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Inheritance of Coleoptile Length and Culm Length in Crosses Involving Olesen's Dwarf Spring Wheat

Coleoptile length and culm length inheritance were studied in F₁ and F₂ populations from spring wheat (Triticum aestivum L.) crosses involving ‘Olesen's Dwarf’ and five tall cultivars with relatively long coleoptiles. In F₂ populations studied both characters were quantitatively inherited. Broad-sense heritability estimates were high for culm length and coleoptile length. Dominance for short culm length was expressed in the O D X ‘Lee’ F₁, and coleoptile lengths of the F₁ of O D X Lee, O D X ‘10-VI-5’, and O D X ‘Chris’ exceeded those of their midparents. Both additive and nonadditive gene action was detected in all crosses except one. Calculated minimum gene numbers were higher for culm length than for coleoptile length. Significant phenotyplc correlations were obtained between culm length and coleoptile length; however, coefficient of determination values (r²) were low.

Key Words: Heritability • Gene action • Gene number • Phenotypic correlation

² Formerly Research Scientist (now Assistant Plant Breeder, The Amalgamated Sugar Co., Nyssa, Ore.), Professor of Plant Breeding, and Assistant Professor of Plant Breeding, respectively, Plant Science Division, University of Wyoming, Laramie 82070.

Received for publication May 30, 1972.