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  1. Vol. 13 No. 5, p. 524-527
     
    Received: Feb 17, 1973
    Published: Sept, 1973


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doi:10.2135/cropsci1973.0011183X001300050009x

Comparison of S1 and Testcross Evaluation after Two Cycles of Recurrent Selection in Maize1

  1. C. F. Genter2

Abstract

Abstract

Two populations of maize (Zea mays L.), Virginia Corn Belt-Southern Synthetic (VCBS) which was developed from a broad genetic base, and Virginia Long Ear Synthetic (VLE) which was developed from intercrosses of seven Corn Belt inbred lines, were advanced two cycles of recurrent selection based on S1 and testcross progeny yield. The 10 populations and their diallel crosses were grown at 3 locations with 6 replications at each location. Significant improvement in population yield and combining ability was achieved only with VCBS.

S1 selection in VCBS was more effective than testcross selection in increasing both population yield and combining ability. Testcross selection was effective in increasing the frequency of genes that contribute to yield in crosses but not in populations per se whereas S1 selection increased both combining ability and population yield. The yield of the second-cycle S1 selection population yielded 9.0 q/ha (11%) more than the second-cycle testcross population and its mean population cross yield was 1.5 q/ha higher. The two populations derived from VCBS by S1 selection produced significantly higher yields when intercrossed or crossed with VCBS than either population derived by testcross selection. S1 selection in VCBS was as effective as testcross selection in increasing the frequencies of genes that contribute to yield, whether in inbred (derived) or hybrid populations.

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