The sections of Alternaria: formalizing species-group concepts
The sections of Alternaria: formalizing species-group concepts
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DOI：
10.3852/12-249
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发表时间：
2013-05-01
期刊：
影响因子：
2.8
通讯作者：
Pryor, Barry M.
中科院分区：
文献类型：
--
作者：
Lawrence, Daniel P.;Gannibal, Philipp B.;Pryor, Barry M.
链格孢属及其近缘属的系统学研究传统上以分生孢子和产孢器的特征为基础。这种强调形态学在重建有机体的关系，导致了在链格孢属和相关属Stemphyelia，Embellisia，Nimbya和Ulocladium的一些分类群的分类不确定性和流量。本研究采用了分子系统发育的方法进行系统分辨率，并纳入了广泛的分类单元采样（n = 176种）代表10个属和10个蛋白质编码位点的分析。系统发育分析的基础上，这些基因揭示了8个不同的无性系链格孢属集群的姐妹群无性并系属Ulocladium，而类群与已知的teleomorphs目前被限制为链格孢属（没食子属种组）集群之间的属，也有代表与已知teleomorphs。本工作建议将链格孢属的8个支持较好的无性系提升到组的分类地位。讨论了链格孢属与近缘属之间的进化关系。
The systematics of Alternaria and allied genera traditionally has been based on the characteristics of conidia and the sporulation apparatus. This emphasis on morphology in the reconstruction of organismal relationships has resulted in taxonomic uncertainty and flux for a number of taxa in Alternaria and the related genera Stemphylium, Embellisia, Nimbya and Ulocladium. The present study used a molecular phylogenetic approach for systematic resolution and incorporated extensive taxon sampling (n = 176 species) representing 10 genera and analyses of 10 protein-coding loci. Phylogenetic analyses based on five of these genes revealed eight distinct asexual lineages of Alternaria that cluster as the sister group to the asexual paraphyletic genus Ulocladium, while taxa with known teleomorphs currently circumscribed as Alternaria (the infectoria species-group) cluster among genera that also have representatives with known teleomorphs. This work proposes to elevate the eight well supported asexual lineages of Alternaria to the taxonomic rank of section. Evolutionary relationships among Alternaria and closely related genera are discussed.