IMA Fungus 9(1): 49-73, doi: 10.5598/imafungus.2018.09.01.05
Ustilago species causing leaf-stripe smut revisited
Julia Kruse‡, Marco Thines§, Horst Zimmermann|, Friedemann Klenke, Udo Richter, Heidrun Richter, Marco Thines¶‡ Goethe University Frankfurt am Main, Faculty of Biosciences, Institute of Ecology, Evolution and Diversity, Frankfurt am Main, Germany§ Goethe University, Frankfurt am Main, Germany| Cluster for Integrative Fungal Research (IPF), Frankfurt am Main, Germany¶ Biodiversity and Climate Research Centre (BiK-F), Frankfurt (Main), Germany
© Julia Kruse, Marco Thines, Horst Zimmermann, Friedemann Klenke, Udo Richter, Heidrun Richter, Marco Thines. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY-NC 4.0), which permits to copy and distribute the article for non-commercial purposes, provided that the article is not altered or modified and the original author and source are credited. Citation:
Kruse J, Thines M, Zimmermann H, Klenke F, Richter U, Richter H, Thines M (2018) Ustilago species causing leaf-stripe smut revisited. IMA Fungus 9(1): 49-73. https://doi.org/10.5598/imafungus.2018.09.01.05 |  |
Abstract
Leaf-stripe smuts on grasses are a highly polyphyletic group within Ustilaginomycotina, occurring in three genera, Tilletia, Urocystis, and Ustilago. Currently more than 12 Ustilago species inciting stripe smuts are recognised. The majority belong to the Ustilago striiformis-complex, with about 30 different taxa described from 165 different plant species. This study aims to assess whether host distinct-lineages can be observed amongst the Ustilago leaf-stripe smuts using nine different loci on a representative set. Phylogenetic reconstructions supported the monophyly of the Ustilago striiformis-complex that causes leaf-stripe and the polyphyly of other leaf-stripe smuts within Ustilago. Furthermore, smut specimens from the same host genus generally clustered together in well-supported clades that often had available species names for these lineages. In addition to already-named lineages, three new lineages were observed, and described as new species on the basis of host specificity and molecular differences: namely Ustilago jagei sp. nov. on Agrostis stolonifera, U. kummeri sp. nov. on Bromus inermis, and U. neocopinata sp. nov. on Dactylis glomerata.
Keywords
DNA-based taxonomy, host specificity, molecular species discrimination, multigene phylogeny, new taxa, species complex, Ustilaginaceae