A practical method for apple cultivar identification and parent-offspring analysis using simple sequence repeat markers

Differentiation of cultivars with simple sequence repeat (SSR) markers is a very useful technique for the true-to-type characterization of cultivars and clarification of parent-offspring relationships. We developed an SSR marker set for cultivar identification comprising 15 markers that were screened from 46 previously published SSRs. This marker set could be used for apple varieties including Malus × domestica and/or other Malus species. These SSRs successfully characterized 95 apples, including the leading and major founding cultivars used worldwide for modern apple breeding. Therefore, this marker set could be applied to almost all apple cultivars. We also analyzed the parent-offspring relationships of 69 cultivars by considering allele transmissions. This analysis revealed the true parentage of the following seven cultivars: ‘Kizashi’, ‘Chinatsu’, ‘Honey Queen’, ‘Haruka’, ‘Seirin’, ‘Ozenokurenai’, and Morioka #48. This analysis also revealed a parentage discrepancy for ‘Hacnine’. From the parent-offspring analysis, two microsatellite mutation events at alleles inherited from pollen parents were observed.

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