Abstract
Abstract Freezing injury to overwintering flower buds of apricot (Prunus armeniaca L.), European plum (P. domestica L.), Japanese plum (P. salicina Lindl.), peach (P. persica (L.) Batsch.), sweet cherry (P. avium L.) and sour cherry (P. cerasus L.) was found to be associated with an exothermic process detected on the time temperature profile. This exothermic process varied with seasonal fluctuations in the hardiness of 2 peach cultivars and was consistent with the hardiness of 5 cultivars tested on 3 dates during winter. No similar exotherm was detected in pear and apple. These results suggest that flower bud injury in some Prunus species was related to a specific event that involved freezing of a ‘bound’ or ‘supercooled’ fraction of water. This fraction of water remained unfrozen in the flower bud until the temperature fell below a critical level which in our studies was as low as -27°C. Exotherm flower bud hardiness in these fruit species.
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