Abstract

Stem explants and leaves (without petioles) excised from axenic shoots of Populus tremula cv. Ahle or P. tremula × tremuloides cv. Munden were cultured in the presence of the non-ionic, co-polymer surfactant, Pluronic F-68. Stem explants developed shoots within 10 d of culture and significant (p<0.05), but genotype-dependent, increases in total shoot fresh weight (maximum 2 × control) occurred in cultures supplemented with 0.001–0.1% Pluronic F-68 over a 72 d period. Similarly, increases in both fresh weight (up to 10-fold) and number of shoots per P. tremula × tremuloides leaf explant (5-fold maximum) over 60 d occurred with Pluronic F-68 at 0.001%.

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