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Published in Crop Sci 11:88-91 (1971)
© 1971 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Comparison of Expected Genetic Advance with Selection on the Basis of Clone and Polycross Progeny-Test Performance in Alfalfa1

R. R. Hill, Jr.2, M. W. Pedersen2, L. J. Elling3, R. W. Cleveland4, J. H. Graham5, F. I. Frosheiser6 and J. L. Starling4

Sixty-seven alfalfa, Medicago sativa L., clones and their polycross progenies were evaluated for hay, seed, and chaff yields. The progenies were also evaluated in separate experiments for resistance to Corynebacterium insidiosum (McCull.) Jens.; Leptosphaerulina briosiana (Poll.) Graham & Luttrell; Pseudopeziza medicaginis (Lib.) Sacc.; Phoma herbarum West. f. medicaginis West, ex. Rab.; and Uromyces striatus Schroet. var. medicaginis (Pass.) Arth. Expected genetic gains with selection on the basis of clone and polycross progeny-test performance were compared for each of the characters. Relative effectiveness of the two methods varied with heritability of the trait and the selection intensity permitted with each method; the polycross progeny test was favored with traits which had low heritability. Expected advance from selection on the basis of polycross progeny-test performance was greater for hay, seed, and chaff yields, but expected advance with individual plant selection was greater for resistance to some of the pathogens.

Key Words: Medicago sativa L. • Disease resistance • Heritability

1 Contribution No. 227 of the U.S. Regional Pasture Research Laboratory, Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, University Park, Pa. 16802. Authorized for publication as Journal Series No. 3481 by the Pennsylvania Agricultural Experiment Station, University Park, Pa.; Journal Series No. 6681 of the Minnesota Agricultural Experiment Station, St. Paul, Minn. 55101; and Journal Series No. 844 of the Utah Agricultural Experiment Station, Logan, Utah 84321.

2 Research Agronomists. Crops research Division, ARS, USDA, University Park, Pa., and Logan, Utah, respectively.

3 Professor of Agronomy, University of Minnesota, St. Paul.

4 Associate Professors of Agronomy, The Pennsylvania State University, University Park.

5 Assistant Chief, Vegetables and Ornamentals Research Branch, Crops Research Division, ARS USDA, Beltsville, Md. 20705 (formerly Research Plant Pathologist, University Park, Pa.).

6 Research Plant Pathologist, Crops Research Division, ARS, USDA, St. Paul, Minn.

Received for publication July 8, 1970.




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