Regulation of lettuce hypocotyl elongation by gibberellic acid. Interaction of gibberellic acid and gibberellin synergists - dihydroconiferyl alcohol, pestalotin and a triazinone compound
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The effect of three gibberellin synergists on lettuce hypocotyl elongation was studied. Dihydroconiferyl alcohol isolated from lettuce plants and (-)-(6S, 1'S)-pestalotin isolated from Pestalotia cryptomeriaecola enhanced the promoting effect of gibberellic acid on hypocotyl elongation of lettuce seedlings with and without the cotyledons. On the other hand, TA, a triazinone compound, did not enhance the gibberellin effect. The action of (-)-(6S, 1'S)-pestalotin was strongly inhibited by competitive inhibitors of dihydroconiferyl alcohol such as caffeic, ferulic and trans-cinnamic acids. Of the two stereoisomers of pestalotin, (+)-(6R, 1'R)-pestalotin enhanced the gibberellin effect but (+)-(6R, 1'S)-epipestalotin did not. (+)-(6R, 1'S)-Epipestalotin strongly inhibited the action of (-)-(6S, 1'S)-pestalotin and dihydroconiferyl alcohol. TA did not affect the action of dihydroconiferyl alcohol. Stress-relaxation analysis of the mechanical properties of the lettuce hypocotyl cell wall demonstrated that gibberellic acid caused cell wall loosening and dihydroconiferyl alcohol and pestalotin did not influence this gibberellin effect. The action mechanism of gibberellin synergists is discussed based on these results.
- 日本植物生理学会の論文
著者
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Kamisaka Seiichiro
Department Of Biology And Geosciences Graduate School Of Science Osaka City University
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Kamisaka Seiichiro
Department Of Biology
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