Abstract
In plant pathology, the correct naming of a species is essential for determining the causal agents of disease. Species names not only serve the general purpose of concise communication, but also are critical for effective plant quarantine, preventing the introduction of new pathogens into a territory. Many phytopathogenic genera have multiple species and, in several genera, disagreements between the multiple prevailing species concept definitions result in numerous cryptic species. Some of these species were previously called by various names; forma speciales (specialised forms), subspecies, or pathotypes. However, based on new molecular evidence they are being assigned into new species. The frequent name changes and lack of consistent criteria to delineate cryptic species, species, subspecies, forms, and races create increasing confusion, often making communication among biologists arduous. Furthermore, such ambiguous information can convey misleading evolutionary concepts and species boundaries. The aim of this paper is to review these concepts, clarify their use, and evaluate them by referring to existing examples. We specifically address the question, “Do plant pathogens require a different ranking system?” We conclude that it is necessary to identify phytopathogens to species level based on data from multiple approaches. Furthermore, this identification must go beyond species level to clearly classify hitherto known subspecies, forms and races. In addition, when naming phytopathogenic genera, plant pathologists should provide more information about geographic locations and host ranges as well as host specificities for individual species, cryptic species, forms or races. When describing a new phytopathogen, we suggest that authors provide at least three representative strains together with pathogenicity test results. If Koch’s postulates cannot be fulfilled, it is necessary to provide complementary data such as associated disease severity on the host plant. Moreover, more sequenced collections of species causing diseases should be published in order to stabilise the boundaries of cryptic species, species, subspecies, forms, and races.
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Acknowledgements
We would like to thank the Thailand Research Fund, Grant RDG6130001 entitled “Impact of climate change on fungal diversity and biogeography in the Greater Mekong Subregion”. Kevin D Hyde thanks Chiang Mai University for the award of a Visiting Professor. Ishara S Manawasinghe thank Prof Marco Thines for guiding the development of this paper by providing valuable ideas and comments. Alan JL Phillips acknowledges the support from UIDB/04046/2020 and UIDP/04046/2020 Centre grants from FCT, Portugal (to BioISI).
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ISM and KDH conceived the basic idea. ISM, AJLP and JX developed the outline. ISM, ŁS, DLH, AK, wrote the manuscript. JW created the graphics in the manuscript. AJLP, JX, AB, MT, ŁS, KDH, JY, RC, ZD, ML, JW revised the manuscript. All authors read and approved the final manuscript.
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Manawasinghe, I.S., Phillips, A.J.L., Xu, J. et al. Defining a species in fungal plant pathology: beyond the species level. Fungal Diversity 109, 267–282 (2021). https://doi.org/10.1007/s13225-021-00481-x
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DOI: https://doi.org/10.1007/s13225-021-00481-x