アサガオの花成における温度とジベレリンA3の影響について〔英文〕
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Flowering of Pharbitis nil Choisy in response to exposure to a single inductive dark period was influenced by the temperature at which the plants were held after the dark period, with the optimum being 20°C. Promotion of flowering by gibberellin A3 (GA3) applied exogenously to the apex before or after the dark period was also influenced by temperature. In both instances, the higher temperature (25-35°C) inhibited the floral response.There was no or little effect of high temperature on flowering for 24h after the end of the dark period. However, high temperature for 96h or more resulted in inhibition of flowering. When 48h pulses of high temperature were employed, the most inhibitory period was from 48 to 96h after the induction. The inhibitory effect decreased with delaying application of high temperature after the induction. These responses to temperature indicate that action is not directly against the short day stimulus to flowering but, rather, on events of floral evocation at the shoot apex and they also suggest that at low temperature (20°C) floral processes occur at the apex for 10 days after induction.
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