Population structure and its effects on patterns of nucleotide polymorphism in teosinte (Zea mays ssp. parviglumis).

ABSTRACT: Surveys of nucleotide diversity in the wild ancestor of maize, Zea mays ssp. parviglumis, have revealed genomewide departures from the standard neutral equilibrium (NE) model. Here we investigate the degree to which population structure may account for the excess of rare polymorphisms frequently observed in species-wide samples. On the basis of sequence data from five nuclear and two chloroplast loci, we found significant population genetic structure among seven subpopulations from two geographic regions. Comparisons of estimates of population genetic parameters from species-wide samples and subpopulation-specific samples showed that population genetic subdivision influenced observed patterns of nucleotide polymorphism. In particular, Tajima's D was significantly higher (closer to zero) in

SUBMITTER: Moeller DA 

PROVIDER: S-EPMC1931540 | biostudies-literature | 2007 Jul

REPOSITORIES: biostudies-literature