31 エンドウのブラシノステロド欠損変異株の伸長成長に対するホウ素栄養の影響

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Typical deficient symptoms of Boron (B) that is one of the essential micro-element for plants are growth retardation followed by dwarfism and sterility. It seems that their physiological disorders with B deficiency would be caused by the changes of the levels of phytohormones. We studied the relationship between B deficiency and the changes of the levels of phytohormones. Shoot elongation of brassinosteroids(BRs)-deficient pea mutants, 1kb and 1k was depressed with B deficiency more than that of gibberellin(GAs)-deficient pea mutants, 1e and 1h, as well as wild type(WT). In addition the depression of shoot elongation was recovered, especially in 1kb, by the addition of brassinolide to the culture solution. However, endogenous levels of BRs were not affected by B deficiency despite GAs and LAA levels in B deficient plants were tend to be reduced. After all, B nutrition would not related to BRs biosynthesis. On the other hand, 1kb is known the deficient mutant of not only BRs but also the whole plant steroid, and it was noted that acid-induced cell wall loosing was not observed in 1kb. B nutrition may relate to the changes of cell wall property induced by the deficiency of plant steroids including BRs.
植物化学調節学会の論文
2000-11-02