Senescence of Inhibited Shoots of Peas and Apical Dominance

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Abstract
When peas of the cultivar Radio have their epicotyl removed and are selected to have two unequal shoots, the smaller of these shoots is inhibited and starts senescing when the plants are about 17 days old. This senescence is a correlative phenomenon: removal of the dominant shoot prevents it in every case. Indole-3-acetic acid partially replaces the dominant shoot in causing the senescence of the inhibited shoot. Kinetin, when applied to the inhibited shoot, prevents its senescence and causes renewed growth. The control of this senescence, therefore, resembles the inhibition of lateral growth. It differs from it in occurring only when the plants have reached a definite age. The age at which senescence starts is the same under very different conditions; it does not depend on a lack of nutrients or the maturation of the leaves. It might be associated with the development of flowers.

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