Multi-Phase US Spread and Habitat Switching of a Post-Columbian Invasive, Sorghum halepense.

ABSTRACT: Johnsongrass (Sorghum halepense) is a striking example of a post-Columbian founder event. This natural experiment within ecological time-scales provides a unique opportunity for understanding patterns of continent-wide genetic diversity following range expansion. Microsatellite markers were used for population genetic analyses including leaf-optimized Neighbor-Joining tree, pairwise FST, mismatch analysis, principle coordinate analysis, Tajima's D, Fu's F and Bayesian clusterings of population structure. Evidence indicates two geographically distant introductions of divergent genotypes, which spread across much of the US in <200 years. Based on geophylogeny, gene flow patterns can be inferred to have involved five phases. Centers of genetic diversity have shifted from two introduction site

SUBMITTER: Sezen UU 

PROVIDER: S-EPMC5068735 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature