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首页> 外文期刊>Evolution Letters >Morning glory species co‐occurrence is associated with asymmetrically decreased and cascading reproductive isolation
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Morning glory species co‐occurrence is associated with asymmetrically decreased and cascading reproductive isolation

机译：早上荣耀物种共同发生与非对称下降和级联的生殖隔离相关

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Hybridization between species can affect the strength of the reproductive barriers that separate those species. Two extensions of this effect are (1) the expectation that asymmetric hybridization or gene flow will have asymmetric effects on reproductive barrier strength and (2) the expectation that local hybridization will affect only local reproductive barrier strength and could therefore alter within-species compatibility. We tested these hypotheses in a pair of morning glory species that exhibit asymmetric gene flow from highly selfing Ipomoea lacunosa into mixed-mating Ipomoea cordatotriloba in regions where they co-occur. Because of the direction of this gene flow, we predicted that reproductive barrier strength would be more strongly affected in I. cordatotriloba than I. lacunosa. We also predicted that changes to reproductive barriers in sympatric I. cordatotriloba populations would affect compatibility with allopatric populations of that species. We tested these predictions by measuring the strength of a reproductive barrier to seed set across the species' ranges. Consistent with our first prediction, we found that sympatric and allopatric I. lacunosa produce the same number of seeds in crosses with I. cordatotriloba, whereas crosses between sympatric I. cordatotriloba and I. lacunosa are more successful than crosses between allopatric I. cordatotriloba and I. lacunosa. This difference in compatibility appears to reflect an asymmetric decrease in the strength of the barrier to seed set in sympatric I. cordatotriloba, which could be caused by I. lacunosa alleles that have introgressed into I. cordatotriloba. We further demonstrated that changes to sympatric I. cordatotriloba have decreased its ability to produce seeds with allopatric populations of the same species, in line with our second prediction. Thus, in a manner analogous to cascade reinforcement, we suggest that introgression associated with hybridization not only influences between-species isolation but can also contribute to isolation within a species.? 2020 The Authors. Evolution Letters published by Wiley Periodicals, LLC on behalf of Society for the Study of Evolution (SSE) and European Society for Evolutionary Biology (ESEB).
机译：物种之间的杂交可以影响分开这些物种的生殖屏障的强度。这种效果的两个延伸是（1）期望不对称杂交或基因流量对生殖阻隔强度的不对称影响和（2）局部杂交将仅影响局部生殖阻隔强度，因此可以改变物种内容性的效果。我们在一对早晨的辉煌物种中测试了这些假设，将非对称基因流入从高度自拍的IPOMOEA插图流入它们共同发生的区域中的混合交配的IPOMOEA CORDATRILOBA。由于这种基因流动的方向，我们预测，生殖阻隔强度在I. Cortatotriloba比I. Levunosa更受强烈影响。我们还预测，对称Indpatric I.生殖障碍的变化.CortaTroba种群将影响与该物种的各种群体的兼容性。通过测量跨物种范围的种子集的生殖屏障的强度来测试这些预测。与我们的第一预测一致，我们发现Sympatric和Allopatric I. Levunosa与I. Cortatotriloba产生相同数量的杂交种子，而Sympatric I.Cortatotriloba之间的交叉在Allopatric I. Cortatriloba和Allopatric I. Cortatotriloba之间的交叉横跨。 I. Lavunosa。这种相容性的这种差异似乎反映了在SympaTric I.Sindatotriloba中的种子中的屏障强度的不对称降低，这可能是由I.含有I. Cortatotriloba血清瘤的含量引起的。我们进一步证明了对称I.SympaTric I.Sindatotriloba的变化降低了其在第二种预测中符合我们的第二种预测的各种种类的种子的能力。因此，以类似于梯级增强的方式，我们表明与杂交相关的趋势不仅影响物种之间的分离，而且还可以有助于在物种中隔离。 2020作者。 Wiley Hearyichs，LLC发布的演变信代表进化（SSE）和欧洲进化生物学学会（ESEB）的研究。

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