Abstract
The roles of auxin (IAA) and abscisic acid (ABA) in controlling lateral bud development in young intact and decapitated tomato plants have been investigated using 2,3,5-triiodobenzoic acid (TIBA) as an inhibitor of the polar transport of apically-produced or exogenously-applied auxin. When TIBA was applied as a ring in lanolin to the stem, there was a strong stimulation of growth of the lateral buds below the ring, but these buds were suppressed in their outgrowth if either ABA was applied directly to them or the plants were grown under conditions which induce a high endogenous level of ABA. Such buds were suppressed whether or not the plants were treated with TIBA and only remained so as long as ABA was continuously supplied. It is suggested that the role of auxin may be one of inducing or maintaining a high level of ABA in the region of bud initiation and that it is this ABA which inhibits full bud development.
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