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A Second Gene for Resistance to Peanut Mottle Virus in Soybeans¹

Peanut mottle virus (PMV) occurs naturally in peanuts (Arachis hypogaea L.), soybeans [Glycine max (L.) Merrill], and a few leguminous weed species. This disease is widespread on soybeans in areas of the southeastern U. S. where both peanuts and soybeans are grown. In an effort to identify additional genes for resistance to PMV in soybeans, the allelic relationships between genes for resistance from various germplasm sources were studied. Crosses were made between resistant and susceptible lines and among resistant lines. The F₁, F₂, and F₃, generation seedlings derived from selected crosses were tested in the greenhouse for reaction to a PMV isolate (PMV-S/V74S). It was shown that resistance in the cultivar ‘Peking’ is conditioned by a single recessive gene, designated rpv₂, that has not been previously reported.

Key Words: Glycine max (L.) Merrill • Disease resistance

² Former graduate assistant (now assistant professor, Texas Agric. Exp. Stn., Overton, TX 75684); assistant professor of agronomy and associate professor of plant pathology and physiology, respectively, Virginia Polytechnic Inst. and State Univ., Blacksburg.

Received for publication January 5, 1979.