Department of Plant Protection, School of Agriculture, Shiraz University, Shiraz, Iran.
Department of Plant Protection, College of Agriculture, University of Tehran, Karaj, Iran.
Phytopathology. 2022 Aug;112(8):1630-1639. doi: 10.1094/PHYTO-12-21-0519-R. Epub 2022 Jul 4.
comprises a number of economically important fruit tree pathogens classified within different pathovars. Dozens of nonpathogenic and taxonomically unvalidated strains are also designated as , leading to a complicated taxonomic status in the species. In this study, we have evaluated the whole-genome resources of all available spp. strains designated as in the public databases to refine the members of the species based on DNA similarity indexes and core genome-based phylogeny. Our results show that, of the nine validly described pathovars within , pathotype strains of seven pathovars are taxonomically genuine, belonging to the core clade of the species regardless of their pathogenicity on the host of isolation (thus the validity of pathovar status). However, strains of pv. and pv. do not belong to because of the low DNA similarities between the type strain of the species and the pathotype strains of these two pathovars. Thus, we propose to elevate the two pathovars to the rank of a species as sp. nov. with the type strain CFBP 7408 and sp. nov. with the type strain CFBP 3123. In addition, other mislabeled strains of were scattered within spp. that belong to previously described species or represent novel species that await formal description.
包含了许多经济上重要的果树病原菌，它们被分类为不同的生理小种。还有数十种非致病性和分类上无效的菌株也被指定为 ，导致该物种的分类地位非常复杂。在这项研究中，我们评估了所有可获得的被指定为 的 spp. 菌株的全基因组资源，根据 DNA 相似性指数和基于核心基因组的系统发育关系，对该物种的成员进行了细化。我们的结果表明，在 中，九个有效描述的生理小种中，七个生理小种的病原菌株是真正的分类学上的种，无论它们在宿主分离物上的致病性如何，都属于该物种的核心分支（因此，生理小种状态的有效性）。然而， pv. 和 pv. 的菌株不属于 ，因为该物种的模式株与这两个生理小种的病原菌株之间的 DNA 相似性较低。因此，我们建议将这两个生理小种提升为一个新种，分别命名为 sp. nov. 和 sp. nov. ，其模式株分别为 CFBP 7408 和 CFBP 3123。此外，其他被错误标记的 菌株分布在属于先前描述的种或代表有待正式描述的新种的 spp. 中。
