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Effects of Alien Cytoplasms on Agronomic and Bread-Making Traits of Two Spring Wheat Cultivars¹

The genomes of ‘Chris’ and #x2018;Selkirk’, two hard red spring wheat (Triticum aestivum L.) cultivars, were substituted into the cytoplasms of Triticum macha L., T. dicoceoides Korn, Aegilops squarrosa L., Ae. cylindrica Host., Ae. ventricosa Tausch, and Ae. juvenalis Thell Eig by repeated backcrossing to produce ailoplasmic lines. T. mocha, T. dicoccoides and Ae. squarrosa cytoplasms generally did not greatly affect the agronomic or breadmaking quality traits studied. Ae. cylindrica, Ae. ventricosa, and Ae. juvenalis cytoplasms reduced yields although the plants appeared relatively normal. Ae juvenalis cytoplasm differed from Ae. squarrosa, Ae. cylindrica, and Ae. ventricosa cytoplasms by causing larger yield reductions. The hypothesis that Ae. squarrosa contributed the cytoplasm as well as the D-genome to Ae. cylindrica and Ae. ventricosa but not to Ae. juvenalis appears to be supported by these results. T. mocha, T. docoecoides, and Ae. squarrosa cytoplasms may be useful sources of cytoplasmic variability for broadening the genetic diversity of wheat.

Key Words: Triticum aestivum L. • Alloplasmic • Grain yield • Percent protein • Flour yield • Loaf volume

² Professor (Currently: research geneticist, SEA/AR, USDA, Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108) and professor of agronomy, Dep. of Agronomy, North Dakota State Univ., Fargo, ND 58102.

Received for publication March 9, 1978.

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