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    Take-all or nothing

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    Author
    Hernandez-Restrepo, M; Groenewald, JZ; Elliott, ML; Canning, G; McMillan, VE; Crous, PW
    Date
    2016-03-01
    Source Title
    Studies in Mycology
    Publisher
    CENTRAALBUREAU SCHIMMELCULTURE
    University of Melbourne Author/s
    CROUS, PIETER
    Affiliation
    Agriculture and Food Systems
    Metadata
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    Document Type
    Journal Article
    Citations
    Hernandez-Restrepo, M., Groenewald, J. Z., Elliott, M. L., Canning, G., McMillan, V. E. & Crous, P. W. (2016). Take-all or nothing. STUDIES IN MYCOLOGY, 83 (83), pp.19-48. https://doi.org/10.1016/j.simyco.2016.06.002.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/258253
    DOI
    10.1016/j.simyco.2016.06.002
    Abstract
    Take-all disease of Poaceae is caused by Gaeumannomyces graminis (Magnaporthaceae). Four varieties are recognised in G. graminis based on ascospore size, hyphopodial morphology and host preference. The aim of the present study was to clarify boundaries among species and varieties in Gaeumannomyces by combining morphology and multi-locus phylogenetic analyses based on partial gene sequences of ITS, LSU, tef1 and rpb1. Two new genera, Falciphoriella and Gaeumannomycella were subsequently introduced in Magnaporthaceae. The resulting phylogeny revealed several cryptic species previously overlooked within Gaeumannomyces. Isolates of Gaeumannomyces were distributed in four main clades, from which 19 species could be delimited, 12 of which were new to science. Our results show that the former varieties Gaeumannomyces graminis var. avenae and Gaeumannomyces graminis var. tritici represent species phylogenetically distinct from G. graminis, for which the new combinations G. avenae and G. tritici are introduced. Based on molecular data, morphology and host preferences, Gaeumannomyces graminis var. maydis is proposed as a synonym of G. radicicola. Furthermore, an epitype for Gaeumannomyces graminis var. avenae was designated to help stabilise the application of that name.

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