50. ウキクサの2段階ストレスによる花成誘導とKODA

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When Lemna paucicostata 441 subjected to drought, heat or osmotic stress were immersed in water, strong factor C activity (flower-inducing activity after incubation with norepinephrine (NE)) appeared in the water (Takimoto et al. 1994). Yokoyama et al. (2000) isolated the essential component of factor C from this solution, clarified its chemical structure as 9-hydroxy-10-oxo-12(Z), 15(Z) octadecadienoic acid, and named it KODA. Yamaguchi et al. (2001) detected FN1, which showed a strong flower-inducing activity in the mixture of KODA and NE after incubation, and the structure of FN1 was determined. When the plants subjected to drought were immersed in water, the water (D-WS) had no flower-inducing activity without addition of NE. However, when the plants subjected to drought followed by heat stress were immersed, the water (W-WS) had a high flower-inducing activity. In this study, we analyzed the water to clarify the role of KODA in the phenomena. HPLC analysis showed that the peak corresponding to FN1 had not been detected in D-WS and W-WS and that they had shown the same pattern. KODA and catecholamines, such as NE and epinephrine (EP), were detected in D-WS and W-WS. D-WS and W-WS were incubated at room temperature for 1 D or with 1 M Tris-HC1 buffer for 4 D. The incubated D-WS showed a flower-inducing activity. No flower-inducing activity was found for the water in which the plants subjected to heat stress followed by drought had been immersed. These results suggest that flower-inducing substances are produced by heat stress in W-WS that contains KODA and catecholamines released by drought. Although the amount of flower-inducing substances in W-WS seems to be very small, attempts are being made to isolate and identify the flower-inducing substances.
植物化学調節学会の論文
2004-10-13

50. ウキクサの2段階ストレスによる花成誘導とKODA

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