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Plant and Cell Physiology, 1982, Vol. 23, No. 5 859-864
© 1982

Article

Suppression of Carotenoid Photobleaching by Kaempferol in Isolated Chloroplasts

Umeo Takahama

Department of Biology, Kyushu Dental College Kitakyuthu 803, Japan

The effects of kaempferol on carotenoid photobleaching were examined using chloroplasts poisoned by carbonylcyanide m-chlorophenylhydrazone (CCCP). Kaempferol suppressed carotenoid photobleaching without affecting electron transfer reactions. Half-maximal suppression was observed at about 10 µM. Kaempferol was photooxidized by CCCP-poisoned chloroplasts, as observed by its bleaching at 380 nm. Ascorbate inhibited the oxidation of kaempferol. Under anaerobic conditions, kaempferol did not affect the photobleaching of carotenoid. Other fiavonols, quercetin and its glycosides, also suppressed the carotenoid photobleaching. The results suggest that flavonols act as antioxidants in illuminated chloroplasts under aerobic conditions.

(Received February 22, 1982; Accepted May 14, 1982)
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