Ingvarsson, Pär
- Department of Plant Biology, Swedish University of Agricultural Sciences
Research article2023Peer reviewed
Tian, Yang; Liu, Shu-Yu; Ingvarsson, Par K.; Zhao, Dan-Dan; Wang, Li; Abuduhamiti, Baoerjiang; Cai, Jin-Feng; Wu, Zhi-Qiang; Zhang, Jian-Guo; Wang, Zhao-Shan
Identifying the factors that cause reproductive isolation and their relative importance in species divergence is crucial to our understanding of speciation processes. In most species, natural selection is commonly considered to play a large role in driving speciation. Based on whole genome re-sequencing data from 27 Populus alba and 28 Populus adenopoda individuals, we explored the factors related to reproductive isolation of these two closely related species. The results showed that the two species diverged similar to 5-10 million years ago (Ma), when the Qinghai-Tibet Plateau reached a certain height and the inland climate of the Asian continent became arid. In highly differentiated genomic regions, the relative divergence (F-ST) and absolute divergence (d(xy)) were significantly higher than the genomic background, theta pi and shared polymorphisms decreased whereas fixed differences increased, which indicated that natural selection played a key role in the reproductive isolation of the two species. In addition, we found several genes that were related to reproduction that may be involved in explaining the reproductive isolation. Using phylogenetic trees resolved from haplotype data of Populus tomentosa and P. adenopoda, the maternal origin of P. tomentosa from P. adenopoda was likely to be located in Hubei and Chongqing Provinces.
demographic histories; natural selection; P. adenopoda; P. tomentosa; P. alba; whole genome re-sequencing
Journal of Systematics and Evolution
2023, Volume: 61, number: 5, pages: 852-867 Publisher: WILEY
Biological Systematics
Evolutionary Biology
DOI: https://doi.org/10.1111/jse.12911
https://res.slu.se/id/publ/119927