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Annals of Botany 28: 297-309, 1964
© 1964 Annals of Botany Company

RESEARCH-ARTICLE

Gravimorphibsm in Trees

3. The Possible Implication of a Root Factor in the Growth and Dominance Relationships of the Shoots

HARRY SMITH and P. F. WAREING

Department of Botany, University College of Wales, Aberystwyth

Lateral shoot-growth from the apical regions of a stem is markedly inhibited by training the stem into a complete loop. This inhibition is relieved by the induction of roots at the base of the loop, whether these roots are supplying nutrients, or deionized water. The influence of the roots on shoot-growth can be transmitted past a bark girdle, indicating that the roots are not having their effect by removing from the shoots substances inhibitory to shoot-growth. It is suggested that the roots synthesize substances essential for shoot-growth that can be translocated acropetally through the xylem. Experiments in which plants were trained into two consecutive full loops, or two consecutive arches, indicate that the monopolization of the postulated root factor by laterals on the upper side of the arch may be important in the establishment of patterns of branch dominance.


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