Zhu Zhang-Ming, Gao Xin-Fen, Fougère-Danezan Marie
Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, Sichuan 610041, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, Sichuan 610041, China.
Mol Phylogenet Evol. 2015 Jun;87:50-64. doi: 10.1016/j.ympev.2015.03.014. Epub 2015 Mar 23.
Rosa sections Chinenses and Synstylae contain approximately 39 wild species mainly distributed in East Asia and are closely related according to previous studies. But the specific relationships within these two sections were still obscure due to limited sampling, low genetic variation of molecular markers, and complex evolutionary histories. In this study, we used four chloroplast (ndhC-trnV, ndhF-rpl32, ndhJ-trnF and psbJ-petA) and two nuclear (ribosomal ITS and GAPDH) markers with an extensive geographic and taxonomic sampling to explore their evolutionary history. Our phylogenetic analyses suggested that Rosa sections Chinenses and Synstylae defined in traditional taxonomic system are not monophyletic and close to sections Caninae and Gallicanae. Additionally, our results showed incongruence between chloroplast and nuclear markers, and the patterns of incongruence might be due to ancient hybridization (genetic introgression). One putative hybrid species and three samples identified as interspecific hybrids are further discussed in terms of topological incongruence, biological characters and distribution patterns.
蔷薇属的月季组（Section Chinenses）和合柱组（Section Synstylae）包含约39个野生种，主要分布于东亚，根据以往研究它们亲缘关系密切。但由于取样有限、分子标记的遗传变异低以及复杂的进化历史，这两个组内的具体关系仍不明确。在本研究中，我们使用了四个叶绿体标记（ndhC-trnV、ndhF-rpl32、ndhJ-trnF和psbJ-petA）和两个核标记（核糖体ITS和GAPDH），进行了广泛的地理和分类取样，以探究它们的进化历史。我们的系统发育分析表明，传统分类系统中定义的蔷薇属月季组和合柱组并非单系类群，且与犬蔷薇组（Section Caninae）和法国蔷薇组（Section Gallicanae）相近。此外，我们的结果显示叶绿体和核标记之间存在不一致性，这种不一致模式可能是由于古老的杂交（基因渐渗）所致。根据拓扑结构不一致性、生物学特征和分布模式，进一步讨论了一个推定的杂交种和三个被鉴定为种间杂种的样本。
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