Because of the continuous introduction of germplasm from abroad, some collections
have a high number of accessions, making it difficult to explore the genetic
variability present in a germplasm bank for conservation and breeding purposes.
Therefore, the aim of this study was to quantify and analyze the structure of genetic
variability among 500 common bean accessions to construct a core collection. A total
of 58 SSRs were used for this purpose. The polymorphism information content (PIC) in
the 180 common bean accessions selected to compose the core collection ranged from
0.17 to 0.86, and the discriminatory power (DP) ranged from 0.21 to 0.90. The 500
accessions were clustered into 15 distinct groups and the 180 accessions into four
distinct groups in the Structure analysis. According to analysis of molecular
variance, the most divergent accessions comprised 97.2% of the observed genetic
variability present within the base collection, confirming the efficiency of the
selection criterion. The 180 selected accessions will be used for association mapping
in future studies and could be potentially used by breeders to direct new crosses and
generate elite cultivars that meet current and future global market needs.
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