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Inheritance of Stem-Nematode Resistance in Alfalfa¹

Inheritance of resistance to stem nematode [Ditylenchus dipsaci (Kühn) Filipjev] in alfalfa (Medicago sativa L.) was investigated by selfing and testcrossing 25 resistant and three susceptible clones. Progeny were inoculated with stem nematodes and resistant:susceptible segregation ratios were determined. Segregation ratios could be explained under the hypothesis that resistance was conditioned by two complementary, dominant, tetrasomically inherited genes, Sn and Sn₁. In addition, segregations from earlier reports proposing possible disomic multiple-gene inheritance schemes were reevaluated and were found to fit tetrasomic inheritance schemes.

Key Words: Ditylenchus dipsaci (Kühn) Filipjev • Medicago sativa L. • Genetics

² Research agronomist, Field Crops Lab., Plant Genetics & Germplasm Inst., AR, SEA, USDA, BARC-West, Beltsville, MD 20705 (formerly, Irrigated Agric. Res. and Ext. Ctr., Prosser, Wash.)

Received for publication October 20, 1978.