Ontology type: schema:ScholarlyArticle
2012-06
AUTHORSMonica Rodriguez, Domenico Rau, Donal O’Sullivan, Anthony H. D. Brown, Roberto Papa, Giovanna Attene
ABSTRACTMultilocus digenic linkage disequilibria (LD) and their population structure were investigated in eleven landrace populations of barley (Hordeum vulgare ssp. vulgare L.) in Sardinia, using 134 dominant simple-sequence amplified polymorphism markers. The analysis of molecular variance for these markers indicated that the populations were partially differentiated (F(ST) = 0.18), and clustered into three geographic areas. Consistent with this population pattern, STRUCTURE analysis allocated individuals from a bulk of all populations into four genetic groups, and these groups also showed geographic patterns. In agreement with other molecular studies in barley, the general level of LD was low (13% of locus pairs, with P < 0.01) in the bulk of 337 lines, and decayed steeply with map distance between markers. The partitioning of multilocus associations into various components indicated that genetic drift and founder effects played a major role in determining the overall genetic makeup of the diversity in these landrace populations, but that epistatic homogenising or diversifying selection was also present. Notably, the variance of the disequilibrium component was relatively high, which implies caution in the pooling of barley lines for association studies. Finally, we compared the analyses of multilocus structure in barley landrace populations with parallel analyses in both composite crosses of barley on the one hand and in natural populations of wild barley on the other. Neither of these serves as suitable mimics of landraces in barley, which require their own study. Overall, the results suggest that these populations can be exploited for LD mapping if population structure is controlled. More... »
PAGES171-184
http://scigraph.springernature.com/pub.10.1007/s00122-012-1824-8
DOIhttp://dx.doi.org/10.1007/s00122-012-1824-8
DIMENSIONShttps://app.dimensions.ai/details/publication/pub.1048281774
PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/22411093
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