| Summary: | In order to provide molecular characteristics
of wild pear (P. pyraster) resources, six populations
(192 accessions) from different regions of Poland were
investigated with 17 SSR loci. Each of the SSR loci used
was polymorphic, with a mean of 19.5 alleles per locus
and a mean PIC of 0.806. Both the high heterozygosity (Ho
= 0.751) and low Fis (0.007) indicated that the wild pear
populations maintain a relatively high level of diversity,
while the mean Findex of 0.039 and the number of migrants
per generation (Nm = 6.996) revealed a high gene flow and
weak inter-population differentiation. AMOVA analysis
located polymorphisms mainly within populations (96%).
Genetic relations between populations did not show
correlations with geographical distances. The dispersal
influence of gene flow could be the reason of the disrupted
relationship within populations and the low interpopulation
differentiation. We did not find any evidence
to support the hypothesis about influence of interspecies
hybridization with pear cultivars on the level of wild pear
population diversity.
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