66 イネ種子根の生長・細胞形態・細胞壁粘弾性に対するアンシミドールとジベレリンの作用

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Role of gibberellin (GA) in growth, morphology and cell-wall extensibility has previously been studied in pea roots. It was also studied in rice leaf sheaths. However, we have few evidence for the role of GA in the growth of rice roots. In this report, we investigated the effects of GA and ancymidol (an inhibitor of GA-biosynthesis) on the growth, morphology and cell wall extensibility of seminal roots of rice (Oryza sativa, cv IRAT109). The elongation was suppressed by ancymidol and the suppression was reversed by GA. However, the degree of growth regulation was smaller than those regulation found in pea and lettuce. Seminal roots of rice showed bending and curling and it was prevented by ancymidol. All roots grew straight down in the presence of ancymidol. However, this effect of ancymidol was not canceled by GA. We have no clear explanation for these phenomena, but the contribution of other hormone remains to be investigated. The viscoelastic properties of cell walls were measured to evaluate the effect of GA and ancymidol on the cell wall extensibility. However we have not yet obtained the results which are consistent with growth regulation by ancymidol and GA. Since the effect of these regulators on the growth were small, further suppression of GA-biosynthesis may be required for the regulation of seminal roots. We are studying the pretreatment of rice seedlings by higher concentration of ancymidol for stronger suppression. He results will be presented and the relationship between GA-level and growth regulation, morphological change and cell wall extensibility will be discussed.
植物化学調節学会の論文
1999-10-01

66 イネ種子根の生長・細胞形態・細胞壁粘弾性に対するアンシミドールとジベレリンの作用

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