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dc.contributor.authorVaghefi, Niloofar
dc.contributor.authorHay, Frank S
dc.contributor.authorAdes, Peter K
dc.contributor.authorPethybridge, Sarah J
dc.contributor.authorFord, Rebecca
dc.contributor.authorTaylor, Paul WJ
dc.date.accessioned2019-03-21T00:46:37Z
dc.date.available2019-03-21T00:46:37Z
dc.date.issued2015
dc.identifier.issn0031-949X
dc.identifier.doi10.1094/ PHYTO-08-14-0212-R
dc.identifier.urihttp://hdl.handle.net/10072/167395
dc.description.abstractA novel set of microsatellite markers were developed and employed for geographical and temporal population analyses of Stagonosporopsis tanaceti, the cause of ray blight of pyrethrum in Australia. Genotyping of 407 isolates, using 13 markers, suggested an asexual mode of reproduction with significant linkage disequilibrium and high levels of clonality. Low geographical differentiation and widespread distribution of a few multilocus genotypes (MLGs), in the absence of airborne ascospores, suggested the role of human-mediated movement of seed as a major means of long-distance pathogen dispersal. The genetic composition of S. tanaceti was stable for a decade then changed rapidly in only 2 years. Bayesian clustering analyses and minimum spanning networks determined only two major clonal lineages in and prior to 2010. However, in 2012, a previously unobserved cluster of MLGs was detected, which significantly increased in frequency and displaced the historically dominant MLGs by 2013. This rapid change in the genetic composition of S. tanaceti could indicate a second introduction then a selective sweep, or strong selection pressures from recently introduced fungicides or pyrethrum varieties. These results may have serious implications for durability of management strategies for this disease.
dc.description.peerreviewedYes
dc.languageEnglish
dc.publisherAmerican Phytopathological Society
dc.publisher.placeUnited States
dc.relation.ispartofpagefrom358
dc.relation.ispartofpageto369
dc.relation.ispartofissue3
dc.relation.ispartofjournalPhytopathology
dc.relation.ispartofvolume105
dc.subject.fieldofresearchPopulation, Ecological and Evolutionary Genetics
dc.subject.fieldofresearchMicrobiology
dc.subject.fieldofresearchPlant Biology
dc.subject.fieldofresearchCrop and Pasture Production
dc.subject.fieldofresearchcode060411
dc.subject.fieldofresearchcode0605
dc.subject.fieldofresearchcode0607
dc.subject.fieldofresearchcode0703
dc.titleRapid changes in the genetic composition of Stagonosporopsis tanaceti population in Australian pyrethrum fields
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
dc.description.versionPublished
gro.rights.copyright© 2015 The American Phytopathological Society. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.100115
gro.hasfulltextFull Text
gro.griffith.authorFord, Rebecca


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