The results of the allelic state of microcatellite loci of potato varieties of Ukrainian breeding for the four SSR markers STM0019, STM3009, STM3012, STM 5136 are presented. It was established that the use of SSR markers is an effective method for evaluating the intrinsic diversity of potatoes and identifying their differences. For the purpose of genetic distances evaluating polymerase chain reaction (PCR) was performed on defined SSR markers. According to the size of the alleles, their frequencies and the polymorphic index of the locus (PIC) were calculated. According to the marker, 5 to 20 alleles in the varieties were identified. For the STM0019 marker an allele size of 98—258 bp was defined, for the STM3009 — 164—172 bp, STM3012 — 175—224 bp, STM5136 — 240—267 bp. The frequency of identified alleles was 0.08—0.33. According to the received distribution, the highest frequency for the most polymorphic marker STM0019 was revealed for 124 bp allele, that was identified in four varieties: Okolytsia, Dovira, Yavir, Skarbnitsa. The polymorphic information content of the locus (PIC) was 0.63—0.88, which indicates a sufficiently high ability of the marker system to differentiate the potato varieties. A cluster analysis was conducted to determine the similarity and diversity of varieties. Grouping into clusters of investigated genotypes was carried out using an unweighted pair group average method. According to the genetic distances for the SSR markers, the studied varieties were grouped into three clusters: Polisske dzherelo and Chervona ruta, Yavir and Skarbnitsa, Lileya and Slavyanka. It was determined that the most similar varieties were Yavir and Skarbnitsa. Also marked the most distant varieties — Fantazia, Levada. The variety Okolytsia was not included in any of the formed clusters, which may be explained by its origin, and hence a set of features that determine the direction of its use.
Keywords: Solanum tuberosum L., SSR-markers, alleles frequency, genetic distances, varieties differentiation
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