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Genetic diversity in European Pisum germplasm collections
Ist Teil von
Theoretical and applied genetics, 2012-07, Vol.125 (2), p.367-380
Ort / Verlag
Berlin/Heidelberg: Springer-Verlag
Erscheinungsjahr
2012
Quelle
MEDLINE
Beschreibungen/Notizen
The distinctness of, and overlap between, pea genotypes held in several
Pisum
germplasm collections has been used to determine their relatedness and to test previous ideas about the genetic diversity of
Pisum.
Our characterisation of genetic diversity among 4,538
Pisum
accessions held in 7 European Genebanks has identified sources of novel genetic variation, and both reinforces and refines previous interpretations of the overall structure of genetic diversity in
Pisum.
Molecular marker analysis was based upon the presence/absence of polymorphism of retrotransposon insertions scored by a high-throughput microarray and SSAP approaches. We conclude that the diversity of
Pisum
constitutes a broad continuum, with graded differentiation into sub-populations which display various degrees of distinctness. The most distinct genetic groups correspond to the named taxa while the cultivars and landraces of
Pisum sativum
can be divided into two broad types, one of which is strongly enriched for modern cultivars. The addition of germplasm sets from six European Genebanks, chosen to represent high diversity, to a single collection previously studied with these markers resulted in modest additions to the overall diversity observed, suggesting that the great majority of the total genetic diversity collected for the
Pisum
genus has now been described. Two interesting sources of novel genetic variation have been identified. Finally, we have proposed reference sets of core accessions with a range of sample sizes to represent
Pisum
diversity for the future study and exploitation by researchers and breeders.