89 エンドウ種子の成熟にともなう内生ブラシノステロイドの量的変動

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In order to look into the biosynthesis and metabolism of brassinosteroids (BRs) in seeds, we analyzed the levels of endogenous brassinosteroids in pea seeds at several growth stages, 1(0.04g), 2(0.10g), 3(0.18g), 4 (fully expanded seed, 0.45g) and 5 (dry mature seed. 0.23g). The amounts of brassinolide (BL) and castasterone (CS) in seeds increased as seeds matured. However, the amounts of BL and CS were decreased in the fully expanded seeds and no more detectable in dry mature seeds. This finding indicates that both BL and CS are required for the growth of seeds. 6-DeoxoCS was decreased in stage 2,but then increased, reaching the highest level in the fully expanded seeds. This seems to be because the conversion of 6-deoxoCS to biologically active BRs is lowered in the fully expanded seeds. The level of 6-deoxoCS was extremely reduced in the dry mature seeds. The levels of 6-deoxoTY, 6-deoxo3DT, 6-deoxoTE, and 6-deoxoCT fluctuated during the growth of seeds, but the levels of these BRs were not significantly reduced in the mature dry seeds, indicating that these BRs are stored in mature seeds for generating biologically active BRs during germination. In the mature seeds, 6-deoxoCT is the most abundant BR, suggesting that 6-deoxoCT is the most important storage BR. The levels of BRs in the stage 1 are all significantly increased as compared with the mature seeds, indicating that de novo synthesis of BRs also accompanies seed germination.
植物化学調節学会の論文
2002-10-31

89 エンドウ種子の成熟にともなう内生ブラシノステロイドの量的変動

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