30 イネ茎葉・根の内生ブラシノステロイドに対する明暗条件の影響

概要

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The levels of endogenous brassinosteroids in shoots and roots of rice seedlings grown in light or dark were compared by GC-SIM. Castasterone, typhasterol, teasterone, 6-deoxocastasterone, 6-deoxocathasterone, 6-deoxotyphasterol, 6-deoxo-3-dehydroteasterone and 6-deoxoteasterone were identified from shoots and roots of light- or dark-grown rice seedlings: 3-dehydroteasterone was detected only in shoots. There was no detectable amount of cathasterone and brassinolide in shoots and roots. Continuous fluorescent light increased the levels of all these brassinosteroids: The levels of typhasterol and castasterone were increased about 33-fold and about 6-fold respectively, while the levels of other brassinosteroids were increased about 2 to 3-fold. Probable absence of cathasterone in shoots may indicate that the source of the increase typhasterol is 6-dexotyphasterol. Thus it is likely that light activates a putative C-6 oxidase(s) that may convert 6-deoxotyphasterol and 6-deoxocastasterone to typhasterol and castasterone, respectively. Interestingly, in root, there was no clear difference between light- and dark-grown seedlings
植物化学調節学会の論文
2000-11-02