樹木の休眠に関する研究 (V) : ポプラの冬芽形成におよぼす温度の影響

概要

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The effects of temperature on the terminal bud formation of Populus x euramericana cv. I-214 inresponse to the short-day condition were investigated. Terminal bud formation was inhibited by relativelylow and high temperatures during the dark periods. The optimal nycto-temperature was about 25℃(Table 1-5).Then the critical photoperiod for terminal bud formation is the longest at 25℃(Fig.1). The effective temperature during the 6-hr supplemental light period, of the 14-hr photoperiod, inducingcontinuous shoot growth was higher than 25℃,but the lower ones were effective for promotingterminal bud formation(Table 6). The critical length of photoperiod for terminal bud formation is considered to be varied by thetemperatures of the light period and dark period and by their combination(Table 7.)
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