Genotypes and phenotypes of soybean cultivars and mutant isolines used in this study.

All cultivars are homozygous for the alleles indicated. The varieties are searchable by the PI number in the USDA Germplasm Resources Information Network (GRIN). NA, not applicable.L numbers are isoline number designations. The rm allele from PI91073 that specifies a variegated phenotype had been repetitively backcrossed into the Clark brown seeded isoline L67-3484 (here designated as RM38 with the r allele) to create the variegated Clark isoline L72-2040 (here designated as RM55 with the rm) by R.L. Bernard of the USDA. The L72-2040 line demonstrated somatic and germinal instability to yield fully black seed. One of these lines is here designated as RM30 and the gene symbol R* is used to designated this revertants of the rm line from the standard R allele that specifics black seed coats.Genotypes and phenotypes of soybean cultivars and mutant isolines used in this study.