Endogenous Cytokinins and the Breaking of Dormancy and Apical Dominance in Potato Tubers

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Abstract
Cytokinins are present in all parts of potato tubers, and are equally distributed between the apical, lateral, and internodal tissue when dormant. However, the breaking of dormancy coincided with a rapid increase in the free base cytokinin levels in the apical buds and the tissue adjacent to it. These high levels of cytokinin in the apical tissue were maintained while apical dominance was displayed. Once apical dominance was overcome the cytokinin levels in the lateral buds and the tissue adjacent to them were similar to the levels in the apical regions. The present evidence suggests that cytokinin glucosides are transported to the meristematic regions of the tubers where they are hydrolysed to their free bases. Amounts of free bases in excess of those required for growth are apparently again converted to storage forms (particularly zeatin glucoside) in the meristematic regions of the tubers and in the sprouts.

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