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Powdery mildew infection (isolate CH4.8) on the second leaf of seedling from two BC2F6 ILs from population “4176,” 7 days after inoculation. 4176/16_97 is homozygous at the resistance locus whereas 4176/16_51 is heterozygous. Their resistance phenotype is identical and present necrotic lesions characteristic of HR.
