New infrageneric classification of Abies in light of molecular phylogeny and high diversity in western North America
New infrageneric classification of Abies in light of molecular phylogeny and high diversity in western North America
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根据北美西部的分子系统发育和高度多样性对冷杉进行新的属下分类
DOI：
10.1111/jse.12458
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发表时间：
2018
影响因子：
3.7
通讯作者：
Zhang Xian-Chun
中科院分区：
文献类型：
--
作者：
Xiang Qiao-Ping;Wei Ran;Zhu Yan-Mei;Harris A. J.;Zhang Xian-Chun
冷杉属。是松科最多样化的分支之一，约有50种。最近冷杉的系统发育研究利用核和质体基因组的区域普遍支持最近的分类。然而，我们之前已经表明，在一些情况下，分部成员应该修改，并且需要更多的物种来产生一个稳健的非谱系分类。因此，我们利用迄今为止最全面的类群样本（全世界52个类群）和5个叶绿体基因区和1个单拷贝核基因（LFY）对冷杉的系统发育分类进行了修订。我们的系统发育分析，包括最大简约性、最大似然性和贝叶斯推理，得出了与先前研究一致的7个良好支持的谱系。我们的分类修订整合了这里提出的系统发生以及其他研究的系统发生。我们合并了pseudoopicea教派与Momi教派，确认了Abies教派与Piceaster教派的合并，以及Grandis教派与Oiamel教派的合并。我们通过排除A. kawakamii (Hayata) T. Itô确认了Balsamea教派，我们怀疑它的起源与古代杂交有关。每个部分都提供了简短的形态描述，以及它的地理分布和公认的物种名称列表。七个部分中的五个主要由北美西部的物种组成，特别是在加利福尼亚植物区。系统发育结果表明，北美西部是冷杉谱系多样性异常高的地方，这进一步证实了角质层形态和基于长度差异的内部转录间隔基因型。
Abies Mill. represents one of the most diverse lineages in Pinaceae with ca. 50 species. Recent phylogenetic studies of Abies using regions of the nuclear and plastid genomes generally support recent classifications. However, we have previously shown that in several cases sectional memberships should be revised, and more species are needed to generate a robust infrageneric classification. Therefore, we present a revision of Abies taxonomy based on phylogeny using the most comprehensive taxon sampling (52 taxa worldwide) to date and five chloroplast gene regions and one single‐copy nuclear gene (LFY). Our phylogenetic analyses, including maximum parsimony, maximum likelihood, and Bayesian inference, yield seven well‐supported lineages that are consistent with previous studies. Our taxonomic revision integrates the phylogenies presented here as well as those from other studies. We merged sect. Pseudopicea with sect. Momi, recognized the merger of sect. Abies with sect. Piceaster, and sect. Grandis with sect. Oiamel. We recognized sect. Balsamea by excluding A. kawakamii (Hayata) T. Itô and we suspect that ancient hybridization was involved in its origin. A short morphological description is provided for each section, as well as its geographic distribution and list of accepted names of species. Five of the seven sections consist primarily of species in western North America, especially within the California Floristic Province. Phylogenetic results show that western North America is home to an exceptionally high diversity of fir lineages, which is further corroborated by the cuticle morphology and internal transcribed spacer genotypes based on the length differences.