Effects of temperature and photoperiod in the summer on the flowering of <i>Camellia hiemalis</i> NAKAI

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  • 夏期の温度および日長がサザンカの開花に及ぼす影響
  • カキ ノ オンド オヨビ ニッチョウ ガ サザンカ ノ カイカ ニ オヨボス

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Abstract

The plants were grown at 18°C for 0, 15, 30 and 45 days from June 5th and then transferred at 25°C. All of the flower buds dropped by mid-October. In the reverse temperature conditions (18°C after 25°C), the longer the periods at 25°C, the greater was the flowering percentage at 18°C. The developments of stamens and pistils had large positive relationships with the length of the period at 25°C. The development of flower buds was promoted at 25°C until mid-August. A short-day treatment from June 5th advanced the date of flowering than did the long-day treatment in the open, but the flowering percentages were not affected by the photoperiod.

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