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Composite Breeding Methods and the DSM System in Cereals¹

The integration of the diallel selective mating system (DSM) is discussed in relation to overall project breeding operations. An overview of composite breeding and the role of competition is given as background. Composite breeding methods are shown to be efficient users of germplasm and effort; cultivars can be created in time periods comparable to other widely used methods. Competition is viewed as a helpful force in plant breeding. Important features of the DSM are a widening of the germplasm base of the breeding project and improved economy of operations. Implementation procedures of the DSM include: a) the objective basis for the system; b) the formation of DSM objective base composites; c) early generation field operations; and d) details of the selective mating option. The supplementary and reinforcing nature of the DSM are stressed relative to other known successful breeding methods.

Key Words: Diallel • Competition • Composite breeding • Selective mating • Mass Selection • Recurrent Selection • Germplasm • Breeding objectives

² Liberty Hyde Bailey Professor of Plant Breeding, Cornell Univ., Ithaca, NY 14853.

Received for publication January 9, 1978.