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Interaction of Genetic Factors for Fertility Restoration in Hybrid Wheat¹

Four different sources of genes for fertility restoration in wheat, Triticum aestivum L. em Thell., were intermated to study the interaction of these genes in the heterozygous condition compared to their homozygous parents. Parents and hybrids were evaluated for pollen production and dispersal in the laboratory on excised spikes from plants grown under field and greenhouse environments. Seed set was also evaluated in diverse controlled environments.

Parental restorer sources showed variation for pollen production and dispersal as well as for seed set. Hybrids heterozygous for restorer genes from single sources were inferior to their homozygous parents and to the restorer x restorer hybrids. Most combinations of the different sources of fertility restoration in the hybrid were equal or superior to their homozygous parents for pollen production and dispersal and for seed production. The best combinations of restorers were of Triticum timopheevi/ *3‘Marquis’ parents with parents TBR 26 or TBR 76.

Both general combining ability and specific combining ability were highly significant for pollen production characters and for seed set. General combining ability for all characters except total pollen production made up the major portion of the total genetic variability.

Key Words: Triticum aestivum • Pollen • Male sterility

² Assistant professor, Dep. of Agronomy, Univ. of Maryland, College Park, MD 20742 (formerly graduate research assistant, Purdue Univ.) and professor of agronomy, Purdue Univ., respectively

Received for publication February 17, 1976.