Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 10:190-193 (1970)
© 1970 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Comparison of Four Methods of Multiple Trait Selection for Five Traits in Alfalfa1

J. H. Elgin, Jr., R. R. Hill, Jr. and K. E. Zeiders2

Tandem, modified independent culling levels, estimated index, and base index methods of multiple trait selection were compared for improvement of alfalfa, Medicago sativa L., for resistance to Pseudopeziza medicaginis (Lib.) Sacc., Leptosphaerulina briosiana (Poll.) Graham & Luttrell, Ascochyta impertecta Peck, and Uromyces striatus Schroet. vat. medicaginis (Pass.) Arth., and for increasing recovery after cutting in greenhouse and growth chamber facilities. Base index and estimated index methods were most effective, modified independent culling levels was intermediate, and tandem was least effective. Resistance to P. medicaginis and U. striatus, and recovery after cutting responded well to selection; there was little response for resistance to L. briosiana and A. imperfecta.

Key Words: Ascochyta imperfecta Peck • Pzeudopeziza medicaginis(Lib.) Sacc • Leptosphaerulina briosiana (Poll.) Graham & Luttrell • Uromyces Striatus Schroet. var medicaginis (Pass.) Arth • Disease resistance • Recovery after cutting

1 Cooperative investigation between the Pennsylvania Agricultural Experiment Station and the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture. Contribution No. 234 of the U. S. Regional Pasture Research Laboratory and Scientific Article No. 3629 of the Pennsylvania Agricultural Experiment Station, Department of Agronomy. Condensed from a thesis by the senior author submitted to the Graduate School, The Pennsylvania State Univ., in partial fulfillment of the requirements for the Ph.D. degree.

2 Formerly graduate student, now Research Agronomist, Crops Research Division, ARS, USDA, Irrigated Agriculture Research and Extension Center, Prosser, Washington 99350; Research Agronomist, and Plant Pathologist, Crops Research Division, ARS, USDA, U. S. Regional Pasture Research Laboratory, University Park, Pennsylvania 16802, respectively.

Received for publication October 6, 1969.




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