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© 1972 Oxford University Press

RESEARCH-ARTICLE

Kinetin Transport to Axillary Buds of Dwarf Pea (Pisum sativum L.)

D. A. MORRIS and P. J. WINFIELD

Department of Botany, The University Southampton, SO9 5NH

Decapitation resulted in the transport of significant amounts of 14C to the axillary buds from either point of application, but pretreatment of the cut internode surface of decapitated plants with IAA (alone or in combination with unlabelled kinetin) inhibited the transport of label to the axillary buds and resulted in its accumulation in the IAA-treated region of the stem. In intact plants to which labelled kinetin was applied to the apical bud there was little movement of 14C beyond the internode subtending this bud; when labelled kinetin was applied to the roots of intact plants, 14C accumulated in the stem and apical bud but was not transported to the axillary buds. A considerable proportion of the applied radioactivity became incorporated into ethanol-insoluble/NaOH-soluble compounds in the apical bud of intact plants, in internodes treated with IAA, and in axillary buds released from dominance by removal of the apical bud.

The results are discussed in relation to the possible role of hormone-directed transport of cytokinins m the regulation of axillary bud growth.


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