Historical introgression among the species of Rodgersia (Saxifragaceae) in mountainous forests of southwest China
Historical introgression among the species of Rodgersia (Saxifragaceae) in mountainous forests of southwest China
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中国西南山地森林虎耳草科植物的历史渐渗
DOI：
10.1016/j.ympev.2018.03.002
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发表时间：
2018
影响因子：
4.1
通讯作者：
Hang Sun
中科院分区：
文献类型：
--
作者：
Xiangguang Ma;Wenguang Sun;Hang Sun
本研究利用遗传数据和生态位模型探讨了中国中西部地区灯心草属（虎耳草科）物种间可能存在的历史渐渗现象。在R.七叶树、七叶树R.接骨木（Sambucifolia）和丽江（LJ）接骨木居群（R. pinnata的叶绿体单倍型，其单倍型与不同种的叶绿体单倍型关系最密切。ITS区克隆未发现R. Aesculifolia和其余的物种。R. AesculifoliaandR.接骨木（orR. pinnata）似乎是最合理的解释，根据地理格局和假定的渗入叶绿体单倍型的衍生地位，也从形态学证据。也发现了基因渗入。接骨木属R. pinnata和R.云南的henricii.频繁的基因交换可能促进了该属植物叶片形状的多样性。生态位模拟表明，更新世寒冷时期的范围转移后，过去的二次接触可能提供了机会，古老的渗入betweenR。Aesculifolia和邻近种。
In the present study, we used genetic data and ecological niche modelling to explore possible historical introgressions among the species ofRodgersia(Saxifragaceae) in central-southwest China. Markedly differentiated chloroplast haplotypes were found inR. aesculifolia,R. sambucifoliaand the Lijiang (LJ) population ofR. pinnata, respectively, and differentiated chloroplast haplotypes within each of them showed the closest relationships with haplotypes from different species. ITS cloning did not reveal any shared ribotype betweenR. aesculifoliaand the remaining species. Historical introgression betweenR. aesculifoliaandR. sambucifolia(orR. pinnata) seems to be the most plausible explanation according to the geographical pattern and derivative status of putative introgressed chloroplast haplotypes, and also from morphological evidence. Introgressions were also found amongR. sambucifolia,R. pinnata, andR. henriciifrom Yunnan. Frequent gene exchanges may have promoted the diversity of leaf shapes in this genus. Ecological niche modelling indicated that past secondary contact following range shifts during Pleistocene cold periods may have provided opportunities for ancient introgression betweenR. aesculifoliaand adjacent species.