シバザクラの開花に及ぼす低温処理の影響

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  • Effect of the Chilled Treatment on the Flowering of Phlox subulata L.
  • シバザクラ ノ カイカ ニ オヨボス テイオン ショリ ノ エイキョウ

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Phlox subulata L. were grown in two cold conditions ; at 5°C and outdoor, for 0, 20, 40 and 60 days from Dec. 4. Then the plants were transferred to two growth chambers under 20 hrs photoperiod ; at 25°C constant, and day/night temperature at 25/18°C (Experiment 1). In the summer, the other plants weregrown in two cold conditions; at 10°C and 15°C, for 5, 10, 15, 25 and 40 days from July 25. Then the plants were carried to outdoor (Experiment 2). Many inflorescences were formed in the chilled treatments of Experiment 1, however only a few inflorescence was formed in the not chilled treatments of Experiment 1, and in the all treatments of Experiment 2. These results indicated that P. subulata required cold stimulation to form inflorescences only in the winter. So P. subulata is the faculative chilling required plant. The shoot lengths were shorter as the chilled periods were longer. There were negative relationships between lengths of shoots and numbers of inflorescenses (p≤0.05). The relationships seem to be one of the correlative inhibition phenomenon.

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