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Resistance

Two Genes for Resistance to Race 5 of Cercospora sojina in Soybeans. D. V. Phillips, Department of Plant Pathology, Georgia Experiment Station, Experiment 30212; H. R. Boerma, Department of Agronomy, University of Georgia, Athens 30602. Phytopathology 72:764-766. Accepted for publication 12 October 1981. Copyright 1982 The American Phytopathological Society. DOI: 10.1094/Phyto-72-764.

Crosses were made between the cultivars Lincoln and Davis, which are resistant to race 5 of Cercospora sojina, and the susceptible cultivars, Blackhawk and Hood. Evidence from greenhouse inoculations of progeny from F₁, F₂, and F₃ generations indicated that resistance in Lincoln was conditioned by a single dominant gene and that resistance in Davis was conditioned by another dominant gene at a different locus. No cytoplasmic or maternal effect on the expression of resistance was detected. The resistant reaction in Davis was often characterized by small lesions or flecks developing on inoculated leaves, whereas, there seldom were any lesions on Lincoln plants inoculated with race 5.