In the paper a comparative analysis of three genetic similarity assessement systems is presented. Genetic similarity of 12 Polish cultivars of Avena sativa L. was established based on RAPD and ISSR molecular markers and pedigree data. Mean cultivar similarity estimation based on ISSR markers was 0.933, and the one derived from RAPD was a little lower 0.912. The mean value of coefficient of parentage (COP) was considerably lower than molecular marker polimorphism-based genetic similarities and amounted to 0.142. The highest and significant correlation coefficient (0.66) was established between genetic similarities calculated from RAPD and ISSR molecular data. Coefficients of correlation between COP matrix and genetic similarity matrices derived from molecular markers were also significant. It allows a conclusion, that each method used in this studies can be apllied separately for genetic similarity assessement.
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