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Variability of commercial plum (Prunus L. sp.) cultivars is unknown since breeding often involves intercross- ing hybrids with several species but has been based on a low number of parents. Molecular markers like amplified fragment length polymorphisms (AFLP) and inter-simple sequence repeats (ISSR), which sample multiple loci simulta- neously, have become increasingly popular, and were used to characterize 24 diploid and four hexaploid cultivars of plum. Seven AFLP and six ISSR primers were used, and resulted in amplification of 379 and 270 products, respectively. Unweighted pair-group method with arithmetic averages (UPGMA) dendrograms, based on similarity coefficients, reflected a clear separation between diploid and hexaploid plums. Among diploid plums, two pairs of cultivars were relatively distinct from the rest, namely 'Golden Japan' and 'Methley' and 'Ozark Premier' and 'Songold'. Furthermore, several cultivars were grouped together both with AFLP and ISSR analysis: 1) 'Ambra', 'Red Beaut', and 'Black Beaut', 2) 'Black Diamond' and 'Royal Diamond', 3) 'June Rose', 'Santa Rosa', and 'Royal Red', and iv) 'Freedom', 'Larry Ann', and 'Queen Rosa'. Although the phenetic classification obtained by the two methods were similar ( r = 0.73, for the diploid group), ISSR had a higher reproducibility and percentage of polymorphisms (87.4% vs. 62.8%) than AFLP. Method- ological aspects of both markers systems are discussed. Results obtained suggest that the AFLP and ISSR approaches are valuable tools for identification of specific genotypes and analysis of phenetic relationships in plum.

Phenetic Characterization of Plum Cultivars by High Multiplex Ratio Markers: Amplified Fragment Length Polymorphisms and Inter-simple Sequence Repeats