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Publication Type
Conference Proceedings
Author, Analytic
Ross-Davis, A.; Graça, R; Alfenas, A.; Peever, T.; Hanna, J.; Uchida, J.; Hauff, R.; Kadooka, C.; Kim, M.; Cannon, P.; Namba, S.; Minato, N.; Simento,S.; Perez, C.; Rayamajhi, M.; Morán, M.; Lodge, D.; Arguedas, M.; Medel-Ortiz, R.; López-Ramirez, M.; Tennant, P.; Glen, M.; Klopfenstein, N.
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Paper/Section Title
Tracking the distribution of the pandemic Puccinia psidii genotypes
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Proceedings Title
Annual meeting of the American Phytopathological Association
Date of Meeting
August 10-12
Place of Meeting
Austin, Texas
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Date of Publication
2013
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Abstract
Puccinia psidii is a rust pathogen hypothesized to be of neotropical origin with a wide host range within the family Myrtaceae. Microsatellite markers were used to infer genetic relationships among pathogen samples from South America (Brazil, Paraguay, and Uruguay), Central America (Costa Rica), Mexico, the Caribbean (Puerto Rico), USA (California, Florida, and Hawaii), Australia, and Japan. Allelic patterns revealed several multilocus genotypes (MGs) among these isolates. Isolates sampled from different host species in South America had distinct, host-associated MGs. Conversely, isolates sampled from similarly diverse hosts in Costa Rica, Mexico, Puerto Rico, USA (California, Florida, and Hawaii), Australia, and Japan had closely related MGs that differed markedly from the South American MGs. These results indicate that a single set of closely related, recently introduced MGs is causing widespread disease of several myrtaceous species outside South America. Further, our data appear to exclude eastern South America as the source of these pandemic MGs. Concurrently, bioclimatic modeling is being used to predict global areas at risk from these MGs and identify putative source populations of the pathogen.....
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