Enhanced root and shoot development of poplar cuttings induced by Pisolithus inoculum

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Abstract
Cuttings from 4 poplar hybrids, Populus .times. cv. Northwest, P. .times. euramericana cv. 1-45/51, P. .times. euroamericana cv. DN-21, and P. .times. cv. Robusta Superba, were rooted in a medium inoculated with vermiculite-based vegetative inoculum of P. tinctorius (Pers.) Coker and Couch, produced by Abbott Laboratories, Chicago. The addition of the inoculum to the medium resulted in an enhancement in shoot and root development of all 4 clones. All clones except I-45/51 responded with significantly increased shoot length. At least 2 of the root characteristics measured, number of roots per cutting, average induced and preformed root length, total root length, and root dry weight, were significantly increased by the addition of the inoculum in 3 of the clones: ''Northwest'', ''I-45/51'' and ''DN-21''. Cultivar variations in response to the inoculation were evident. Hormonal exudates liberated by the mycelium of Pisolithus are suspected as a cause of the enhanced shoot and root development.

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