The Possible Role of Potassium in the Activation of Axillary Buds ofBidens pilosusL. after Decapitation of the Apex

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Abstract
Growth of axillary buds in Bidens pilosus L. can be induced by decapitation of the shoot apex. By means of X-ray microanalysis it is demonstrated that immediately after decapitation K+ is apparently accumulated in the stem tissue around the node. Conventional electron microscopy on sections of this part of the tissue revealed that xylem parenchyma cells of those bundles that lead into the cotyledons are differentiated as transfer cells. The possible role of K+ transport processes in growth initiation and regulation is discussed.