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Segregation for male sterility was observed in an F3 line of the soybean, Glycine max (L.) Merr., cross L67-533 x SRF 300 and designated as the Urbana Male Sterile (UMS). Segregation in this line and between- and within family segregation the following generation indicated UMS was controlled by a single recessive gene pair. Crosses made with the North Carolina Male Sterile (NCMS), ms1ms2, suggested that UMS and NCMS were controlled by the same gene or a different allele at the same locus. Male-sterile plants of UMS had higher levels of female fertility than did male-sterile plants of NCMS in various genetic backgrounds and in two diverse environments. The increased female fertility of the UMS male-sterile plants was expressed as a higher frequency of plants with at least one 3-seeded pod and a lower frequency of plants with no seed.
Key Words: Glycine max (L.) Merr. Male sterility
2 Assistant professor, Dep. of Agronomy, Univ. of Georgia, Athens, and research agronomist, ARS/USDA, Agronomy Dep., Ohio Agric. Res. and Development Center, Wooster, OH 44691.
Received for publication June 20, 1977.
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