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Convergent-Divergent Selection for Area Improvement in Maize¹

The development of basic breeding populations that are adapted to a wide area and have at least some resistance to crop hazards in a region is important to breeders. A program designed to develop such a population of maize (Zea mays L.) for the northern Cornbelt is described. Six breeders in the area contributed germplasm samples (convergence) which were intercrossed. Samples of the resulting population were sent to each collaborator (divergence) who practiced mass selection for healthy, productive plants. In subsequent years, harvested samples (balanced composites) sent to Wisconsin (the convergent phase) were subdivided and redistributed (divergence) in such a way that seed for each location did not include seed harvested from that location the previous year.

Key Words: Population improvement • Mass selection • Cooperative breeding • Stabilizing selection • Zea mays L.

² Department of Agronomy, Univ. of Wisconsin, Madison; Dep. of Agronomy, Univ. of Nebraska, Lincoln; Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul; formerly of Northrup King and Co., Stanton, Minn., currently NAPB, Brookston, Ind.; Dep. of Plant Sciences, South Dakota State Univ., Brookings; formerly of Pioneer Hi Bred International, Mankato, Minn., currently Pfizer Genetics, St. Louis, Mo.

Received for publication October 9, 1978.

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