Rapid evolution of hybrid breakdown following recent divergence with gene flow in Senecio species on Mount Etna, Sicily.
Rapid evolution of hybrid breakdown following recent divergence with gene flow in Senecio species on Mount Etna, Sicily.
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在持续的基因流动下，新生物种如何在物种形成过程中进化出生殖隔离？杂交谱系如何成为稳定的杂交物种？虽然常用的基因组方法提供了一种间接的方式来确定物种的不相容性因素，从种间杂交产生的合成杂种允许直接精确定位的表型性状参与不相容性和性状，是潜在的适应性杂交种。本文报道了近缘千里光与千里光杂交的表型变异和杂种失败分析。chalcifolius和它们的同倍体杂种S.肮脏的前两个物种代表一个可能的情况下，最近（<200千公里）的物种形成与基因流驱动的适应高海拔和低海拔的埃特纳山，西西里。当这些物种形成可生存和可繁殖的杂交种时，尚不清楚它们是否已经开始进化出生殖不相容性。我们的分析代表了第一次研究的表型变异和杂交故障涉及多个千里光杂交家庭。它揭示了多种性状的广泛变异，包括以前在合成杂交种中未记录的性状。叶的形状，S。aethnensis和S. chalcifolius在F_2中变异较大，而在S.肮脏的我们的研究表明，种间不相容性可以迅速发展，尽管正在进行的基因流之间的物种。进一步的工作是必要的，以了解这些不相容性的遗传基础和它们在物种形成与基因流的作用。
How do nascent species evolve reproductive isolation during speciation with on-going gene flow? How do hybrid lineages become stabilised hybrid species? While commonly used genomic approaches provide an indirect way to identify species incompatibility factors, synthetic hybrids generated from interspecific crosses allow direct pinpointing of phenotypic traits involved in incompatibilities and the traits that are potentially adaptive in hybrid species. Here we report the analysis of phenotypic variation and hybrid breakdown in crosses between closely-related Senecio aethnensis and S. chrysanthemifolius, and their homoploid hybrid species, S. squalidus. The two former species represent a likely case of recent (<200 ky) speciation with gene flow driven by adaptation to contrasting conditions of high- and low-elevations on Mount Etna, Sicily. As these species form viable and fertile hybrids, it remains unclear whether they have started to evolve reproductive incompatibility. Our analysis represents the first study of phenotypic variation and hybrid breakdown involving multiple Senecio hybrid families. It revealed wide range of variation in multiple traits, including the traits previously unrecorded in synthetic hybrids. Leaf shape, highly distinct between S. aethnensis and S. chrysanthemifolius, was extremely variable in F2 hybrids, but more consistent in S. squalidus. Our study demonstrates that interspecific incompatibilities can evolve rapidly despite on-going gene flow between the species. Further work is necessary to understand the genetic bases of these incompatibilities and their role in speciation with gene flow.
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影响因子：
10.7
作者：
Chapman MA;Hiscock SJ;Filatov DA
通讯作者：
Filatov DA
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ABBOTT, RJ;IRWIN, JA
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影响因子：
3
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作者：
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