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Tetrasomic Inheritance of Resistance in Alfalfa to the Pea Aphid¹

The inheritance of resistance in Medicago sativa L. to the pea aphid, Macrosiphum pisi (Kalt.), was studied a resistant selection 81-1 and two susceptible selections. An antibiosis test for testing alfalfa plants for resistance to the pea aphid was developed using a controlled environment and a uniform stage of physiological growth. A quantitative score of the surviving aphids per adult day was a reliable index of plant resistance when considered in reference to a susceptible check variety or done. Progenies of the resistant selection 81-1 were classified either resistant or susceptible on the basis of surviving aphids per adult day. The results obtained from the S₁ and S₂ segregating progenies indicated that one dominant factor conferred resistance to the pea aphid. The S₂ progeny reactions were in accordance with a tetrasomic interpretation. A hypothesis was presented concerning the behavior of the testcross progeny of S₁ plants which permits agreement with this interpretation.

² Associate Professor of Agronomy, Purdue University, and professor of Agronomy, University of California, Davis respectively.

Received for publication October 15, 1965.