University of California

Inheritance of some seed-coat colors and patterns in lima beans


R. W. Allard

Author Affiliations

R. W. Allard was Associate Professor of Agronomy, Davis.

Publication Information

Hilgardia 22(5):167-177. DOI:10.3733/hilg.v22n05p167. June 1953.

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FIVE GENE PAIRS governing seed-coat color in lima beans and their relationships to some hypocotyl and flower-color genes are described. These genes are:

Cc—governs red vs. white seed-coat color; acts as a basic color factor in the production of colored hypocotyls, flowers, and other seed-coat colors.

Rr—produces dark-red seed-coat color and red hypocotyl color in the presence of C_.

Pp—produces purple seed-coat, purple hypocotyl, and purple flower color in the presence of C_.

C_R_P_—produces black seed-coat, red-purple hypocotyl, and purple flower color.

Ss—SS changes red, dark-red, purple, or black seed-coat color to red/buff, dark-red/buff, purple/buff, or black/buff, respectively. The heterozygote, Ss, produces a diffuse-type mottling, which can be distinguished from SS (restricted mottling) or ss (no mottling).

Srsr—modifies the background color associated with the mottle allele S; Sr_produces buff background color and srsr red background color. This gene pair is expressed only in the presence of SS or Ss. In mottled genotypes, the effect of the R and P alleles is largely confined to the mottled portions of the seed coat. However, individuals with black mottling generally have slightly darker background colors than individuals with red, dark-red, or purple mottles.

Variability among individuals in all of the color groups studied indicates the existence of some seed-coat color genes less effective than the ones described.

Literature Cited

Allard R. W. The inheritance of hypocotyl color in lima beans. Proc. Amer. Soc. Hort. Sci. 1952. 60:387-90.

Rhind D. A. A note on the inheritance of seed-coat color in Phaseolus lunatus L. Ind. Jour. Agr. Sci. 1933. 3:360-64.

Allard R. 1953. Inheritance of some seed-coat colors and patterns in lima beans. Hilgardia 22(5):167-177. DOI:10.3733/hilg.v22n05p167
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