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Two types of resistant soybean ( Glycine max  (L.) Merr.) sources are widely used against soybean cyst nematode (SCN,  Heterodera glycines  Ichinohe). These include Peking-type soybean, whose resistance requires both the  rhg1-a  and  Rhg4  alleles, and PI 88788-type soybean, whose resistance requires only the  rhg1-b  allele. Multiple copy number of PI 88788-type  GmSNAP18 ,  GmAAT , and  GmWI12  in one genomic segment simultaneously contribute to  rhg1-b  resistance. Using an integrated set of genetic and genomic approaches, we demonstrate that the  rhg1-a  Peking-type  GmSNAP18  is sufficient for resistance to SCN in combination with  Rhg4 . The two SNAPs (soluble NSF attachment proteins) differ by only five amino acids. Our findings suggest that Peking-type  GmSNAP18  is performing a different role in SCN resistance than PI 88788-type  GmSNAP18 . As such, this is an example of a pathogen resistance gene that has evolved to underlie two types of resistance, yet ensure the same function within a single plant species.

The soybean GmSNAP18 gene underlies two types of resistance to soybean cyst nematode