Inhibition of carotenoid biosynthesis by the herbicide SAN 9789 and its consequences for the action of phytochrome on plastogenesis.

摘要: Treatment of the mustard (Sinapis alba L.) seedling with herbicide SAN 9789 inhibits synthesis colored carotenoids and interferes formation plastid membrane lipids without affecting growth morphogenesis significantly. In farred light, which is hardly absorbed by chlorophyll, development ultrastructure, ribulosebisphosphate carboxylase chlorophyll are not affected 9789. It concluded that normal phytochrome actions on structural development, protein syntheses absence provided there no significant light absorption in chlorophyll. The findings show inhibition one set components (the carotenoids) does stop other such as halt assembly. Supplementary experiments closely related compound 9785, affects amount composition but carotenoid syntheses, suggest effect due exclusively to its carotenoids. presence white or red at high fluence rate causes photodestruction photodecomposition thylakoids. These effects interpreted resulting from self-photooxidation photosensitizing action once protection against self- sensitized photooxidation lost.