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  • 1 Crop Research Institute Department of Genetics and Plant Breeding Methods CZ-161 06 Praha 6 Ruzyně Czech Republic
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In 2005–2008 virulence of the wheat leaf rust population was studied on Thatcher near-isogenic lines with Lr1, Lr2a, Lr2b, Lr2c, Lr3a, Lr9, Lr10, Lr11, 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 233 wheat leaf rust isolates were analyzed. Resistance gene Lr9 was effective to all tested isolates as in the four previous years. Virulence to Lr19 (0.8% of the analysed isolates) was found. Gene Lr24 conditioned resistance to almost all collections and a lower frequency of virulence was also observed on Lr2a and Lr28 . Twenty-six winter wheat cultivars, seven spring wheat cultivars and seven winter triticale cultivars registered in 2005–2008 were tested with 7 leaf rust isolates. Winter wheat cultivars Biscay, Mulan and Orlando were resistant to all isolates and were also resistant in field trials.

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