Origin and Development of Aspen Root Suckers

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Abstract
The origin and development of adventitious shoots (suckers) from the roots of trembling aspen (Populustremuloides Michx.) are described. Root suckers originate from newly initiated meristems, preexisting primordia, or suppressed short shoots, but the first two are probably the most important in sucker production. Preformed shoot primordia, protuberances from the phellogen, appear to occur on roots throughout the entire aspen range. Evidence was found of suppressed short shoots in aspen roots but not of suppressed buds buried in the periderm. Vascular trace shows that the developing sucker responds to polarity in the root; it grows distally as it extends inward and basipetally to the root cambium. Lenticels on aspen roots are illustrated.

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