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ADDITIONAL INDEX WORDS. Phaseolus vulgaris, seedcoat genetics, Mayocoba dry beans ABSTRACT. The inheritance of corona and hilum ring color of common bean (Phaseolus vulgaris L.) was investigated in the reciprocal cross 'Wagenaarʼ (a Canario market class dry bean) x 'Mayocobaʼ (Mayocoba market class dry bean), where both parents were known to have seedcoat color genotype P (C r) gy J g b vlae Rk. 'Wagenaarʼ has greenish yel- low (GY) seedcoat (due to gy) except for purple (dark) corona (due to vlae) and reddish brown hilum ring (due to J), whereas 'Mayocobaʼ has an entirely GY seedcoat. Seeds produced on the F1 progeny plants had GY corona and reddish brown hilum ring. The F2 segregated for three phenotypic classes, the two parental classes and the F1 class, but the segregation did not fi t a 1:2:1 segregation ratio due to disturbed segregation. F3 progeny tests of 35 randomly selected F2 parents demonstrated that the two parental classes were true breeding and the F1 class segregated again (as in the F2) for the same three phenotypic classes. In spite of variable expressivity of GY color and disturbed segregation, the data support a single gene hypothesis, for which the tentative symbol Chr is proposed. Chr is dominant for changing purple corona to GY, but recessive for changing reddish brown hilum ring to GY. Thus, only one gene, Chr, controls the difference in seedcoat color between the market classes Canario and Mayocoba. An allelism test between Chr and Z (hilum ring color factor) is needed before a formal proposal for Chr can be made. Prakken (1970) summarized the genetics of seedcoat colors in common bean (Phaseolus vulgaris L.) other than red colors, and he reconciled the various systems of gene symbols used by various researchers. Subsequently, Prakken (1972) published his extensive work with red seedcoat colors and organized the entire body of seedcoat color genetics (Prakken, 1970, 1972) into two tables, one for the yellow-black series of colors and the other (a text table) for the red colors. One of the colors in the fi rst table is pale greenish yellow (canary), which was also called schamois by Lamprecht (1932). Thus, two distinct seedcoat colors were attributed to only one genotype. Bassett et al. (2002) discovered a new gene (Gy) producing greenish yellow seedcoat color and established that (pale) greenish yellow seedcoats have genotype P (C r) gy J g b vlae Rk, whereas the genotype of shamois (same as schamois) is P (C r) Gy J g b vlae Rk.

Inheritance of Yellow Corona and Hilum Ring in Seedcoats of Mayocoba Market Class Common Beans with Genotype P [C r] gy J g b vlae Rk