Journal
NEW PHYTOLOGIST
Volume -, Issue -, Pages -Publisher
WILEY
DOI: 10.1111/nph.19361
Keywords
adaptive introgression; genomics; hybridization; Primula; whole-genome resequencing
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Through the study of extensive hybrid zones, we provide evidence of the adaptive role of introgression and its impact on the genomic composition in primroses. We also uncover chloroplast introgression and the absence of introgression in a supergene. These findings highlight the complexity of species boundaries and emphasize the importance of broad genomic and geographical sampling.
Introgression is an important source of genetic variation that can determine species adaptation to environmental conditions. Yet, definitive evidence of the genomic and adaptive implications of introgression in nature remains scarce. The widespread hybrid zones of Darwin's primroses (Primula elatior, Primula veris, and Primula vulgaris) provide a unique natural laboratory for studying introgression in flowering plants and the varying permeability of species boundaries. Through analysis of 650 genomes, we provide evidence of an introgressed genomic region likely to confer adaptive advantage in conditions of soil toxicity. We also document unequivocal evidence of chloroplast introgression, an important precursor to species-wide chloroplast capture. Finally, we provide the first evidence that the S-locus supergene, which controls heterostyly in primroses, does not introgress in this clade. Our results contribute novel insights into the adaptive role of introgression and demonstrate the importance of extensive genomic and geographical sampling for illuminating the complex nature of species boundaries.
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