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Inheritance of the strong greenish-yellow (SGY) seedcoat color in `Wagenaar' common bean ( Phaseolus vulgaris  L.) was investigated. Line 5-593 is a determinate, Florida dry bean breeding line (with small black seeds) used as the recurrent parent in the development of many genetic stocks, e.g.,  g b v  BC 3  5-593. Through crosses with genetic tester stocks, the seedcoat genotype of `Wagenaar' was confirmed to be  C J g b v  lae   Rk . Three randomly amplified polymorphic DNA markers (OAP7 850 , OAP3 1400 , and OU14 950 ) that cosegregated with the  G  seedcoat color locus were developed from the F 2  population derived from the cross  g b v  BC 2  5-593 ×  G b v  BC 3  5-593. From the cross `Wagenaar' ×  g b v  BC 3  5-593, 80 F 2  plants were classified into 54 non-SGY and 16 SGY seedcoat color plants. When the OAP7 850  marker was applied to that population, linkage was not observed with the non-SGY and SGY phenotypes. Conversely, a molecular marker (OAP12 400 , that was developed from the F 2  from the cross `Wagenaar' ×  g b v  BC 3  5-593) linked to the locus controlling the SGY phenotype segregated independently of the  G  locus. Therefore, SGY phenotype is not controlled by the  G  locus. An F 3  progeny test of 76 F 2  plants from the cross `Wagenaar' ×  g b v  BC 3  5-593 confirmed the hypothesis that a single recessive gene (for which we propose the symbol  gy ) controls the seedcoat color change from pale greenish yellow (PGY) to SGY. Through crosses with genetic tester stocks, the seedcoat genotype of `Enola' was determined to be  C J g b v  lae   Rk . The test cross `Enola' × `Wagenaar' demonstrated that `Enola' also carries the  gy  gene. The relationship of `Enola' to the `Mayocoba' market class of common bean and to `Azufrado Peruano 87' is discussed.

Classical and Molecular Genetic Studies of the Strong Greenish Yellow Seedcoat Color in `Wagenaar' and `Enola' Common Bean