CHANGES IN ABSCISIC ACID AND GIBBERELLIN LEVELS IN APPLE SEEDS DURING STRATIFICATION AND THEIR RELATIONSHIP TO GENETIC COMPACTION

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Abstract
The levels of abscisic acid (ABA) and gibberellin-like (GA-like) substances were examined in apple seeds from controlled crosses known to produce 0 or 50% compact seedlings. All seed lots exhibited similar changes in ABA and GA-like substances during an 80-day stratification period. The seeds were divided into two fractions, seed coat plus integuments (SC + I) and the embryo plus cotyledons (E + C). The ABA content of the E + C fraction was low relative to that in the SC +I fraction and gradually decreased during stratification. Abscisic acid content of the SC + I fraction increased markedly early in the stratification period and then gradually decreased. The GA-like activity, found primarily in the SC + I fraction, gradually increased (up to 40 days) and then decreased.

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