Abstract
The effects of exogenously applied indol-3-ylacetic acid (IAA), abscisic acid (ABA) and kinetin on the growth of lateral buds of young tomato plants have been investigated. ABA applied directly to the lateral buds had a strong inhibitory effect on their outgrowth, but when the apex of the plant was similarly treated, a stimulation of lateral bud growth comparable with that produced by decapitation occurred. Apically applied IAA had a similar effect. Kinetin caused only a short-term stimulation of lateral bud outgrowth when applied to the lateral buds of plants in which side shoot growth had been suppressed by a short period of far-red light given at the end of the photoperiod. The direct application of hadacidin (an inhibitor of adenine biosynthesis) to the lateral buds of normal plants inhibited their outgrowth, but growth resumed when the treatment was discontinued. It is suggested that lateral bud outgrowth in the tomato is controlled by a balance of apically produced auxin, cytokinins synthesised in the buds themselves and abscisic acid from the mature leaves.
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