Genetic Identification of 'Bistrica' and Its Synonyms 'Pozegaca' and 'Hauszwetsche' (Prunus domestica L.) Using SSRs

'Bistrica' is a widespread plum cultivar in the former Austro-Hungarian Empire and has been under cultivation for more than 300 years. Although 'Bistrica' is a well-known and described cultivar, due to frequently observed phenotypic variation it has been reported as a "landrace cultivar" consisting of many different "biotypes". Reliable genotype identification in situ in old traditional orchards can be difficult, so the aim of this study was to determine its SSR profile and to check the homogeneity of its genotype across the region. Nineteen out of 33 analyzed accessions shared the identical genotype at 11 SSR loci having 4-6 alleles per locus. These accessions were sourced partly from nurseries and partly from traditional orchards of rather distant regions of all the countries included in the sampling. This SSR profile might therefore be the reference for 'Bistrica'.