The extent of introgression between incipient Clarkia species is determined by temporal environmental variation and mating system.
| Autor: | Sianta SA; Department of Plant and Microbial Biology, University of Minnesota, St. Paul, MN 55108., Moeller DA; Department of Plant and Microbial Biology, University of Minnesota, St. Paul, MN 55108., Brandvain Y; Department of Plant and Microbial Biology, University of Minnesota, St. Paul, MN 55108. |
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| Jazyk: | angličtina |
| Zdroj: | Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2024 Mar 19; Vol. 121 (12), pp. e2316008121. Date of Electronic Publication: 2024 Mar 11. |
| DOI: | 10.1073/pnas.2316008121 |
| Abstrakt: | Introgression is pervasive across the tree of life but varies across taxa, geography, and genomic regions. However, the factors modulating this variation and how they may be affected by global change are not well understood. Here, we used 200 genomes and a 15-y site-specific environmental dataset to investigate the effects of environmental variation and mating system divergence on the magnitude of introgression between a recently diverged outcrosser-selfer pair of annual plants in the genus Clarkia . These sister taxa diverged very recently and subsequently came into secondary sympatry where they form replicated contact zones. Consistent with observations of other outcrosser-selfer pairs, we found that introgression was asymmetric between taxa, with substantially more introgression from the selfer to the outcrosser. This asymmetry was caused by a bias in the direction of initial F1 hybrid formation and subsequent backcrossing. We also found extensive variation in the outcrosser's admixture proportion among contact zones, which was predicted nearly entirely by interannual variance in spring precipitation. Greater fluctuations in spring precipitation resulted in higher admixture proportions, likely mediated by the effects of spring precipitation on the expression of traits that determine premating reproductive isolation. Climate-driven hybridization dynamics may be particularly affected by global change, potentially reshaping species boundaries and adaptation to novel environments. Competing Interests: Competing interests statement:The authors declare no competing interest. |
| Databáze: | MEDLINE |
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