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Fertility Restoration in Soft Winter Wheat Hybrids¹

The ability of a stable cytoplasmic male-sterile wheat (Triticum aestivum L.) to produce pollen-fertile hybrid progeny after pollination with a partially effective restorer parent was termed "ease of restoration" (EOR). Within the limits of measurement error, results using A/R crosses were equivalent to results nsing corresponding maintainer lines as pollen parents in R/B crosses.

Using R/B crosses, EOR was predicted for advanced breeding lines of the Michigan State Univ. wheat breeding program, for current and historical commercial cultivars of Michigan, and for entries of the 1973 Uniform Eastern Soft Wheat Nursery. The materials tested were predicted to vary widely for EOR. Only a small portion of variability in EOR could be accounted for by the presence of minor genes for restoration in the maintainer line. Practical uses of extreme EOR types are discussed. EOR is a genetically controlled trait for which prediction can be accomplished with a fair degree of accuracy using partially effective restorer tester lines as female parents.

Key Words: Triticum aestivum L. • Triticum timopheevi (Zhuk.) Zhuk. • Cytoplasmic male-sterility • Breeding techniques • Testcrosses

² Formerly assistant professor, Crop and Soil Sciences Dep., Michigan State Univ., East Lansing, MI 48823. Presently assistant plant breeder, The Atnalgamated Sugar Co., Nyssa, OR 97913.

Received for publication March 1, 1975.