Shoots were regenerated from the proximal region of immature cotyledons (with the embryonic axis removed) of Prunus persica (peach) and from the same area in mature cotyledons of P. domestica (plum) and P. cerasus (sour cherry) on MS medium containing (in mg 1 ~) thiamine-HC1, 0.4; nicotinic acid, 0.5; pyridoxine-HCl, 0.5; sucrose, 25 000; and 0.7% agar. The medium was supplemented with 0.0-2.5/~M indole-butyric acid and 5-12.5/~M thidiazuron. Cultures were incubated at 24°C under 16 h photoperiod. Shoots regenerated adventitiously over a broad range of thidiazuron concentrations and 2.5/~M indole-butyric acid in 35 days. The presence of the embryonic axis inhibited the development of shoots. Regenerated shoots of peach and plum were rooted on half-strength MS inorganic semi-solid medium with 2.5-5.0/~M indole-butyric acid. Rooted plants were acclimatized and transferred to the greenhouse.

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