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Genetic Variances in a Synthetic Variety of Maize Estimated by Two Mating Designs 1
Author(s) -
Sentz J. C.
Publication year - 1971
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/cropsci1971.0011183x001100020020x
Subject(s) - biology , tassel , mating design , epistasis , additive genetic effects , genetic variation , population , selection (genetic algorithm) , genetic variability , agronomy , interaction , heritability , statistics , microbiology and biotechnology , genotype , zea mays , heterosis , genetics , mathematics , hybrid , gene , demography , artificial intelligence , sociology , computer science
Genetic parameters for a synthetic variety of maize ( Zea mays L.) were estimated from Design I (D‐I) Design II (D‐11) matings. Corn borer and stalk rot resistance selection in derivation of lines had no effect upon mean yield or other traits in the D‐II reconstituted population. Additive variance was significant with both designs and of primary importance for all traits. Dominance variance contributed 45% of the genetic variance for yield, but was relatively unimportant for other traits. Greater additive variance estimates with D‐II indicate some epistasis may exist for height and days to tassel. However, additive estimates were less with D‐II for yield, ear moisture, and ear diameter. Genotype‐environment interactions were important for yield and ear moisture, but no consistent rdationships with their respective genetic components were obtained. In the absence of first‐order genotype interactions with years and locations, I pooled the interaction mean squares for D‐I analysis. D‐I was less sensitive than D‐II for estimating genetic variances, particularly dominance variance. Although variance estimates were not large, expected yield increase with half‐sib progeny selection was 6.1 to 8.6%.