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Evaluation of the Effectiveness of Polycross- and Self-Progeny Tests in Increasing the Yield of Alfalfa Synthetic Varieties¹

Selection for forage yield based on polycross- and selfprogeny performance was practiced on two broadbased alfalfa (Medicago sativa L.) populations by selecting the best 10% as parents for experimental synthetic varieties. Random samples of 60 plants from populations A and B were assessed for breeding value to compare the efficiencies of the polycross- and the self-progeny test methods. The best six plants from each population and from each test method were selected as parents for synthetic varieties. The Syn 2 generations of several experimental synthetics were evaluated near Raleigh, N. C.; Reno, Nevada; and Prosser, Washington. Selection based on both methods of progeny testing was ineffective in increasing yield. The study indicated the importance of genotype x environment interactions on selection experiments.

Key Words: Medicago sativa L. • Gene action • Selection procedures • Genotype x environment interaction

² Research Geneticist, ARS, USDA, Raleigh, NC 27607

³ Research Agronomist, ARS, USDA, Reno, Nevada.

⁴ Research Agronomist, ARS, USDA, Prosser, Washington.

Received for publication February 5, 1973.