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An Efficient method for Transferring Genetic Male Sterility to Soybean Lines¹

An efficient method is outlined for transferring genetic male sterility to desirable genotypes of soybean [Glycine max (L.) Merr.]. The method requires no identification of male-sterile plants at flowering and no manual cross-pollination. Backcrnsses are accomplished through insect vectors in natural crossing blocks. Lines segregating for sterility, but homozygous recessive for a genetic marker, are surrounded by a recurrent parent with the gene dominant to the marker. The marker is used to identify progeny from the recurrent parent by male-sterile crosses. Self ed seed from those crosses are used to form a crossing block (along with the recurrent parent) in which segregating plants displaying the dominant marker are removed before fruit set. Thus, any male-sterile plant in the crossing block will be recessive for the genetic marker. Crosses of the recurrent parent to male-sterile plants can again be identified by the dominant genetic marker. Contamination is minimized by bordering the crossing block with plants recessive for the genetic marker. Appropriate population sizes and linkage effects are described.

Key Words: Glycine max (L.) Merr. • Breeding • Recurrrent selection

² Research geneticist, USDA-ARS, and assistant professor, Dep. of Crop Science; research agronomist, USDA-ARS, and associate professor, Dep. of Crop Science; and agricultural research technician, USDA-ARS, respectively; North Carolina State Univ., Raleigh NC 27650.

Received for publication March 26, 1982.