After six days of colchicine treatment 38% of the plants regenerated and after nine days
their number decreased to 33%. Genotype (405 × ‘Sono’)F1 was regenerating the least, only 25% of plants were received. As far as other genotypes are concerned, 37-41% regenerants
were obtained. The colchicine treatmentalso disturbed rooting in more than half of the regenerated plants.