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Propagation of Erysiphe graminis f. sp. tritici on barley and Erysiphe graminis f. sp. hordei on wheat



Propagation of Erysiphe graminis f. sp. tritici on barley and Erysiphe graminis f. sp. hordei on wheat



Phytopathology 55(1): 92-96



When Algerian and Goldfoil barleys, infected with a culture of Erysiphe graminis hordei to which they are susceptible, were inoculated with a culture of the same fungus to which they were normally resistant, infections resulted, and a few conidia of the normally avirulent culture were obtained. When Manchuria barley, infected with E. graminis hordei, was inoculated with E. graminis tritici, a few conidia of E. graminis tritici were produced. When Little Club wheat, infected with E. graminis tritici, was inoculated with E. graminis hordei, a few conidia of E. graminis hordei were produced. No changes in genes conditioning pathogenicity of culture CR3 of E. graminis hordei were detected following the passage of the fungus through wheat. The hypothesis is put forward that infection of either host species with a virulent culture of E. graminis alters the physiological environment within that host plant, rendering it susceptible to subsequent infection by cultures of the fungus to which it is normally resistant.

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