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Variance Components and Linkage Effects for Quantitatively Inherited Traits in Two Barley Crosses¹

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, F₄, F₅, F₆, and F₇ 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 F₅, F₆, F₇, and F₈ 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.

Key Words: Genotypic variance • Genotypic covariance • Additive genetic effects • Dominance effects • Hierarchal structure • Heading date • Plant height • Kernel brightness • Test weight • Grain yield

² Former graduate student (presently district sales representative, Super Crost Seed Co., Green Bay, WI 54303), associate professor, and professor, Dep. of Agronomy, Univ. of Wisconsin-Madison, WI 53706.

Received for publication May 4, 1983.

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