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Inheritance of Reaction to the Reniform Nematode in Soybean¹

Inheritance of reaction to reniform nematode (Rotylenchulus reniformis Linford and Oliveira), a pest of soybean [Glycine max (L.) Merr.] in many areas of the southeastern U.S.A., was studied in the cross ‘Forrest’(resistant) x ‘Ransom’ (susceptible). Parental, F₁,F₂, and F₃, populations were screened in soil infested with 2,000 to 4,200 reniform nematode larvae per 500cc of soil. Segregation ratios indicated that reniform nematode resistance was recessive and controlled by alleles at one locus. Intermediate infection classes in the F₂ not shared by F₁ and parental types probably resulted from environmental effects or one or more minor genes. The symbols R_rn and _rfn are proposed for the major gene pair.

Key Words: Rotylenchulus reniformis (Linford and Oliveira) • Nematode resistance • Glycine max (L.) Merr

² Former associate professor, (presently plant breeder, Jacob Hartz Seed Co., P.O. Box 946, Stuttgart, AR 72160), associate professor, former research associate (presently field representative, American Rice Growers Exchange, Lake Charles, La.), Dep. of Agronomy, Louisiana Agric. Exp. Stn., and research plant pathologist - USDA-SEA-AR, Baton Rouge, LA 70803. respectively.

Received for publication May 2, 1980.

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