Spectral Dependence of Night-break Effect on Photoperiodic Floral Induction in Lemna paucicostata 441

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A single dark period of longer than 8 hr induced flowering in Lemna paucicostata 441 cultured in E medium. Monochromatic lights of 450, 550, 650 and 750 nm with a half-power bandwidth of 9 nm given for I O min at the 8th hour of a 14-hr dark period inhibited flowering. The fluence rates required for 50% inhibition were 10. 0.5, 0.1 and 3μmol・m^<-2>・sec^<-1>, respectively. When applied between the 4th and the 1Oth hour of the dark period, lights of 450, 550 and 650 nm were inhibitory showing a maximum effect at the 8th hour. But 750-nm light completely inhibited flowering when applied at any time during the first 8 hr of the dark period. The inhibitory effect of 750-nm light given at the beginning of the dark period was totally reversed by a subsequent exposure to 650-nm light, and the fluence-response curves for the effect of 750-nm light given at the O, 4th and 8th hour were essentially the same. This suggests that the presence of P_<FR> is crucial for the floral initiation throughout the first 8 hr of the inductive dark period. The role of phytochrome in the photoperiodic flower induction of L. paucicostata is discussed.
日本植物生理学会の論文