Abstract
Abscisic acid (ABA) applied to the decapitated second internode of runner bean plants enhanced outgrowth of lateral buds only when internode stumps were no longer elongating. Applied to elongating internodes of slightly younger plants, ABA causes inhibition of bud outgrowth. Together with 10(−4) M indol-3-yl acetic acid (IAA), ABA stimulated internode elongation and interacted additively in the inhibition of bud outgrowth. A mixture of 10(−5) M ABA and 10(−6) M gibberellic acid (GA3 ) caused similar effects on internode growth as IAA + ABA, but was mutually antagonistic in effect on growth of the lateral buds.
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