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首页> 外文期刊>Mycologia >A molecular characterization of Cercospora species pathogenic to waterhyacinth and emendation of C-piaropi
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A molecular characterization of Cercospora species pathogenic to waterhyacinth and emendation of C-piaropi

机译：凤眼兰致病性尾孢菌的分子表征和C-piaropi的改良

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摘要

Phylogenetic relationships among isolates of Cercospora species pathogenic to water hyacinth, collected from several geographic regions of the world, were examined by using partial DNA sequences from three protein-coding genes: elongation factor-la, P-tubulin, and histone H3. In cladograms from individual, as well as from combined datasets for 14 isolates, two statistically well supported clades were found: a major clade that included isolates from Brazil, Venezuela, Mexico, Florida (USA), South Africa, and Zambia; and a minor clade restricted to isolates from Texas (USA). Shape and dimensions of conidia were unreliable criteria for taxonomic differentiation of most isolates that composed the two clades. In addition, the ex-type culture of C. rodmanii did not show differences in DNA sequence in relation to the other isolates grouped in the major clade, including some that had conidial size and morphology fitting the description of C. piaropi. Therefore, the separation of these species not only did not have strong phenotypic support, but also did not have support from the phylogenetic analysis. Consequently, the description of C. piaropi is emended herein to include C. rodmanii as a synonym.
机译：通过使用来自三个蛋白质编码基因的部分DNA序列（延伸因子-1a，P-微管蛋白和组蛋白H3），检查了从世界几个地理区域收集的对水葫芦有致病性的Cercospora物种分离株之间的亲缘关系。在来自各个个体以及组合数据集中的14个分离株的进化枝图中，发现了两个统计上得到良好支持的进化枝：一个主要进化枝，包括来自巴西，委内瑞拉，墨西哥，佛罗里达（美国），南非和赞比亚的分离菌;还有一个较小的进化枝，仅限于来自美国得克萨斯州的分离株。分生孢子的形状和大小是组成这两个进化枝的大多数分离株分类学分类的不可靠标准。此外，罗德曼梭菌的前型培养物相对于主要进化枝中的其他分离株没有显示出DNA序列的差异，包括一些具有分生孢子大小和形态的菌株，适合于皮氏梭菌的描述。因此，这些物种的分离不仅没有强大的表型支持，而且没有系统发育分析的支持。因此，本文对C. piaropi的描述进行了修改，以包括罗氏梭菌作为同义词。

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