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pear cuttings were determined after they were chilled (5•Ž) for 0, 400, 800 and 1,200 hr and then exposed to the high temperature treatment. Actinomycin D was injected in cuttings before or after high temperature treatment. 1. Leaf and flower buds were released from endodormancy by exposure to 45•Ž for 4 hr, whereas buds in ecodormant stage failed to push given the same treatment. Dormancy of flower bud on 'Nijisseiki' pear tree and that of leaf and flower buds on cuttings was broken by exposure to 45•Ž for 4 hr an accumulation of 500 Chill units (A chill unit is an hour under 0•‹•`10•Ž) . There was no significant difference between the percentage bud break of calcium cyanamide-treated trees and that of the control. 2. ABA level in leaf buds decreased after exposure to 45•Ž for 4 hr following 0 and 400 hr chilling; however it increased in buds exposed to 800 and 1,200 hr of chilling. 3. Effect of high temperature treatment was reversed by pre-treatment whit Actinomycin D, whereas post-treatment with Actinomycin D did not do so.

Effect of High Temperature Treatment on Breaking of Bud Dormancy in Japanese Pear 'Nijisseiki'.