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Plant and Cell Physiology, 1979, Vol. 20, No. 8 1659-1666
© 1979

Article

Environmental factors controlling the time of flower-opening in Pharbitis nil

Sumiko Kaihara and Atsushi Takimoto

Laboratory of Applied Botany, Faculty of Agriculture, Kyoto University Kyoto 606, Japan

Pharbitis nil, strain Violet, subjected to various photoperiods (24-hr cycle at 24°C) bloomed about 10 hr after light-off when the light period was 10 hr or longer, and about 20 hr after light-on when the light period was shorter. The higher the temperature (20–30°C) during the dark period, the later the time of flower-opening, with the temperature during the last half of the dark period having a stronger effect than that during the first half.

In continuous dark or light, flower buds of Pharbitis opened about every 24 hr at all temperatures tested between 20 and 28°C, which suggests the participation of a circadian rhythm in determining the time of flower-opening. A light pulse given 6–12 or 28–36 hr after the onset of the dark period greatly advanced the phase of this rhythm (8–10 hr). Phase delay of this rhythm could not be obtained by light pulses given at any time.

(Received September 29, 1979; )
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