Figure 4.

RAC presence correlates with a stronger SCN‐resistance profile and the co‐presence of other loci that augment rhg1‐a resistance. (a) Proportion of RAC ⁺ (ss715606985 A SNP) versus RAC ^‐ (G SNP) accessions among 573 SCN‐phenotyped soybeans with consensus SoySNP50K SNP signatures predictive of rhg1‐a. *Note that none of the sampled RAC ^‐ (G SNP) accessions had rhg1‐a (none encoded α‐SNAP_Rhg1LC). “S”: susceptible in all trials, “MS”: moderately susceptible in at least one trial, “MR”: moderately resistant in at least one trial, “R”: resistant in at least one trial. Fisher's Exact Test pairwise comparisons: “R‐MR” (p = 2.6E‐4), “R‐MS” (p = 2.3E‐11), “R‐S” (p = 2.2E‐16), “MR‐MS” (p = 1.0), “MR‐S” (p = .25), “MS‐S” (p = 2.4E‐3). (b) Frequency of SNPs associated with Rhg4 (ss715602757, ss715602764) or the Chromosome 11‐encoded α‐SNAP intron‐retention (α‐SNAP_Ch11IR) allele, ss71559743 among 19,645 USDA accessions. (c) Frequency of the Rhg4 and α‐SNAP_Ch11IR associated SNPs among the 51 “Resistant” scored RAC ⁺ rhg1‐a signature accessions. (d) Frequency of the Rhg4 and α‐SNAP_Ch11‐IR associated SNPs among all RAC ⁺ (300) or RAC ^‐ (403) USDA G. max accessions with consensus SNP signatures predictive of rhg1‐a (705 total; two accessions undefined for ss715606985 SNP)