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Spectral dependence of night break effect on photoperiodic floral induction in lemna paucicostata 441


, : Spectral dependence of night break effect on photoperiodic floral induction in lemna paucicostata 441. Plant & Cell Physiology 23(4): 623-630

A single dark period > 8 h induced flowering in L. 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 10 min at the 8th h of a 14-h dark period inhibited flowering. The fluence rates required for 50% inhibition were 10, 0.5, 0.1 and 3 .mu.mol .cntdot. m-1 .cntdot. s-1, respectively. When applied between the 4th and the 10th h of the dark period, lights of 450, 550 and 650 nm were inhibitory showing a maximum effect at the 8th h. The 750-nm light completely inhibited flowering when applied at any time during the first 8 h 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 curve for the effect of 750-nm light given at the 0, 4th and 8th h were essentially the same. Evidently, the presence of PFR [phytochrome far-red form] is crucial for the floral initiation throughout the first 8 h of the inductive dark period. The role of phytochrome in the photoperiodic flower induction of L. paucicostata is discussed.

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