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Comparison of S 1 and Testcross Evaluation after Two Cycles of Recurrent Selection in Maize 1
Author(s) -
Genter C. F.
Publication year - 1973
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1973.0011183x001300050009x
Subject(s) - selection (genetic algorithm) , population , biology , yield (engineering) , diallel cross , agronomy , materials science , hybrid , computer science , artificial intelligence , demography , sociology , metallurgy
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 S 1 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. S 1 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 S 1 selection increased both combining ability and population yield. The yield of the second‐cycle S 1 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 S 1 selection produced significantly higher yields when intercrossed or crossed with VCBS than either population derived by testcross selection. S 1 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.