Effects of Night-break-lighting Interruption on Flower Bud Formation in Chrysanthemum

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  • 暗期中断期間中における電照中断がキクの花芽形成に及ぼす影響
  • アンキ チュウダン キカンチュウ ニ オケル デンショウチュウダン ガ キク ノ カガ ケイセイ ニ オヨボス エイキョウ

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Abstract

Unexpected interruption of night-break-lighting (NB) causes serious deterioration of the quality of cut chrysanthemum flowers. The effects of the timing and duration of NB interruption on flower bud formation were investigated using autumn and summer-autumn flowering chrysanthemum genotypes in Japan. In the autumn flowering genotype of ‘Arajin 2’ flowering in December, more than three and four days of interruption of NB influenced flower bud formation when the interruption occurred 22 and 36 days after planting, respectively. On the other hand, no influence was observed of one to five days of interruption in those flowering in March. In the summer-autumn genotype of ‘Iwanohakusen’, flower bud formation was influenced by more than four days of interruption in July flowering, three days of interruption in August flowering, and more than two days of interruption in September flowering. To reveal genotype differences in the effects of the duration of NB interruption and the plant growth stages subjected to the interruption, three autumn flowering genotypes and two summer-autumn flowering genotypes were compared. Sensitivity to the NB interruption was genotype-dependent: the sensitive genotype showed a reduced leaf number flowering only a day of interruption, but the insensitive genotype showed no effect of three days of interruption. The sensitivity increased with plant growth. The present study demonstrated that the effect of NB interruption was changed by environmental factors such as the temperature, growing stage and juvenility of plants, and the cropping type.

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