DNA phylogeny reveals polyphyly of Phoma section Peyronellaea and multiple taxonomic novelties
DNA phylogeny reveals polyphyly of Phoma section Peyronellaea and multiple taxonomic novelties
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DOI：
10.3852/08-199
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发表时间：
2009-05-01
期刊：
影响因子：
2.8
通讯作者：
Crous, Pedro W.
中科院分区：
文献类型：
--
作者：
Aveskamp, Maikel M.;Verkley, Gerard J. M.;Crous, Pedro W.
异形属的物种通常从广泛的生态位中分离出来。众所周知，由于形态特征的缺乏和这些在琼脂培养基上培养时的可塑性，它们很难识别。与Phoma剖面相关的peyronellae物种以产生双衣原体孢子为典型，因此在分类单元划分中具有额外的特征。然而，这部分的分类仍然没有完全理解。此外，在Phoma的其他部分也知道这种衣孢子的产生。从ITS、肌动蛋白和β -微管蛋白三个位点生成DNA序列，以阐明产生二tyochlamydo孢子的Phoma类群的系统发育。结果不能支持Peyronellaea作为一个分类实体。Dictyochlamdospore的形成似乎是Phoma进化过程中多次发展或消失的特征。此外，在多基因分析的基础上，我们发现了5个新物种，另外5个物种需要进行分类修改以与所观察到的遗传变异相一致。
Species of the anamorph genus Phoma are commonly isolated from a wide range of ecological niches. They are notoriously difficult to identify due to the paucity of morphological features and the plasticity of these when cultivated on agar media. Species linked to Phoma section Peyronellaea are typified by the production of dictyochlamydospores and thus have additional characters to use in taxon delineation. However, the taxonomy of this section is still not fully understood. Furthermore the production of such chlamydospores also is known in some other sections of Phoma. DNA sequences were generated from three loci, namely ITS, actin, and beta-tubulin, to clarify the phylogeny of Phoma taxa that produce dictyochlamydospores. Results were unable to support section Peyronellaea as a taxonomic entity. Dictyochlamdospore formation appears to be a feature that developed, or was lost, many times during the evolution of Phoma. Furthermore, based on the multigene analyses, five new Phoma species could be delineated while a further five required taxonomic revision to be consistent with the genetic variation observed.