Abstract
The effects of temperature on the terminal bud formation of Populus×euramericana cv. 1-214 grown under short-day condition were investigated. When the night temperature was 25°C, the day temperature of 20 to 30°C exerted little influence on the critical photoperiod of the terminal bud formation, but the lower temperatures of 10 to 16°C were promotive under longer daylength, and the day temperature of 10°C induced the terminal bud formation even under 18-h photoperiods. Under the constant tempera-ture of 15°C, 14.25-h photoperiods showed SD effect, but under the lower and higher temperatures than 15°C, 14.25-h photoperiods showed LD effect.
