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Variance Components and Linkage Effects for Quantitatively Inherited Traits in Two Barley Crosses 1
Author(s) -
VandeLogt M. B.,
Brinkman M. A.,
Forsberg R. A.
Publication year - 1984
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/cropsci1984.0011183x002400020027x
Subject(s) - biology , hordeum vulgare , test weight , grain yield , heritability , overdominance , dominance (genetics) , variance components , linkage (software) , agronomy , genetics , heterosis , mathematics , statistics , poaceae , hybrid , gene
The objective of this study was to evaluate components of genotypic variance and the effects of linkage for heading date, plant height, kernel brightness, test weight and grain yield in two barley ( Hordeum vulgare L.) crosses, Bonanza/H279‐70‐1‐4 and Larker/H279‐70‐1‐4. In 1977, F 4 , F 5 , F 6 , and F 7 generations of 49 families from each cross were grown in a split plot design with families as whole plots and generation lines as subplots. The experimental procedure was repeated in 1978 with the F 5 , F 6 , F 7 , and F 8 generations. A hierarchal structure of the experimental material was used so that genotypic variances and covariances could be calculated. Least squares procedures were used to evaluate additive, dominance, and linkage effects. Additive genetic variance was an important component of the observed variances and covariances for all traits in both crosses. Dominance variance was present for heading date, kernel brightness, test weight, and grain yield, but dominance mean squares may have been inflated by linkage effects. There was couplingphase linkage for grain yield in both crosses and for heading date in Larker/H279‐70‐1‐4. The results indicated that breeding procedures which keep linked blocks of favorable genes intact should be utilized in crosses among adapted barley genotypes.