Estimates of Genetic and Environmental Variability in Barley1

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Abstract
Two populations of F3 derived lines of barley were studied in the F5, F6, and F7 generations. Variance components and heritability were estimated and genetic advance predicted for each of seven traits. The genotype ✕ environment interaction components of variance were smaller than the genotype and plot error components for all traits, except percent nitrogen in one population. Estimates of the second order interaction, σ2gly, were generally larger than those of the first order interactions, σ2gl, and σ3gy Heritability estimates were highest for heading date and diastatic power, intermediate for kernel plumpness, height, and extract, and lowest for yield, for percent nitrogen, heritability was relatively high in population 1 and low in population 2.Under the conditions of this study, a single trial with 3 replicates gave sufficient information for each of the seven traits to provide favorable odds of including the elite lines if the top 25% were selected.Data from triplicate determinations of percent nitrogen, percent extract, and diastatic power indicated that replication in our laboratory testing is unnecessary.

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