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Comparison of Combined Half-sib and S₁ Family Selection with Half-sib, S₁, and Selection Index Procedures in Maize

A combined half-sib (HS) and S_l family evaluation procedure (HS-S₁) in a maize (Zea mays L.) population was compared with HS and S₁ per se evaluation and with a selection index of the form I = b₁X_l + b₂X₂ where X₁ and X₂ are grain yields of the HS and S₁ families, respectively. The combined HS-S₁ evaluation resulted in lower selection differentials than either HS or S₁ evaluation. Combined HS-S₁ selection in the CO (original population) identified 81, 71, and 77% of the selected families in common with HS, S₁ and a selection index, respectively, and 60, 58, and 85% in CI. HS-S₁ resulted in selection of genotypes better buffered to environmental differences than either HS or $1 alone. The evidence indicates that HS evaluation results in selection of genotypes with above average population heterotic response and greater than average inbreeding depression while S₁ evaluation has the opposite effect. Selection on combined HS-S₁ evaluation resulted in genotypes with less than average inbreeding depression and average or better heterotic response. The selection index has a similar effect. Expected gains showed combined HS-S₁ with resynthesis using S₁ progenies to be equal to or greater than other procedures.

Key Words: Recurrent selection • Maize breeding

² Breeder, Hellenic Sugar Industry, Research Division, 34 Metropoles St., Thessaloniki, Greece (formerly research assistant) and professor of agronomy. Univ. of Wisconsin, Madison, WI 53706.

Received for publication February 6, 1976.