Abstract

1. Lateral buds on stoolbed shoots of the apple rootstock Crab C were induced to grow out into branches, either by decapitating the main shoot at various positions from within the terminal cluster to near the base, or by removing leaves near or within the terminal cluster. 2. The treatments profoundly affected the form of the induced branch system, influencing the number of buds which grew out, the length of the branches, and their angle with the main stem. The average internode length and leaf size on the induced branches were related to the length of the branch; the lengths of successive individual internodes from the base of the branch outward showed a remarkable pattern of fluctuation which was completely independent of climatic variations and almost of treatment. 3. The foliar structures displayed at the base of the induced branch reflected the stage of development of the lateral bud from which it arose: on branches emerging low on the main stem there were four to five bud scales followed by transiti...

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