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

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’ x R37 and ‘Pembina’ x R37, in estimates of variance components nor heritabilities. Of 60 comparisons between classification and measurement traits, only three were significant in Manitou x R37 and four in Pembina x 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.

Key Words: Heritability • Genetic correlation • Environmental correlation • Random lines

² Research scientists, Research Branch, Agriculture Canada, 25 Dafoe Rd., Winnipeg, Manitoba. R3T 2M9.

Received for publication January 23, 1974.

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