A re-evaluation of Diaporthe: refining the boundaries of species and species complexes

IF 24.5 1区 生物学 Q1 MYCOLOGY
Asha J. Dissanayake, Jin-Tao Zhu, Ya-Ya Chen, Sajeewa S. N. Maharachchikumbura, Kevin D. Hyde, Jian-Kui Liu
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Abstract

Diaporthe is an important plant pathogenic genus, which also occurs as endophytes and saprobes. Many Diaporthe species that are morphologically similar proved to be genetically distinct. The current understanding of Diaporthe taxonomy by applying morphological characters, host associations and multi-gene phylogeny are problematic leading to overestimation/underestimation of species numbers of this significant fungal pathogenic genus. Currently, there are no definite boundaries for the accepted species. Hence, the present study aims to re-structure the genus Diaporthe, based on single gene phylogenies (ITS, tef, tub, cal and his), multi-gene phylogeny justified by applying GCPSR (Genealogical Concordance Phylogenetic Species Recognition) methodology as well as the coalescence-based models (PTP—Poisson Tree Processes and mPTP—multi-rate Poisson Tree Processes). Considering all available type isolates of Diaporthe, the genus is divided into seven sections while boundaries for 13 species and 15 species-complexes are proposed. To support this re-assessment of the genus, 82 Diaporthe isolates obtained from woody hosts in Guizhou Province in China were investigated and revealed the presence of two novel species and 17 previously known species. Synonymies are specified for 31 species based on molecular data and morphological studies. Dividing Diaporthe into several specific sections based on phylogenetic analyses can avoid the construction of lengthy phylogenetic trees of the entire genus in future taxonomic studies. In other words, when one conducts research related to the genus, only species from the appropriate section need to be selected for phylogenetic analysis.

Abstract Image

重新评价 Diaporthe:完善物种和物种复合体的界限
Diaporthe 是一种重要的植物病原菌属,也以内生菌和病原菌的形式存在。事实证明,许多形态上相似的 Diaporthe 物种在基因上是不同的。目前通过形态特征、寄主关系和多基因系统发育对 Diaporthe 分类的理解存在问题,导致对这一重要真菌病原菌属的物种数量估计过高或过低。目前,公认的种没有明确的界限。因此,本研究旨在根据单基因系统发育(ITS、tef、tub、cal 和 his)、应用 GCPSR(谱系一致系统发育物种识别)方法证明的多基因系统发育以及基于凝聚的模型(PTP-泊松树过程和 mPTP-多速率泊松树过程),重新构建 Diaporthe 属。考虑到 Diaporthe 的所有可用模式分离物,该属被划分为 7 个部分,同时提出了 13 个种和 15 个种-复合体的边界。为了支持对该属的重新评估,对从中国贵州省木质寄主中获得的 82 个 Diaporthe 分离物进行了调查,发现了 2 个新种和 17 个以前已知的种。根据分子数据和形态学研究,为 31 个种确定了同名。根据系统发育分析将 Diaporthe 分成几个特定的部分,可以避免在未来的分类研究中构建冗长的全属系统发育树。换句话说,在进行与该属相关的研究时,只需选择相应部分的物种进行系统发育分析。
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来源期刊
Fungal Diversity
Fungal Diversity 生物-真菌学
CiteScore
44.80
自引率
9.90%
发文量
17
审稿时长
6 months
期刊介绍: Fungal Diversity, the official journal of the Kunming Institute of Botany of the Chinese Academy of Sciences, is an international, peer-reviewed journal covering all aspects of mycology. It prioritizes papers on biodiversity, systematic, and molecular phylogeny. While it welcomes novel research and review articles, authors aiming to publish checklists are advised to seek regional journals, and the introduction of new species and genera should generally be supported by molecular data. Published articles undergo peer review and are accessible online first with a permanent DOI, making them citable as the official Version of Record according to NISO RP-8-2008 standards. Any necessary corrections after online publication require the publication of an Erratum.
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