Wheat yellow rust in Poland: virulence frequencies in pathogen population
Anna Woźniak-Strzębicka
a.strzebicka@ihar.edu.plZakład Oceny Jakości i Metod Hodowli Zbóż, Instytut Hodowli i Aklimatyzacji Roślin w Krakowie (Poland)
Abstract
Yellow rust, caused by Puccinia striiformis f. sp. tritici, is becoming more and more a serious threat to wheat cultivation in Poland. Pathogenicity of the pathogen population was investigated in 1999–2001. Variation in virulence was estimated for 225 isolates of Puccinia striiformis f. sp. tritici collected mainly in north-western regions of the country. These isolates were tested for virulence on seedlings of the World / European differential set with Yr the resistance genes. Virulence frequency for the resistance genes Yr1, Yr2, Yr3, Yr4, YrSD, YrCV, Yr2+Yr6, Yr3a+Yr4a was very high (90–100%). Virulence to the Yr10, YrSu, YrA+Yr6 was generally low. Frequency of virulence for the Yr9 slowly increased from year to year. No virulence was found to resistance genes Yr7, Yr17, YrA, Yr6+Yr7. Seven pathotypes were identified in the yellow rust population. The differential cultivars were tested also in the field under artificial inoculation with mixture of isolates of the pathogen. In adult stage the genes Yr7, Yr17, YrA, Yr6+Yr7, YrA+Yr6 provided full protection against population of Puccinia striiformis f. sp. tritici.
Keywords:
Puccinia striiformis f. sp. tritici, resistance genes, virulenceReferences
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Authors
Anna Woźniak-Strzębickaa.strzebicka@ihar.edu.pl
Zakład Oceny Jakości i Metod Hodowli Zbóż, Instytut Hodowli i Aklimatyzacji Roślin w Krakowie Poland
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