Institute of Ecology and Evolution, University of Edinburgh, Edinburgh EH9 3FL, United Kingdom.
Tree of Life, Wellcome Trust Genome Campus, Hinxton CB10 1RQ, United Kingdom.
Proc Natl Acad Sci U S A. 2023 Apr 18;120(16):e2220261120. doi: 10.1073/pnas.2220261120. Epub 2023 Apr 11.
Natural hybridization can have a profound evolutionary impact, with consequences ranging from the extinction of rare taxa to the origin of new species. Natural hybridization is particularly common in plants; however, our understanding of the general factors that promote or prevent hybridization is hampered by the highly variable outcomes in different lineages. Here, we quantify the influence of different predictors on hybrid formation across species from an entire flora. We combine estimates of hybridization with ecological attributes and a new species-level phylogeny for over 1,100 UK flowering plant species. Our results show that genetic factors, particularly parental genetic distance, as well as phylogenetic position and ploidy, are key determinants of hybrid formation, whereas many other factors such as range overlap and genus size explain much less variation in hybrid formation. Overall, intrinsic genetic factors shape the evolutionary and ecological consequences of natural hybridization across species in a flora.
自然杂交可以产生深远的进化影响，其后果范围从稀有分类群的灭绝到新物种的起源。自然杂交在植物中尤为常见；然而，由于不同谱系的结果高度可变，我们对促进或阻止杂交的一般因素的理解受到了阻碍。在这里，我们量化了不同预测因子对整个植物区系中物种杂交形成的影响。我们将杂交的估计值与生态属性以及超过 1100 种英国开花植物的新种水平系统发育相结合。我们的结果表明，遗传因素，特别是亲本遗传距离，以及系统发育位置和倍性，是杂交形成的关键决定因素，而许多其他因素，如范围重叠和属大小，解释了杂交形成中变化的很小一部分。总的来说，内在遗传因素塑造了植物区系中物种自然杂交的进化和生态后果。
