68. 病害抵抗性誘導物質によるウキクサの花芽分化誘導

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Salicylic acid has been shown to induce flowering in both the short-day plants Lemna paucicostata 6746,441,151 and the long-day plant Lemna gibba G3. The flower-inducing effect of salicylic acid was also observed in Pistia straiotes and Impatiens balsamina. However, the mechanism of this effect remains unknown. On the other hand, salicylic acid also induces systemic acquired resistance in rice and tobacco, and the mechanism of this effect has been thoroughly examined. To determine whether the induction of systemic acquired resistance in rice and tobacco and the induction of flowering in Lemna plants involve common processes, we examined the effects of probenazole, BTH and BIT, which induce systemic acquired resistance on the floral induction of Lemna pucicostata 151. Flowering was induced when the plant was cultured in a medium containing probenazole, BTH or BIT under continuous illumination. The induction of systemic acquired resistance is considered to be mediated through the generation of active oxygen species. Therefore, Lemna paucicostata 151 was subjected to CO_2-deficient stress under high-intensity illumination, where active oxygen species are expected to generate in the plant. The flowering of the plant was induced by photooxidative stress. Flowering was also induced when the plant was cultured in a medium containing paraquat, a herbicide-generating active oxygen species. We also examined the effects of probenazole, BTH and BIT on the floral induction of Lemna gibba G3. The flowering of the plant was promoted when probenazole, BTH or BIT was added to the medium. The present findings suggest the possibility that the induction of systemic acquired resistance in rice and tobacco and the floral induction of the Lemna plant share some common processes.
植物化学調節学会の論文
2003-10-10

68. 病害抵抗性誘導物質によるウキクサの花芽分化誘導

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