Abstract
Plants of Begonia × tuberhybrida ‘Karelsk Jomfru’ were subjected to photoperiods of 10, 14, 18 or 24 h and temperatures of 12, 15, 18, 21 or 24°C. The increase in photoperiod from 10 to 14 h enhanced plant height, top dry weight and number of flowers. No significant effects were obtained by increasing the photoperiod from 14 to 24 h. Increase in temperature enhanced number of days to flowering, number of leaves to first flower and number of lateral breaks. In short photoperiods, the number of flowers and plant dry weight were increased with the increase in temperature. In long photoperiods, the number of flowers and plant dry weight were increased by increase in temperature from 12 to 15°C. Further increase in temperature caused a decrease in number of flowers and plant dry weight. It is concluded that in order to stimulate formation of lateral breaks, the plants must be grown in long photoperiods at a temperature of 18–21°C.Tuber formation was inhibited at photoperiods of 14 h or longer and at temperatures above 18°C. At a night temperature of 18°C, the formation of tubers was independent of day temperature. It is concluded that the critical photoperiod for tuber development is 10–14 h.
Published Version
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