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In 2012-2015 the virulence of the wheat leaf rust (Puccinia triticina Eriks.) population was studied on Thatcher near-isogenic lines with Lr1, Lr2a, Lr2b, Lr2c, Lr3a, Lr9, Lr10, Lr11, Lr13, Lr15, Lr17, Lr19, Lr21, Lr23, Lr24, Lr26 and Lr28. Samples of leaf rust were obtained from different parts of the Czech Republic. A total of 163 wheat leaf rust isolates were analysed. No virulence for the resistance gene Lr9 was found. Virulence for Lr19 was found only in one isolate in 2015. A lower frequency of virulence to Lr24, Lr2a, 2b, 2c and Lr28 was also observed. The presence of Lr10, Lr24, Lr26, Lr28 and Lr37 in registered cultivars was detected by polymerase chain reaction (PCR) molecular markers.
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Hanzalová et al. (2017) studied this question.
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