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Development of Maize Hybrids through Selection among Full-Sib Families¹

A total of 102 full-sib families (cryptic double crosses) were made up between two maize populations which had undergone several cycles of recurrent selection for general combining ability. The families exhibited an average heterosis of 31% and averaged 6% higher yields than three elite double-cross hybrid checks with which they were compared over a 2-year period. The prolific parent plants used in making the full-sib families were self-pollinated at the time crosses were made. A second round of full-sib families using the F₂ progenies from parents of selected crosses gave evidence of further yield improvement. The procedure can be used to develop sister-line or modified hybrids with relative ease.

² C. Petrus Peterson Professor of Agronomy and Instructor, Department of Agronomy, University of Nebraska, Lincoln.

Received for publication January 30, 1967.