HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Knapp, S. J. Articles by Cox, T. S. Search for Related Content PubMed Articles by Knapp, S. J. Articles by Cox, T. S. Agricola Articles by Knapp, S. J. Articles by Cox, T. S.

S_l Family Recurrent Selection in Autogamous Crops Based on Dominant Genetic Male-Sterility

Dep. of Crop Science, Oregon State Univ., Corvallis, OR 97331;
Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506

^* Corresponding author.

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 S₁ family recurrent selection schemes and expected selection responses for the dominant male-sterile program. There is no mechanism for intermating selected S₁ families in a dominant male-sterile program, other than manual emasculation and pollination, because S₁ families are completely fertile. We proposed various S₁ family recurrent selection schemes where intermating is done between selected S₁ families and a male-sterile allele source as a means for overcoming this problem. These schemes include S₁ family recurrent selection using the reference population as the male-sterile allele source and combined S₁ and half-sib or S₁ 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 S₁ family selection in a dominant genetic male-sterile program are that complete S₁ family fertility eliminates the problem of male-sterile phenotype pleiotropy and selection response per year is often greater for S₁ compared to mass or half-sib family recurrent selection. The weakness of S₁ family selection in a dominant compared to a recessive male-sterile program is that expected selection response is less than that for S₁ family selection in allogamous species where intermating is done strictly between S₁ selected families.

Key Words: Rapeseed • Brassica napus L. • Cotton • Gossypium hirsutum L. • Wheat • Triticum aestivum L. • Population improvement • Expected selection response

Received for publication April 5, 1987.