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Inheritance of Glaucousness and Epicuticular Wax in Durum Wheat

Research Station, Agriculture Canada, Swift Current, SK, Canada, S9H 3X2

^* Corresponding author.

Glaucousness, the waxy bloom on the surface of leaves and other plant parts, is associated with amount of grain yield in wheat (Triticum spp.), and quantity of epicuticular waxes is associated with water loss through the cuticle, wettability by pesticide sprays, and disease susceptibility. The inheritance of glaucousness and epicuticular wax quantity is not well understood in durum wheat (T. turgidum L. var. durum). Crosses were made among diverse glaucous (gl) and nonglaucous (ng) genotypes, and in some cases, the F₁ was backcrossed to each parent. Segregation for visible glaucousness was observed in the field in the parental, F₁, F₂, and BC₁F₁ generations. Epicuticular wax quantity was determined gravimetrically in the parental, F₁, F₂ and BC₁F₁ generations of the cross ‘Hugenot G’/‘Hugenot W’ and the parental and F₁ generations of six other crosses. With the exception of crosses involving the ng parent Hugenot G, gl by ng crosses indicated that nonglaucousness is controlled by a single, completely dominant gene, as has previously been reported. Crosses with Hugenot G showed codominance of glaucousness and nonglancousness, and the heterozygote was of intermediate glaucousness. Epicuticular wax quantity of the cross Hugenot G/Hugenot W seemed to be controlled by the same codominant alleles, and the mean wax quantities of the parents, F₁, F₂, and BC₁F₁ agreed with expectation. Similarly, wax quantity of the other gl by ng crosses indicated that wax quantity was controlled by either the same gene as visible glaucousness or a tightly linked gene

Received for publication April 5, 1993.