Suppression of Carotenoid Photobleaching by Kaempferol in Isolated Chloroplasts
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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 10μM. Kaempferol was photooxidized by CCCP-poisoned chloroplasts, as observed by its bleaching at 380 nm. Ascorbate inhibited the oxidation ofkaempferol. Under anaerobic conditions, kaempferol did not affect the photobleaching of carotenoid. Other flavonols, quercetin and its glycosides, also suppressed the carotenoid photobleaching. The results suggest that flavonols act as antioxidants in illuminated chloroplasts under aerobic conditions.
- 日本植物生理学会の論文
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