Strong reproductive isolation despite occasional hybridization between a widely distributed and a narrow endemic Rhododendron species.
Strong reproductive isolation despite occasional hybridization between a widely distributed and a narrow endemic Rhododendron species.
复制标题
尽管偶尔分布和狭窄的流行杜鹃花种之间偶尔进行杂交，但强烈的生殖分离。
DOI：
10.1038/srep19146
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发表时间：
2016-01-11
影响因子：
4.6
通讯作者：
Marczewski T
中科院分区：
文献类型：
--
作者：
Ma YP;Xie WJ;Sun WB;Marczewski T
生殖隔离（RI）对物种形成起着重要作用，但评估生命周期各个阶段的生殖障碍仍然具有挑战性。在植物中，大多数针对这一主题的研究都集中在世代时间短的草药上。本研究试图量化几个繁殖障碍之间的杂交种对长寿的木本杜鹃。与以往的研究结果相一致，前合子生殖障碍的贡献总RI比后合子生殖障碍。特别是在更广泛的物种的地理隔离是一个重要的障碍，传粉者的恒定性，特别是在这两个物种的RI。除了强大的前合子生殖障碍，后合子生殖障碍是相当大的，并有不对称的倾向，有利于一个物种作为母本。总体而言，尽管偶尔杂交，本研究提供了证据，强RI之间的R。cyanocarpum和R. delavayi。
Reproductive isolation (RI) plays an important role for speciation, but assessing reproductive barriers at all life-cycle stages remains challenging. In plants, most studies addressing the topic have been focusing on herbs with short generation times. The present study attempted to quantify several reproductive barriers between a hybridizing species pair of long-lived woody rhododendrons. Consistent with findings of previous studies, pre-zygotic reproductive barriers contributed more to total RI than post-zygotic reproductive barriers. Especially in the more widespread species geographic isolation was an important barrier, and pollinator constancy contributed exceptionally to RI in both species. Additionally to strong pre-zygotic reproductive barriers, post-zygotic reproductive barriers were considerable, and had asymmetric tendencies favoring one of the species as maternal parent. Overall, despite occasional hybridization, the present study provides evidence for strong RI between R. cyanocarpum and R. delavayi.