期刊
HEREDITY
卷 110, 期 4, 页码 338-346出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/hdy.2012.93
关键词
Pisum sativum; simple sequence repeats; population structure; landraces; aged DNA; seed exchange
资金
- Lagersberg foundation
- Swedish Research Council for Environment
- Agricultural Sciences and Spatial Planning (FORMAS)
- Swedish Board of Agriculture
Landrace crops are formed by local adaptation, genetic drift and gene flow through seed exchange. In reverse, the study of genetic structure between landrace populations can reveal the effects of these forces over time. We present here the analysis of genetic diversity in 40 Swedish field pea (Pisum sativum L.) populations, either available as historical seed samples from the late nineteenth century or as extant gene bank accessions assembled in the late twentieth century. The historical material shows constant high levels of within-population diversity, whereas the extant accessions show varying, and overall lower, levels of within-population diversity. Structure and principal component analysis cluster most accessions, both extant and historical, in groups after geographical origin. County-wise analyses of the accessions show that the genetic diversity of the historical accessions is largely overlapping. In contrast, most extant accessions show signs of genetic drift. They harbor a subset of the alleles found in the historical accessions and are more differentiated from each other. These results reflect how, historically present metapopulations have been preserved during the twentieth century, although as genetically isolated populations. Heredity (2013) 110, 338-346; doi:10.1038/hdy.2012.93; published online 21 November 2012
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