Differences in phytochrome action on the formation of carotenoids and quinones during chloroplast development in seedlings of barley (Hordeum vulgare).

Autor: Kleudgen, H. K., Grumbach, K. H.
Předmět:
Zdroj: Physiologia Plantarum; Mar1983, Vol. 57 Issue 3, p363-366, 4p
Abstrakt: The influence of phytochrome on the light induced formation of carotenoids and quinones was investigated using etiolated seedlings of barley (Hordeum vulgare L. cv. Villa). The biosynthesis of both the quinones and the carotenoids was enhanced by active phytochrome, but the formation of the individual carotenoids and quinones was influenced by quite different thresholds. In both younger and older plants the biosynthesis of β-carotene, lutein and violaxanthin was promoted by a low of Pfr threshold. The formation of plastoquinone-9, plastohydroquinone-9, α-tocoquinone and phytoquinone was also influenced by a low Pfr threshold. The biosynthesis of zeaxanthin and neoxanthin required a much higher amount of Pfr. Only antheraxanthin-likeα-tocopherol, desmethylphylloquinone and, in older leaves, α-tocoquinone exhibited a complete reversibility of the phytochrome action in their biosynthesis. The effect of phytochrome on the biosynthesis of carotenoids and quinones was different in seedlings of different age. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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