ROLE OF CHROMOSOME 5B IN CONTROLLING BLACK POINT INCIDENCE IN HARD RED SPRING WHEAT

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Abstract
Tests of several wheat (Triticum aestivum) cultivars against Cochliobolus sativus, a causal agent of black point, showed that black point incidence was lowest in Cadet, intermediate to high in Apex, and highest in S-615 and Rescue. Inoculation of disomic substitution lines for chromosome 5B demonstrated that black point incidence in Cadet is controlled by a gene or genes located on chromosome 5B. The F1 progeny from crosses between Cadet and Rescue had a black point incidence similar to that of Rescue, indicating that resistance is a recessive trait. Resistance to black point and common root rot was not related since the moderately root rot resistant cultivar Apex did not consistently have a lower incidence of black point than the root-rot-susceptible cultivars Rescue and S-615. A test of these cultivars against black point caused by Alternaria alternata found that all cultivars were as susceptible as the soft white spring wheat cultivar Fielder.Key words: Wheat, Cochliobolus sativus, black point, chromosome 5B