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Studies on the light controlling the time of flower opening in pharbitis nil



Studies on the light controlling the time of flower opening in pharbitis nil



Plant & Cell Physiology 21(1): 21-26



Flower buds of P. nil, strain Violet, open about 10 h after the onset of darkness at 24 .degree. C. Daylight fluorescent light at 0.3-3 W/m2 given during the first 4 h of this dark period delayed the time of flower-opening, but light 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 was also 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 phytochrome-far-red during the first 4 h in the dark is necessary for normal timing of flower-opening. Five minutes of red light given 10 h after the onset of darkness advanced the phase of the circadian rhythm which controls the time of flower-opening; buds opened about 7 h 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.

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