Virulence frequencies to powdery mildew resistance genes of winter barley cultivars
Dreiseitl, A.(Agrotest, Zemedelske Zkusebnictvi, Poradenstvi a Vyzkum, Kromeriz (Czech Republic))E-mail:[email protected]
The winter barley cultivars registered and newly tested in the Czech Republic were studied in 2000, 2002 and 2004 for powdery mildew resistance. Random samples of the populations originating from winter and spring barley fields were obtained from the air by a mobile version of a jet spore sampler mounted on a car roof. Conidia were sampled by driving across the Czech Republic. Fourteen differentials, carrying 18 out of 20 currently identified resistance genes present in winter barley cultivars, were used. High virulence frequencies (85-100%) to most resistance genes were found. Lower virulence frequencies (14.1-40.1%) were found to only three resistance genes that have not been described yet; their preliminary designations are Ml(Va), Ml(Dt) and Ml(Ca).
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