Most plants of the Asgrow Mutable line of soybean are chimeric for flow-er color (Groose and Palmer, 1986). Mutable plants produce both entirely near-white and entirely purple flowers, as well as flowers of mutable phenotype with purple sectors on near-white petals. This line carries an unstable recessive ('mutable') allele of the w4 locus that conditions anthocyanin pigmentation (Weigelt et al., 1986)..pdf
Groose, R. W. and Palmer, Reid G.
"Research Notes : United States : New mutations in a genetically unstable line of soybean,"
Soybean Genetics Newsletter: Vol. 14
, Article 37.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol14/iss1/37