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During more than 50 years the vegetative propagation has been the form of maintaining and multiplication of the cv. ’Italy’ vineyards, a ’Bicane’ x ’Muscat Hamburg’ hybrid. In the current study, polymorphism in 17 microsatellite loci was used to evaluate the genetic stability at DNA level in vineyards of cv. ’Italy’ planted in different regions of the states of Paraná and São Paulo, Brazil. Unchanged and equal allele frequency indicating genetic stability was reported in 47% of the microsatellite loci in vineyards of six localities, while allele frequency variation has been observed in  Scu15vv, Udv44, Udv74, Udv96, Udv107, Udv108, Vvmd5, Vvmd6  and  Vvs3  microsatellite loci. Alleles  Udv96 140   and  Vvs3 448  , detected in vines in only one of the vineyards, evidenced somatic mutations at molecular level in cv. ’Italy’. Genetic diversity, as result of changes in the allele frequencies in 53% of microsatellite loci, was detected more frequently than somatic mutations due to new alleles. Polymorphism in microsatellite loci revealed different genetic stability in vineyards of cv. ’Italy’ cultivated in six different Brazilian regions and indicated vineyards with less genetic stability as a possible source of somatic mutants, showing traits of agronomic interest with a potential to generate new cultivars.

ciência e técnica vitivinícola/ciência e técnica vitivinícola

Differential genetic stability in vineyards of the cultivar ‘Italy’ (<i>Vitis vinifera</i>L.) cultivated in different regions of Southern and Southwestern Brazil

Differential genetic stability in vineyards of the cultivar ‘Italy’ (Vitis viniferaL.) cultivated in different regions of Southern and Southwestern Brazil