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Changes in endogenous level of auxins and cyto kinins in axillary buds of pisum sativum in relation to apical dominance



Changes in endogenous level of auxins and cyto kinins in axillary buds of pisum sativum in relation to apical dominance



Biologia Plantarum 19(1): 34-39



Decapitation of the stem in 1 wk old pea seedlings below the 1st node causes a rapid outgrowth of the 2 cotyledonary buds. One of them becomes dominant, while the other one is inhibited, but can be released from inhibition by cutting off the dominant bud. The level of endogenous auxins and cytokinins was determined in dominant and inhibited buds, as well as in released buds at different time intervals after deinhibition. The inhibited buds contained very little acidic, ether soluble auxins, a high level of tryptophan and also a high level of cytokinins, in comparison with dominant buds. When the inhibited buds were released from inhibition, their auxin content rose, while that of tryptophan and cytokinins decreased, reaching the level found in dominant buds within 6 days. Specific changes in content of 2 undetermined auxin-like substances were found in released buds during de-inhibition. These results are discussed in relation to the current views on the regulation of apical dominance.

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Accession: 004907526

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