ニホンナシ'二十世紀'の芽の休眠の深さとABAとの関係

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  • Relationship between Intensity of Bud Dormancy and Level of ABA in Japanese Pear 'Nijisseiki'
  • ニホンナシ ニジッセイキ ノ メ ノ キュウミン ノ フカサ ト ABA ト

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Two experiments were conducted to investigate the chilling requirements of vegetativeand flower buds of the Japanese pear, 'Nijisseiki' and their ABA contents during the restperiod. In Experiment 1, excised shoots of 'Nijisseiki' pear were kept at 5, 10, 15 and 20°C for 0 to 1, 500 hr, and the depth of rest of leaf bud was examined. Shoots kept at 5 °and 15 °C were examined for the depth of rest of flower buds. The ABA levels in the leafbuds and floral primordia were determined after exposures to 5 ° and 15 °C for 0 to1, 500 hr.<BR>1. On shoots that were exposed at 5 °C, the rest of the leaf bud was broken after 1, 400hr ; that of flower bud was satisfied after 1, 200 hr. After 1, 500 hr, percentages of budbreak of leaf buds were : 64 at 0 °C ; 94 at 5 °C ; 46 at 10 °C ; 30 at 15 °C, and 22 at 20°C.<BR>2. ABA concentrations in the leaf buds and floral primordia kept at 5 °C decreasedrapidly during deepest rest phase ; a decrease of ABA in the leaf buds and floral primordia kept at 15 °C was detectable only after 1, 100 hr of exposure.<BR>In Experiment 2, excised shoots of 'Nijisseiki' pear, exposed to 5 °C for 0, 300, 600 and1, 000 hr, were injected with 100 ppm ABA and kept at 5 °C for 200 more hr. The depthof rest of the flower buds and their ABA levels were determined as stated above.<BR>1. Budbreak of flower buds on shoots exposed 200 and 500 hr were inhibited by injection of 100 ppm ABA ; budbreak on shoots exposed for 800 and 1, 200 hr, there were nosignificant difference between those injected with ABA or water.<BR>2. Flower primordia of shoots administered 100 ppm of ABA contained 2 to 3 timesmore ABA than control shoots or those injected with water.

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  • 園芸学会雑誌

    園芸学会雑誌 62 (1), 75-91, 1993

    一般社団法人　園芸学会

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