Free amino acid relations in apple leaves before and during the differentiation of flower buds

The authors have followed the free amino-acid relations in leaves of the apple variety Ontario, before and during the differentiation of flower buds. At the time when the flower buds were being differentiated on the fruitspurs, there was found to be an almost complete disappearance of arginine from the leaves. In the period before differentiation there was a temporary drop in the aspartic acid content and a temporary rise in γ-amino-butyric acid content; except for arginine, the over-all proportions of amino acids were preserved. It is not as yet possible to decide whether the above changes have any connection with the differentiation of flower buds. *** DIRECT SUPPORT *** A01GP005 00007