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Resistance of Cf-ECP2 lines is solely dependent on the production of the ECP2 protein by C. fulvum during infection. Plants of line 1 were inoculated with the wild-type ECP2-producing strain (race 5) (Left), the isogenic Ecp2-lacking strain (Center), and the ECP2-overproducing strain (Right). Note that only the plants inoculated with the Ecp2-lacking strain showed symptoms of chlorosis on the upper side of the leaf 20 days after inoculation.
