69. 花成に関与する生理活性物質
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We are studying physiologically-active substances which are involved in the flowering regulation. In the present paper, we report that the metabolic pathway to salicylic acid is involved in the stress-induced flowering of Pharbitis nil. The stress-induced flowering is inhibited by aminooxyaetic acid (AOA). Therefore, one of the four metabolic pathways which are inhibited by AOA, that is, the chlorogenic acid root, salicylic acid root, anthocyanin root, or ethylene root must be involved in the regulation of stress-induced flowering. We studied the effect of metabolic intermediates to recover the inhibition caused by AOA. The 5-day-old seedlings of Pharbitis nil, 'Violet' were water-cultured in mineral nutrient culture solution under long-days condition (16h light period), and given 10-day treatment of low temperature at 13℃. Flowering was induced by this treatment. If AOA was added to the nutrient culture solution, the flowering response was inhibited. When t-cinnamic acid or benzoic acid was added together with AOA, they recovered the flower-inhibiting effect of AOA. p-Coumaric acid, caffeic acid or ACC did not recover the inhibiting effect of AOA. From these results, it was concluded that the metabolic pathway from t-cinnamic acid to benzoic acid to benzoic acid is involved in the regulation of stress-induced flowering. The same experiment was performed at 25℃ under poor nutrient condition, that is, the plants were grown in tap water instead of mineral nutrient culture solution. Further, the effect of salicylic acid which was metabolized from benzoic acid was examined. From these results, the physiologically-active substances involved in the stress-induced flowering of P. nil will be discussed.
- 植物化学調節学会の論文
- 2003-10-10
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