in spinach chloroplasts

Wang Yingjun, Ye Jiyu

Shanghai Institute of Plant Physiology,The Chinese Academy of Sciences.Shanghai 200032

Abstract

Under aerobic conditions,pyocyanine alleviated strong-light-induced inhibition of electron transport in spinach chloroplasts.Although nigericin,an uncoupler eliminating transmembrane proton gradient,aggravated photoinhibition,it did not abolish the protective effect of pyocyanine.Pyocyanine could protect both photosystem Ⅰand photosystem Ⅱ,but the protection of photosystem Ⅱwas observbed only at the early stage of photoinhibition.Under anaerobic conditions,pyocyanine aggravated photoinhibition in chloroplasts and lowered the activity of DCIP photoreduction and the rate of electron transport fromm water to p-BQ.It suggests that pyocyanine alleviate photoinhibition in chloroplasts by promoting cyclic electron transport around photosystem Ⅱmediated by cytochrome b559.

Key words: Photoinhibition;Pyocyanine;Protection;Photosystem Ⅱ cyclic electron transport;Spinach

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Citing This Article：

Wang Yingjun, Ye Jiyu. The protective effects of pyocyanine against photoinhibition in spinach chloroplasts. Acta Physiol Sin 1996; 48 (2): (in Chinese with English abstract).