Inheritance of Resistance to Heterodera glycines Race 3 in Soybean Accessions. A. P. RAO-ARELLI, Research Associate Professor, Department of Agronomy, University of Missouri, Columbia 65211. A. P. RAO-ARELLI, Research Associate Professor, Department of Agronomy, University of Missouri, Columbia 65211. Plant Dis. 78:898-900. Accepted for publication 15 June 1994. Copyright 1994 The American Phytopathological Society 898. DOI: 10.1094/PD-78-0898.

Soybean cyst nematode (Heterodera glycines) is a major pest of soybean (Glycine max). Crop losses are primarily reduced by the use of host plant resistance. Soybean accessions PI 89772, PI 209332, PI 438489B, and PI 404166 were crossed with susceptible cv. Essex to determine inheritance of resistance to H. glycines race 3. The F1, F2, and F3 plants from each cross were bioassayed in the greenhouse. The reactions of the parental lines and progenies to infection by H. glycines support the hypothesis that resistance in PI 89772 and PI 209332 is conditioned by one dominant and one recessive gene. Resistance in PI 438489B is conferred by two recessive genes. Two dominant genes and one recessive gene condition resistance in accession PI 404166. Knowledge of the inheritance of resistance to H. glycines race 3 in these accessions should enhance their usefulness in breeding programs.