GA 3 concentration increased with dormancy releasing, then decreased, and increased again before germination in the two varieties. The dynamic changes of endogenous hormones concentration in buds of Avrolles and Judeline were similar but the magnitude and time of the change were significantly different between the two varieties, especially for GA 3. The concentrations of endogenous GA 3, ABA, IAA, and ZR were determined in buds of Avrolles and Judeline ( Malus domestica) from dormancy releasing to germination by capillary electrophoresis. In order to provide the physiological bases for selecting late-germination cultivars that can avoid late frost damage, the very late-germination variety Avrolles ( Malus domestica) was used to study the relation between the dynamic changes and balance of endogenous hormones and germination time.
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