Sl Family Recurrent Selection in Autogamous Crops Based on Dominant Genetic Male‐Sterility

Recessive genetic male‐sterility has been widely used to facilitate crossing in recurrent selection programs in autogamous crop species. Dominant genetic male‐sterility, on the other hand, has not been widely used. Mass and half‐sib family selection schemes have been described for the dominant male‐sterile program. Our objective was to describe S 1 family recurrent selection schemes and expected selection responses for the dominant male‐sterile program. There is no mechanism for intermating selected S 1 families in a dominant male‐sterile program, other than manual emasculation and pollination, because S 1 families are completely fertile. We proposed various S 1 family recurrent selection schemes where intermating is done between selected S 1 families and a male‐sterile allele source as a means for overcoming this problem. These schemes include S 1 family recurrent selection using the reference population as the male‐sterile allele source and combined S 1 and half‐sib or S 1 and full‐sib family recurrent selection using half‐sib or full‐sib families, respectively, as the male‐sterile allele source. Expected selection responses were described for selection of the same or different traits in different family types for combined family type selection schemes. The strengths of S 1 family selection in a dominant genetic male‐sterile program are that complete S 1 family fertility eliminates the problem of male‐sterile phenotype pleiotropy and selection response per year is often greater for S 1 compared to mass or half‐sib family recurrent selection. The weakness of S 1 family selection in a dominant compared to a recessive male‐sterile program is that expected selection response is less than that for S 1 family selection in allogamous species where intermating is done strictly between S 1 selected families.