Studies on the light controlling the time of flower-opening in Pharbitis nil

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Flower buds of Pharbitis nil, strain Violet, open about I O hr after the onset of darkness at 24℃. Daylight fluorescent light at 0.3-3 W/m^2 given during the first 4 hr of this dark period delayed the time of flower-opening, but that given later had only a slight effect or was ineffective. Red light was most effective in delaying the time of flower-opening, and a 5-min red light pulse given every 30 min also was effective. The effect of this 5-min red light was partly reversed by a subsequent far-red light pulse which suggests that the absence of P_<fr> during the first 4 hr in the dark is necessary for normal timing of flower-opening. Five minutes of red light given 10 hr after the onset of darkness advanced the phase of the circadian rhythm which controls the time of flower-opening; buds opened about 7 hr earlier on the following day. This effect of red light was also reversed by a subsequent exposure to far-red light, which suggests the participation of phytochrome in this reaction.
日本植物生理学会の論文