Powdery mildew resistance of foreign spring barley varieties in Czech Official Trials
Dreiseitl, A.(Agrotest fyto, Kromeriz (Czech Republic)) E-mail:[email protected]
Resistance to powdery mildew was studied in 168 foreign varieties of spring barley included in Czech Official Trials in 1993-2005. Sixteen known resistances to powdery mildew were identified as follows: Ab, Al, Ar, HH, Kw, La, Ly, MC, Mlo, N81, Ri, Ru, Sp, St, Tu, and We. Unknown resistances were found in 32 varieties. They were effective against all used pathotypes of the pathogen in 9 out of these 32 varieties. Seven varieties exhibited heterogeneity in the examined trait, i.e. they were composed of lines (usually two) with different resistances to powdery mildew. The resistance Mlo, which was found in 75 homogeneous varieties, dominated in the set. The resistances Ru, We, Ar and La were also frequently present. The examined set included 53% of varieties resistant to all indigenous pathotypes studied.
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