Somaclonal and in vitro mutagen-induced variability was studied in gra
pevine. Plants of Vitis vinifera cv. Podarok Magaracha were regenerate
d from leaf explants through somatic embryogenesis. Chromosome counts
of root tips was used for screening of regenerated plants. Among 242 s
tudied plants, six (2.5%) tetraploids (2n=4x=76) were identified; all
others were diploid (2n=2x=38). Neither chimeral, nor aneuploid plants
were observed. Gamma-irradiation (5-100 Gy) increased tetraploid plan
t formation frequency of primary (7%) and embryogenic calluses (7.6%)
and some aneuploid plants were also found. Colchicine treatment was no
t effective for the production of tetraploid plants. Variability among
regenerated plants was also found after field testing.