Abstract
The influence of far-red light on lateral bud outgrowth in intact and decapitated tomato plants has been investigated, and the correlated changes in the levels of auxin and abscisic acid (ABA) in the axillary buds, mature leaves and stems are presented and discussed. The buds of far-red light treated plants remained inhibited following decapitation whereas those of the plants receiving no far-red light showed a further stimulation of outgrowth. It is suggested that far-red light induces the synthesis of ABA in the mature leaves, and that high endogenous levels of this hormone lead to inhibition of bud outgrowth. The role of auxin may be to maintain high levels of abscisic acid in the plant.
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