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Annals of Botany 23: 307-318, 1959
© 1959 Annals of Botany Company

RESEARCH-ARTICLE

Natural and Induced Rooting of the Stem Apex in Rubus

Y. HESLOP-HARRISON

Department of Botany, Queen's University Belfast

European Rubi of the subgenus Eubatus spread vegetatively by the rooting of stem apices at the end of the growing season. The rooting reaction involves a cycle of changes beginning at the time of the equinox with an acceleration of extension growth and the assumption of positive geotropism. Entering the ground, the stem apex forms a rooting boss, from which a short negatively geotropic shoot terminating in a resting bud arises. This resting bud develops in the subsequent spring to establish an independent daughter plant. A sequence of events re-sembling the natural rooting reaction can be induced in midsummer by darkening the apical 25 cm. of vegetative stem apices whilst still attached to the parent plant. Roots are formed within 3 weeks of darkening, and a dormant bud after 4 weeks. It seems probable that the natural rooting reaction is a response to shortening day length in the late summer.


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