Studies on the Flowering Control of Potted Ornamental Trees and Shrubs

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Other Title
  • 花木はち物の促成に関する研究 (第1報)
  • 花木はち物の促成に関する研究-1-わい性ハナモモ'アメンドウ'について
  • カボク ハチモノ ノ ソクセイ ニ カンスル ケンキュウ 1 ワイ セイ ハナモモ アメンドウ ニ ツイテ
  • I. On Dwarf Peach ‘Amendo’ (<i>Prunus persica</i> SIEB. et ZUCC.)
  • わい性ハナモモ‘アメンドウ’について

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Abstract

A mechanism of rest of vegetative bud, a developmental process of flower bud and an effect of chilling on sprouting and flowering in some ornamental trees and shrubs have been studied by the authors since 1968 with the object of controlling a flowering of the plants.<br>The experiment presented here was taken to clarify the above problems in dwarf ornamental peach ‘Amendo’ (Prunus persica SIEB. et ZUCC.) generally grown as a pot plant. The results obtained are summarized as follows:<br>1. Under natural environment, vegetative buds began to rest in early September, and the rest became deepest from late November to late December. The buds emerged from the rest from late December to early January.<br>2. It required 6 weeks of low temperature (0°-5°C) to break the deep rest of vegetative buds. The buds in early or late stage of the rest became to resume growth after 2 to 4 weeks of the low temperature, and the result suggests that they have less cold requirement than those in the deep rest.<br>3. Flower initiation occurred in axillary buds of current-year shoots in mid September, and sepals and petals in the flower buds were formed from late September to early October. Pistil formation, started in late October, was completed in late November. After that, the flower buds discontinued development and remained at the completion stage of pistil until mid February or later.<br>4. When plants were exposed to low temperature (0°-5°C) for 6 weeks after the completion of pistil and thereafter were shifted to high temperature (15°C or above), the flower bud resumed development and grew well into flower. Low temperature treatment given before pistil formation was ineffective on the ripening of flower buds.<br>5. When plants were stored at 0°-5°C for 6 weeks from late November and then forced at minimum night temperature of 15°C, flowering pot plants of commercial value were produced in late January to early February. Potted plants, which were placed outdoors until mid January or later and then were transferred into greenhouse kept above 15°C without additional chilling, took flowers within 4 weeks after the transferance.

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