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|a 10.1094/PDIS-09-18-1638-SR
|2 doi
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|a eng
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|a Kolmer, J A
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|a Virulence of Puccinia triticina, the Wheat Leaf Rust Fungus, in the United States in 2017
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|c 2019
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|a Text
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|a ƒaComputermedien
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|a Date Completed 09.08.2019
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|a Date Revised 09.08.2019
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Samples of wheat leaves infected with the leaf rust fungus, Puccinia triticina, were obtained in 2017 from agricultural experiment station plots, demonstration plots, and farm fields in the Great Plains, the Ohio Valley, the southeastern states, California, and Washington in order to determine the prevalent virulence phenotypes present in the United States. A total of 65 virulence phenotypes were identified among the 469 single uredinial isolates that were tested on 20 near-isogenic lines of Thatcher wheat that differ for leaf rust resistance genes. Virulence phenotypes MBTNB at 11.3% of the overall population, and MCTNB at 7.0%, were the first and third most common phenotypes. Both phenotypes were found mostly in the southeastern states and Ohio Valley region. Phenotype TFTSB at 10.9% was the second most common phenotype and was found mostly in southern Texas. Virulence to leaf rust resistance gene Lr39, which is present in hard red winter wheat cultivars, was highest in the Great Plains region. Virulence to Lr11 and Lr18, which are present in soft red winter wheat cultivars, was highest in the southeastern states and Ohio Valley region. Virulence to Lr21, which is present in hard red spring wheat cultivars, was highest in the northern Great Plains region. The predominate P. triticina phenotypes from the soft red winter wheat regions of the southeastern states and Ohio Valley area differed from those in the hard red winter and hard red spring wheat areas of the Great Plains region. Collections from Washington had unique virulence phenotypes that had not been previously detected
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|a Journal Article
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|a fungi
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|a pathogen diversity
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| 650 |
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|a wheat
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|u http://dx.doi.org/10.1094/PDIS-09-18-1638-SR
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