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Genetic Resistance to Reniform Nematodes in Soybeans. B. G. Harville, Associate Professor, Department of Agronomy, Louisiana Agricultural Experiment Station, Louisiana State University, Baton Rouge 70803. A. Green, Research Associate, Department of Agronomy, Louisiana Agricultural Experiment Station; and W. Birchfield, Research Plant Pathologist, U.S. Department of Agriculture, ARS, Louisiana State University, Baton Rouge 70803. Plant Dis. 69:587-589. Accepted for publication 14 January 1985. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-587.

A study was conducted to determine the number of genes by which four soybean (Glycine max) cultivars differ for resistance to the reniform nematode Rotylenchulus reniformis. The cultivars Davis, Bragg, Dare, and Pickett 71 are classified as susceptible, moderately susceptible, moderately resistant, and resistant, respectively. Four F1 soybean populations had mean egg mass ratings that did not differ from those of their respective susceptible parents. Resistance to the reniform nematode in soybeans is concluded to be quantitative in nature and controlled by two pairs of genes with unequal effects. The proposed genotypes of the four parental cultivars were Davis Rn1 Rn1 Rn2 Rn2, Bragg Rn1 Rn1 rn2 rn2, Dare rn1 rn1 Rn2 Rn2, and Pickett 71 rn1 rn1 rn2 rn2.