Abstract
This study evaluated the genetic composition of elite soybean [ Glycine max (L.) Merr.] cultivar Hefeng 25, and the genetic relationship between Hefeng 25 and its parents Hefeng 23 and Ke 4430-20. A total of 463 simple sequence repeat (SSR) markers were analyzed on 20 soybean linkage groups, and 177 SSR markers were monomorphic and 57 SSR loci were mutated (novel alleles to the parents). The overall genetic contributions of Hefeng 23 and Ke 4430-20 to Hefeng 25 were 39.4% and 48.3%, respectively. On the 20 linkage groups of Hefeng 25, alleles of loci tested originated differently. All alleles on linkage group G and most alleles on linkage group E were inherited from Ke 4430-20 and most alleles on linkage group L were from Hefeng 23. The combination of alleles on linkage groups in Hefeng 25 is conjectured in relation to the quantitative trait loci (QTLs) for favorable traits, such as yield and disease resistance, and has been selected during breeding process. For evaluating the effect of mutated loci on genetic purity, 12 seed samples of Hefeng 25 obtained from different companies were evaluated using 207 SSR markers including the markers for the 57 mutated loci. Only 4 seed samples had hybrid alleles at 13 loci, indicating that most of the mutated loci were purified. The elite genotype and high seed purity are probably the major factors for the long-term utilization in production of Hefeng 25.
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