Relations between lammas shoot elongation and flower bud formation and flowering in <I>Camellia hiemalis</I> Nakai

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  • サザンカにおける土用芽の発生と花芽の形成および開花の関係
  • サザンカ ニ オケル ドヨウガ ノ ハッセイ ト カガ ノ ケイセイ オヨビ

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Abstract

On May 12, June 11, July 11, August 10, and September 9, 1993, fertilized and unfertilized, 3-year-old rooted cuttings of Camellia hiemalis Nakai were set under four different environmental conditions as : 1) 18°C and 18 h day length, 2) 25°C and 18 h day length, 3) outdoor temperature and 18 h day length, and 4) outdoor condition. At 30 day after setting plants under each condition, the growth rate of terminal buds and flower buds were determined. There was a negative relationship between percentages of flower bud formation and lammas shoot formation (r=-0.78). Lammas shoots developed from terminal buds accompanied with underdeveloped or fallen flower buds, or without flower buds. However, terminal buds with developing flower buds did not sprout. The flowering percentages negatively correlated with the percentages of lammas shoots formation (r =-0.53). These results indicate the phenomenon of correlative inhibition between leaf development and flower bud formation and flowering in C. hiemalis Nakai.

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