Metapopulation structure and fine-scaled genetic structuring in crop-wild hybrid weed beets.

ABSTRACT: This study explores the microspatial and temporal genetic variation in crop-wild hybrid weed beets that emerged from the seed bank in a cultivated field surveyed over two successive years. We demonstrate the occurrence of demes highly genetically differentiated, kin-structured, characterized by moderate effective population sizes, differing in propensity for selfing, and arising from nonrandom genetic subsets of the seed bank. Only one deme identified in the first survey year significantly contributed to the weed beets that emerged in the second year. Spatial structuring appears to be primarily due to gravity seed dispersal and limited pollen flow among weed beet demes. Within each genetic cluster identified by Bayesian assignments and multivariate analyses, F(IS) estimates and level of bi

SUBMITTER: Arnaud JF 

PROVIDER: S-EPMC3199920 | biostudies-literature | 2011 Oct

REPOSITORIES: biostudies-literature