Selection in Zea Mays L. by Inbred Line Appearance and Testcross Performance in Low and High Plant Densities, June 1967

(1967) Selection in Zea Mays L. by Inbred Line Appearance and Testcross Performance in Low and High Plant Densities, June 1967. Iowa State University

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Abstract

The purposes of this study were: 1. to test the hypothesis that lines selected by performance in high population densities will be superior at both low and high population densities, but that lines selected in low-population densities may not be superior in high-population densities; 2. to compare the effectiveness of visual selection and selection by testcross performance for the production of lines superior as inbreds and in hybrid combination; and 3. to observe the pattern of ear-shoot elongation of the selected lines during the two weeks before silking and to relate these patterns to selection methods and combining abilities.