Abstract
A total of 50 common wheat Cultivars and advanced breeding lines grown in Western Siberia were tested with a set of eleven differential powdery mildew isolates. Thirteen cultivars were susceptible and seven Cultivars showed susceptible and intermediate responses. Eight cultivars revealed the response pattern of individual resistance genes Pm2, Pm4b, Pm6, Pm8, and Mlar, respectively. Eleven cultivars exhibited the response pattern documented for two resistance genes in combination. Seven cultivars expressed the response pattern of Pm6 in combination with either Pm2, Pm4b, or Pm8, another three cultivars the combination of Pm4b with either Mlar or Pm1. In addition, two cultivars responded to the pattern of gene Pm8 in combination with either gene pm5 or Pm6. One cultivar exhibited the combination of three genes Pm1 + Pm2 + Pm6, and two cultivars Pm1 + pm5 + Pm8. Eight cultivars revealed isolate-specific response patterns that could not be attributed to resistance genes or gene combinations present in the differential cultivars/lines.
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