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Six unselected lines from the variety Midland (Zea mays) were compared in single- and three-way crosses to provide estimates of the influence of epistasis on grain yield. Significant estimates of epistasis were obtained involving five of the six lines. In spite of the significance of the estimates, epistatic effects are not considered to be of major importance.
2 Research Agronomist, ARS, USDA, and Professor of Agronomy, The Pennsylvania State University.
Received for publication January 18, 1967.
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