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Fine mapping of the R SC14Q locus for resistance to soybean mosaic virus in soybean

Fine mapping of the R SC14Q locus for resistance to soybean mosaic virus in soybean,10.1007/s10681-011-0457-3,Euphytica,Ying Ma,Da-Gang Wang,Hai-Chao

Fine mapping of the R SC14Q locus for resistance to soybean mosaic virus in soybean  
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Soybean mosaic virus (SMV) disease is one of the most destructive soybean (Glycine max (L.) Merr.) diseases worldwide, causing yield losses and significant deterioration in seed quality. ‘Qihuang No.1’ has a wide resistance spectrum and is extensively used in breeding programs in China. The dominant SMV resistance gene R SC14Q from the cultivar Qihuang No.1 was previously mapped to a 4.2 cM region on soybean chromosome 13 (formerly linkage group (LG) F). Fine mapping of R SC14Q is essential for high efficiency of marker-assisted selection (MAS) and its map-based cloning. Residual heterozygous lines (RHLs) derived from a soybean recombinant inbred line (RIL) were used to fine map R SC14Q . The RILs were obtained from a cross between ‘Qihuang No.1’ (resistant) and ‘Nannong1138-2’ (susceptible). The genomic sequence in an approximately 6 cM interval between the markers Satt334 and Sct_033 flanking R SC14Q was used to develop five simple sequence repeats and two InDel markers. Linkage analysis between inoculation phenotype and genetic markers localized R SC14Q to the interval between Satt334 and MY750, with genetic distances of 0.6 and 0.5 cM, respectively, corresponding to a physical distance on the ‘Williams 82’ draft assembly (Glyma1.13) of 1.18 Mb. Based on the genes sequences in the R SC14Q locus region with predicted functions for resistance, one SNP marker, MY525, was developed between Satt334 and MY750. Thus, the genomic region containing the R SC14Q was further narrowed to a 616 kb interval.
Journal: Euphytica , vol. 181, no. 1, pp. 127-135, 2011
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