The synthesis of random-mating soybean populations and their use in recurrent selection programs was enhanced by the discovery of the male sterile genotype, ms 1 ms 1 (Brim and Young, 1971; Brim and Stuber, 1973). At some point in such a recurrent selection program, a plant breeder usually wishes to select lines for testing from one or more of the improved populations . There is a difficulty in this, however, because the progeny of every fertile plant selected from a random mating population will segregate for male sterility.
Burton, J. W. and Brim, C. A.
"Research Notes: Selecting homozygous male fertile lines from an intermating
Soybean Genetics Newsletter: Vol. 4
, Article 26.
Available at: https://lib.dr.iastate.edu/soybeangenetics/vol4/iss1/26