OAR@ICRISATVariation in expression of monogenic resistance in corn to Exserohilum turcicum race 3 under different temperature and light regimesSLeathauthorR PThakurauthorK JLeonardauthorExpression of monogenic resistance in near-isogenic maize inbred lines H4460Ht1, H4460Ht2 and H4460Ht3 against isolates of races 1 and 3 of Exserohilum turcicum (Setosphaeria turcica) was determined under different temp. and light intensity regimes. These environmental conditions influenced lesion type, number, length and sporulation of the fungus. In general, isolates produced more lesions at 22/18 than at 26/22°C and more lesions at 162 or 324 than at 647 µmol m-2 s-1 at 22/18°. Lesions were also larger (P=0.05) at the reduced light intensities. Virulence of 3 races of S. turcica was clearly expressed and consistent with earlier reports at 22/18° day/night temp. and low light intensity (324 or 162 µmol m-2 s-1), but inconsistencies arose at 26/22° day/night temp. and 647 µmol m-2 s-1 light intensity. Resistance of Ht1, Ht2 and Ht3 was often incomplete at 22/18° day/night temp. and low light intensity. Race 3 could be readily recognized at a 22/18° day/night temp. regime with the differential reaction clearest at a light intensity of 324 µmol m-2 s-1Others1990American Phytopathological SocietyArticle

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