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Inheritance of Genes Controlling Male-Fertility Restoration in the Wheat Cultivar Primépi¹

The French winter wheat (Triticum aestivum) cultivar, ‘Primépi,’ is an effective source of male-fertility restoration for Triticum aestivum (Zhuk.) Zhuk.—derived cytoplasmic male-sterility. We studied and determined the number and action of restorer genes by observing fertility segregation in F₂ and backcross populations involving crosses of cytoplasmic male-sterile ‘Gage’ (cmst Gage) and Primépi. Observed data from both populations indicate that genes at two loci control fertility restoration. Complete restoration was expressed when both genes were present, either in the homozygous or heterozygous condition. The heterozygote or homozygote alone of either of the two genes was incompletely fertile, yielding seed set percentages less than 97%. One gene, heterozygous alone, may have contributed less fertility than the other gene and could be classified as minor. The high fertility levels achieved with the two restorer genes from Primepi indicate that this restorer would be valuable for hybrid-wheat programs in latitudes similar to those of the Nebraska wheat-growing area.

Key Words: Hybrid wheat • Cytoplasmic male-sterility

² Former Graduate Research Assistant, Department of Agronomy, University of Nebraska-Lincoln (now Instructor, Department of Agronomy, North Dakota State University, Fargo, ND 58102), Professor of Agronomy, University of Nebraska-Lincoln, and Research Agronomist, North Central Region, ARS, USDA, Lincoln, NE 68503.

Received for publication November 5, 1973.