Abstract
Soybean mosaic virus (SMV) is the most prevalent viral pathogen and economic threat to soybean production worldwide. Three independent genes harboring SMV resistance have been identified: Rsv1, Rsv3, and Rsv4. Although the resistance genes (R‐genes) have been found in some germplasm, usually they provide protection to some, but not all, viral strains. The objective of this research was to identify a new source of SMV resistance in Korean soybean accession PI 438307. The soybean genotype PI 438307 was crossed with susceptible parent ‘Essex’ (rsv), and differential parents PI 96983 (Rsv1), L29 (Rsv3), and V94‐5152 (Rsv4). F2 plants and F2:3 lines derived from all four cross combinations were screened with SMV‐G7 strain. Additionally, F2 plants obtainSed from PI 438307 (R) × Essex (S) were genotyped with two simple sequence repeat (SSR) markers on chromosome 2 (MLG D1b). Inheritance and allelic studies revealed that resistance to SMV in PI 438307 is controlled by a single dominant gene allelic to the Rsv4 locus. PI 438307 exhibited unique symptomology when compared to reported Rsv4 alleles in V94‐5152, PI 88788 and Beeson. PI 438307 was resistant to SMV‐G1 through G6 and resistant at seedling stages to SMV‐G7. Therefore, it was proposed that the new allele Rsv4‐v might be assigned to the SMV resistance in this soybean accession. Soybean sources carrying Rsv4 alleles are rare among the soybean germplasm and confer resistance to all or most SMV strains; therefore, this allele may be a good choice for breeding programs in the future.
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