Pyricularia graminis-tritici, a new pyricularia species causing wheat blast

dc.contributor.authorCastroaguin, V.L.
dc.contributor.authorMoreira, S.I.
dc.contributor.authorPereira, S.S.
dc.contributor.authorBrunner, P.C.
dc.contributor.authorMaciel, J.L.N.
dc.contributor.authorCrous, Pedro W.
dc.contributor.authorMcDonald, B.A.
dc.contributor.authorAlves, E.
dc.contributor.authorCeresini, P.C.
dc.date.accessioned2017-02-09T10:09:45Z
dc.date.available2017-02-09T10:09:45Z
dc.date.issued2016-06-24
dc.description.abstractPyricularia oryzae is a species complex that causes blast disease on more than 50 species of poaceous plants. Pyricularia oryzae has a worldwide distribution as a rice pathogen and in the last 30 years emerged as an important wheat pathogen in southern Brazil. We conducted phylogenetic analyses using 10 housekeeping loci for 128 isolates of P. oryzae sampled from sympatric populations of wheat, rice, and grasses growing in or near wheat fields. Phylogenetic analyses grouped the isolates into three major clades. Clade 1 comprised isolates associated only with rice and corresponds to the previously described rice blast pathogen P. oryzae pathotype Oryza (PoO). Clade 2 comprised isolates associated almost exclusively with wheat and corresponds to the previously described wheat blast pathogen P. oryzae pathotype Triticum (PoT). Clade 3 contained isolates obtained from wheat as well as other Poaceae hosts. We found that Clade 3 is distinct from P. oryzae and represents a new species, Pyricularia graminis-tritici (Pgt). No morphological differences were observed among these species, but a distinctive pathogenicity spectrum was observed. Pgt and PoT were pathogenic and highly aggressive on Triticum aestivum (wheat), Hordeum vulgare (barley), Urochloa brizantha (signal grass), and Avena sativa (oats). PoO was highly virulent on the original rice host (Oryza sativa), and also on wheat, barley, and oats, but not on signal grass. We conclude that blast disease on wheat and its associated Poaceae hosts in Brazil is caused by multiple Pyricularia species. Pyricularia graminis-tritici was recently found causing wheat blast in Bangladesh. This indicates that P. graminis-tritici represents a serious threat to wheat cultivation globally.en_ZA
dc.description.departmentMicrobiology and Plant Pathologyen_ZA
dc.description.librarianam2017en_ZA
dc.description.sponsorshipThis work was funded by FAPESP (São Paulo Research Foundation, Brazil) research grants to P.C. Ceresini (2013/10655-4 and 2015/10453-8), EMBRAPA/Monsanto research grant (Macroprogram II) to J.L.N. Maciel, and research grants from FINEP (Funding Authority for Studies and Projects, Brazil) and FAPEMIG (Minas Gerais Research Foundation, Brazil) to E. Alves (CAG-APQ-01975-5). P.C. Ceresini and E. Alves were supported by research fellowships from Brazilian National Council for Scientific and Technological Development - CNPq (Pq-2 307361/2012-8 and 307295/2015-0). S.I. Moreira was supported by Doctorate research fellowship from CAPES (Higher Education Personnel Improvement Coordination, Brazil). V. L. Castroagudin was supported by Post-Doctorate research fellowships from CNPq (PDJ 150490/2013-5, from 2012–2014), and FAPESP/CAPES (PDJ 2014/25904-2, from 2015–2016). We thank CAPES for sponsoring the establishment of the ‘Centro de Diversidade Genética no Agroecossistema’ (Pro-equipamentos 775202 /2012).en_ZA
dc.description.uriwww.ingentaconnect.com/content/nhn/pimjen_ZA
dc.identifier.citationCastroagudín, VL, Moreira, SI, Pereira, DAS, Moreira, SS, Brunner, PC, Maciel, JLN, Crous, PW, McDonald, BA, Alves, E & Ceresini, PC 2016, 'Pyricularia graminis-tritici, a new pyricularia species causing wheat blast', Persoonia, vol. 37, pp. 199-216.en_ZA
dc.identifier.issn0031-5850
dc.identifier.other10.3767/003158516X692149
dc.identifier.urihttp://hdl.handle.net/2263/58959
dc.language.isoenen_ZA
dc.publisherNaturalis Biodiversity Center and Centraalbureau voor Schimmelculturesen_ZA
dc.rights© 2016 Naturalis Biodiversity Center & Centraalbureau voor Schimmelculturesen_ZA
dc.subjectCryptic speciesen_ZA
dc.subjectHost adaptationen_ZA
dc.subjectPhylogeneticsen_ZA
dc.subjectSystematicsen_ZA
dc.subjectTriticum aestivumen_ZA
dc.titlePyricularia graminis-tritici, a new pyricularia species causing wheat blasten_ZA
dc.typeArticleen_ZA

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