Free amino acids and amides in the axial parts of apple-Trees and their relationship to flower-bud initiation

Abstract

Analyses of free amino acids and amides in the axial parts of apple-trees with and without flower-bud initiation were carried out. The results obtained mostly on the basis of investigations carried out during a single vegetation season, indicate that the ratio and content of free amino acids and amides in the axial parts of apple-trees are influenced primarily by the growth of the axial parts and by nitrogen supply to the roots. These findings are in agreement with the results of Oland (1959). In fruit-bearing trees a high content of free amino acids and amides could be demonstrated, together with an increased ratio of soluble to insoluble nitrogenous compounds solely in the fruit-bearing new cluster bases (bourses). This finding is in accord with the results of Haeley and co-workers (1942). No apparent relationship could be established between the content and ratio of free amino acids and amides, and the ratio between soluble and insoluble nitrogen compounds on the one hand, and flower-bud initiation, on the other. The investigation is being continued.