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Somaclonal and in vitro mutagen-induced variability was studied in grapevine. Plants of Vitis vinifera cv. Podarok Magaracha were regenerated from leaf explants through somatic embryogenesis. Chromosome counts of root tips was used for screening of regenerated plants. Among 242 studied plants, six (2.5%) tetraploids (2n=4x=76) were identified; all others were diploid (2n=2x=38). Neither chimeral,...