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Regulation of lettuce hypocotyl elongation by gibberellic acid interaction of gibberellic acid and gibberellin synergists di hydro coniferyl alcohol pestalotin and a triazinone compound


, : Regulation of lettuce hypocotyl elongation by gibberellic acid interaction of gibberellic acid and gibberellin synergists di hydro coniferyl alcohol pestalotin and a triazinone compound. Plant & Cell Physiology 20(3): 583-592

The effect of 3 gibberellin synergists on lettuce [Lactuca sativa] hypocotyl elongation was studied. Dihydroconiferyl alcohol isolated from lettuce plants and (-)-(6S, 1'S)-pestalotin isolated from Pestalotia cryptomeriaecola enhanced the promoting effect of GA on hypocotyl elongaton of lettuce seedlings with and without the cotyledons. TA [4-ethoxy-1-(p-tolyl)-s-triazine-2,6-1H, 3H-dione], 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 2 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 GA 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.

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Related references

Kamisaka, S.; Shibata, K., 1977: Anti cotyledon factor competitive inhibitors of the action of di hydro coniferyl alcohol in stimulating gibberellic acid induced lettuce hypocotyl elongation. The lettuce [Lactuca sativa] cotyledon factor, dihydroconiferyl alcohol, synergistically enhanced the stimulating effect of GA3 on hypocotyl elongation of decotylized lettuce seedlings. The action of dihydroconiferyl alcohol was inhibited by 3-(3,...

Kamisaka, S., 1973: Requirement of cotyledons for gibberellic acid-induced hypocotyl elongation in lettuce seedlings. Isolation of the cotyledon factor active in enhancing the effect of gibberellic acid. Removing cotyledons from intact lettuce seedlings depressed hypocotyl elongation caused by GA. GA-induced hypocotyl elongation in decotylized seedlings was, however, substantially enhanced by incubating the seedlings together with excised cotyledo...

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Kawamura, H.; Kamisaka, S.; Masuda, Y., 1976: Regulation of lettuce hypocotyl elongation by gibberellic acid correlation between cell elongation stress relaxation properties of the cell wall and wall poly saccharide content. Lettuce [Lactuca sativa] hypocotyl elongation caused by GA was strongly inhibited by coumarin and dichlobenil, known inhibitors of cellulose biosynthesis. Stress-relaxation analysis of the cell wall revealed that GA induced a decrease in both mini...

Kamisaka, S.S.ibata, K.S.kurai, N., 1974: A cotyledon factor: synergist of the gibberellic acid action in inducing lettuce hypocotyl elongation. Plant Growth Substances Proceedings of the International Conference: ub 1974), 8th 142-149

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