Single gene restoration of cytoplasmic male sterility in wheat and its implications in the breeding of restorer lines.

Cultivars of T. aestivum crossed onto two lines with male sterility induced by the cytoplasm of T. timopheevi gave a high level of restoration in the F1 generation. The ratio of fertile to sterile plants segregating in the F2 generation was consistent with that expected for a single dominant restorer gene. The possible association between this gene and mildew resistance or some other desirable character derived from 'CI 12633', a common ancestor of the cultivars used, is discussed.