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Phylogenetic relationships of Cryphonectria and Endothia species, based on DNA sequence data and morphology

机译：基于DNA序列数据和形态学的结C属和内皮属物种的亲缘关系

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The fungal genera Endothia and Cryphonectria include some of the most important pathogens of forest trees. Despite available new technology, no comprehensive comparative study based on DNA sequence data and morphology has been done on the available isolates representing these two genera. The main objectives of this study were to assess the phylogenetic relationships among species of Cryphonectria and Endothia, for which cultures are available, and to establish a taxonomic framework based on DNA sequence and morphological data, which will aid future studies and identification of species in these and related genera. Comparisons were based on sequence variation found in the ITS region of the ribosomal RNA operon and two regions of the P-tubulin gene. In addition, the morphology of these species was examined. The phylogenetic data indicated that Endothia and Cryphonectria reside in two distinct phylogenetic clades. Cryphonectria parasitica, C. macrospora, C. nitschkei, C. eucalypti and C. radicalis represented the Cryphonectria clade. Endothia gyrosa and E. singularis were included in the Endothia clade. An isolate representing E. viridistroma grouped outside the Endothia clade and separately from other groups. Other clades outside the one encompassing Cryphonectria were those represented by the C. cubensis isolates and fungi isolated from Elaeocarpus dentalus originating from New Zealand. These clades could be distinguished from Endothia and Cryphonectria, based on anamorph morphology, stromatal structure and ascospore septation. Cryphonectria and Endothia, therefore, appear to be paraphyletic and taxonomic relationships for these fungi need to be revised.
机译：真菌属的内皮和and属包括一些最重要的森林树木病原体。尽管有可用的新技术，但尚未对代表这两个属的分离株进行基于DNA序列数据和形态的全面比较研究。这项研究的主要目的是评估可利用其进行培养的隐孢子虫和内皮素物种之间的系统发育关系，并基于DNA序列和形态学数据建立分类学框架，这将有助于未来研究和鉴定这些物种中的物种。和相关的属。比较是基于在核糖体RNA操纵子的ITS区域和P-微管蛋白基因的两个区域中发现的序列变异。另外，检查了这些物种的形态。系统发育数据表明，内皮和小C位于两个不同的系统进化进化枝中。寄生的Cryphonectria，C。macrospora，C。nitschkei，C。eucalypti和C.radicalis代表了Cryphonectria进化枝。内皮索氏进化枝中包括陀螺和奇异埃希氏菌。代表E. viridistroma的分离株聚集在内皮索德进化枝外，与其他群体分开。包括C形纲的其他进化枝是以立方体梭状芽胞杆菌分离物和真菌为代表的那些进化枝，所述分离菌和真菌来自新西兰的Elaeocarpus dentalus。根据变形形态，气孔结构和子囊孢子分离，可以将这些进化枝与内皮和蜡and区分开。因此，Cryphonectria和Endothia似乎是共生和分类学上的关系，这些真菌需要进行修改。

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