Search for new genes conferring resistance to SMV in soybean

【Objective】 The objective of this research was to search unique soybean germplasm for breeding programs.【Method】 The study was based on screening 254 genotypes collected from 26 countries with six SMV strains.【Result】 The results demonstrated that 158 genotypes were susceptible to SMV and 95 genotypes showed resistance to some strains of SMV.Only seven germplasm,Kaigen's kingenzu(PI 88486),PI 62202 and PI 407733 from China,Ito San(PI 189920) from France,PI 84549 from South Korea,and Shirome choutan(PI 417329) and Tousan 101(PI 507439) from Japan,showed resistance to all tested SMV strains.14 genotypes showed resistance or early-seedling-stage resistance to six strains and presumed carry Rsv4 allele,50 genotypes exhibited similar reaction patterns with known alleles to six strains of SMV,two genotypes at Rsv1,22 at Rsv1-k,16 at Rsv1-y,one at Rsv1-t,and 10 at Rsv3.25 genotypes showed distinct reaction patterns to six strains of SMV and presumably carry new alleles at the Rsv1,Rsv3,or Rsv4 locus.Research is underway to confirm the new resistance alleles via genetic study and molecular approach.【Conclusion】 The new identified genotypes resistant to SMV will be used as parents in the soybean breeding programs for resistance to SMV.