Exploring the generic delimitation of Phyllagathis and Bredia (Melastomataceae): A combined nuclear and chloroplast DNA analysis
Exploring the generic delimitation of Phyllagathis and Bredia (Melastomataceae): A combined nuclear and chloroplast DNA analysis
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探索 Phyllagathis 和 Bredia（野牡丹科）的属属界限：核 DNA 和叶绿体 DNA 组合分析
DOI：
10.1111/jse.12451
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发表时间：
2019-05-01
影响因子：
3.7
通讯作者：
Liu, Ying
中科院分区：
文献类型：
--
作者：
Zhou, Qiu-Jie;Lin, Che-Wei;Liu, Ying
Phyllagathis Blume和Bredia Blume（Sonerileae s.l.，木莲科（Mingalataceae）是亚洲两个形态相似、地理分布重叠的近缘属。它们的属界限和系统发育关系远未完全了解。在这里，我们提出了一个分子系统发育调查的两个属使用核核糖体内转录间隔区和叶绿体（trnV-trnM）序列数据。Sonerileae s.l.包括在分析中，与Phyllagathis和Bredia密集采样，以涵盖其地理范围和形态多样性。我们确定了14个支持的物种集群内Sonerileae s.l.-Medinilla。系统发育分析和形态特征重建清楚地表明了海桑族属划分的混乱。许多传统上用于属的划分的字符是高度同源的。Bredia和Phyllagathis，以及Allomorphus，Anerincleistus，Fordiophyton和Oxyspora，被发现是非单系的。根据目前的定义，Bredia包含两组具有不同系统发育关系的物种。Bredia应该重新界定，以排除Bredia-Phyllagathis分支I，并容纳Bredia-Phyllagathis分支II，因为该属的模式包括在后者分支中。在Phyllagathis采样的大多数物种分布在整个系统发育树的8个支持分支。Phyllagathis的类型显示与Phyllagathis的其他成员或其推定的亲属没有密切联系。Phyllagathis，目前的限制，是异质的，包括多个进化谱系。由于核核糖体内转录间隔区和叶绿体trnV-trnM的序列数据未能解决这些谱系之间的系统发育关系，Phyllagathis的正式分类调整被推迟，直到进一步的证据可以收集。
Phyllagathis Blume and Bredia Blume (Sonerileae s.l., Melastomataceae) are two closely related Asian genera with similar morphology and overlapping geographical range. Their generic circumscription and phylogenetic relationships are far from fully understood. We present here a molecular phylogenetic investigation for the two genera using nuclear ribosomal internal transcribed spacer and chloroplast (trnV‐trnM) sequence data. Seventeen genera of Sonerileae s.l. were included in the analyses, with Phyllagathis and Bredia densely sampled to cover their geographical range and morphological diversity. We identified 14 well supported species clusters within Sonerileae s.l.–Medinilla. Phylogenetic analyses together with reconstruction of morphological characters clearly indicated the taxonomic mess in generic delimitation of Sonerileae s.l. Many of the characters traditionally used in generic delimitation were highly homoplasious. Bredia and Phyllagathis, as well as Allomorphia, Anerincleistus, Fordiophyton, and Oxyspora, were revealed to be non‐monophyletic. Bredia, as currently defined, contains two groups of species with different phylogenetic affiliations. Bredia should be recircumscribed to exclude the Bredia–Phyllagathis clade I and accommodate the Bredia–Phyllagathis clade II as the type of the genus is included in the latter clade. Most species sampled in Phyllagathis spread across eight well supported clades throughout the phylogenetic tree. The type of Phyllagathis showed no close affiliation with other members of Phyllagathis nor its putative relatives. Phyllagathis, as presently circumscribed, is heterogeneous, encompassing multiple evolutionary lineages. As sequence data of nuclear ribosomal internal transcribed spacer and chloroplast trnV‐trnM failed to resolve the phylogenetic relationships among these lineages, the formal taxonomic adjustment of Phyllagathis is postponed until further evidence can be gathered.