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  • Author or Editor: Charlen Peyton x
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A growth inhibitor isolated from dormant peach flower buds was identified as abscisic acid (ABA). Peach bud extracts were assayed for relative growth inhibition by the total acid fraction and for growth inhibition of a purified ABA fraction. Inhibition by both the total acid and ABA fractions increased in the fall until about the time of leaf abscission, and inhibition by both fractions decreased near or shortly after the end of the rest period. The inhibition by the total acid fraction decreased relatively more than the ABA fraction, possibly indicating interaction with growth promoting compounds in the total acid fraction. Inhibition increased as buds swelled, after termination of rest.

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