Unveiling the genetic diversity and ancestry of Brassica rapa weeds in Argentina: Evidence for local adaptation and feralization
Brassica rapa is a highly diversified species that includes multiple domesticated crops, while its non-crop forms persist as weeds in disturbed habitats worldwide. In Argentina, the spread of this weed has increased since 2012, when resistance to glyphosate (transgenic) and acetohydroxyacid synthase (AHAS)-inhibiting herbicides (non-transgenic) was first reported. Despite their importance, the origin and genetic composition of Argentinian Brassica rapa accessions have not been thoroughly studied. In this study, we generated genotyping-by-sequencing (GBS) data for Argentinian B. rapa accessions to evaluate their genetic diversity and population structure, and to infer the origin of herbicide-resistant populations. These data were analyzed in a global context by comparison with previously published datasets.