Demystifying the origin of the highly divergent chloroplast sequence found in Mexican archaeological sunflower remains
A crop domestication center emerged ~5000 years ago in Eastern North America. Native Americans in this area transformed several wild plant species, including sunflower (Helianthus annuus) into staple crops. Archaeological evidence from Eastern North America and genomic evidence from extant cultivated and wild sunflower supports this narrative, and it was once thought that cultivated sunflower did not reach Mexico until after European colonizers established trade routes.