Effect of red light pulse on induction and production of flowers in a short-day duckweed, Lemna paucicostata 6746, in darkness

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Flowering (number of flowers) of a short-day duckweed, Lemna paucicostata 6746, in continuous darkness at 26℃ was affected by a red light pulse in various ways depending on the time of application. A conspicuous inhibition and a slight promotion were respectively caused by the pulse given at the 7th and 19th hours of the dark period. Of the recently introduced floral parameters (4), a (vegetative growth rate) and φ (flowering ratio) were almost unchanged by the pulse given at any time. P_1 (pre-flower induction period) was extended by one day when the pulse was given at about the 7th hour of the dark period. The pulse greatly extended P_2 (flower induction period) when given at about the 7th hour of the dark period. A pulse given earlier or later was increasingly ineffective on P_2. P_4 (flower production period) changed rhythmically (i.e., was extended or shortened) with the time of the red light pulse, the maximum extension and shortening being induced by the pulse given at about the 7th and 19th hours, respectively. Different timing mechanisms were suggested as controlling the sensitivities to the red light pulse of P_1 and P_2 or P_4. The floral response (number of flowers) vs. the red light pulse application time curve was explained in terms of the sum of the responses of P_2 and P_4 to the pulse. Floral parameters P_1 and P_2 were defined more clearly.
日本植物生理学会の論文