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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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