Rapid changes in the genetic composition of Stagonosporopsis tanaceti population in Australian pyrethrum fields
Article
Article Title | Rapid changes in the genetic composition of Stagonosporopsis tanaceti population in Australian pyrethrum fields |
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ERA Journal ID | 2639 |
Article Category | Article |
Authors | Vaghefi, Niloofar (Author), Hay, Frank S. (Author), Ades, Peter K. (Author), Pethybridge, Sarah Jane (Author), Ford, Rebecca (Author) and Taylor, Paul W. J. (Author) |
Journal Title | Phytopathology: International Journal of the American Phytopathological Society |
Journal Citation | 105 (3), pp. 358-369 |
Number of Pages | 12 |
Year | 2015 |
Publisher | American Phytopathological Society |
Place of Publication | United States |
ISSN | 0031-949X |
1943-7684 | |
Digital Object Identifier (DOI) | https://doi.org/10.1094/PHYTO-08-14-0212-R |
Abstract | A 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. |
ANZSRC Field of Research 2020 | 310805. Plant pathology |
310599. Genetics not elsewhere classified | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Melbourne |
University of Tasmania | |
Cornell University, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4610/rapid-changes-in-the-genetic-composition-of-stagonosporopsis-tanaceti-population-in-australian-pyrethrum-fields
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