Molecular markers useful for identifying, selecting, and/or providing soybean plants displaying tolerance, improved tolerance, or susceptibility to iron deficiency, methods of their use, and compositions having one or more marker loci are provided. Methods comprise detecting at least one marker locus, detecting a haplotype, and/or detecting a marker profile. Methods may further comprise crossing a selected soybean plant with a second soybean plant. Isolated polynucleotides, primers, probes, kits, systems, as well as soybean plants, seeds, and parts thereof are also provided.
