Variation and Covariation of Agronomic and Quality Traits in Two Spring Wheat Populations1

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Abstract
Random F5‐derived F7 lines from each of two related crosses of spring wheat, Triticum aestivum (L.) em. Thell., were grown in replicated tests in each of 2 years. Three types of traits were measured: a) classification traits (rust resistance, awnedness, waxiness, spike type, spike density, and lodging resistance); b) agronomic measurement traits (height, maturity, kernel weight, and yield); and c) quality measurement traits (flour nitrogen, sedimentation value, mixograph development time, mixograph peak height, and centrifuge absorption).There were no significant differences between the two crosses, ‘Manitou’ ✕ R37 and ‘Pembina’ ✕ R37, in estimates of variance components nor heritabilities. Of 60 comparisons between classification and measurement traits, only three were significant in Manitou ✕ R37 and four in Pembina ✕ R37. There was no significant relationship between yield and awnedness nor between yield and nitrogen content. The cross mean differed significantly from the mid‐parent value in only one of 14 cases. Estimates of genetic variances did not differ between crosses for any of the traits studied.

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