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Two Linked Genes for Soybean Mosaic Virus Resistance


Soybean mosaic virus (SMV) causes significant yield loss and seed quality deterioration in soybean. In the United States, SMV was classified into seven strains, G1 through G7, and three host resistance loci, Rsv1, Rsv3, and Rsv4, were identified. Rsv1 is the most common and diverse locus with 10 different alleles conferring differential plant reactions to SMV strains, and it was mapped to a very complex resistance-gene-rich region on chromosome 13 (LG F).

A recent study published in Crop Science evaluated whether Rsv1-y allele in York soybean belongs to the Rsv1 locus. The researchers provided the first evidence that Rsv1 and Rsv1-y are two tightly linked loci conferring resistance to different SMV strains. The Soybean Genetic Committee approved a new symbol of Rsv5 designated for the resistance gene in York to replace the original Rsv1-y allele assignment.

Due to the tight linkage between Rsv1 and Rsv5, the two genes most likely act as one genetic unit and can be easily transferred to the progeny. The two gene combination provides multiple resistance and durable protection against constantly evolving SMV strains.

Read the full article in Crop ScienceFree preview Aug 2 - Aug 9

Soybean plants with damage to leaves