Seed-coat color genes in six commercial varieties of beans
AuthorFrancis L. Smith
Author AffiliationsFrancis L. Smith was Professor of Agronomy and Agronomist in the Experiment Station, Davis.
Hilgardia 31(1):1-14. DOI:10.3733/hilg.v31n01p001. May 1961.
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Colored beans have a dominant pigmentation gene, P, which acts with a number of seed-coat color genes to give a vast array of seed-coat colors. If p is present in the homozygous state, the beans are white regardless of the color genes. Lamprecht, a Swedish worker, had a white-seeded line which had P. This P-white, he assumed, was colorless because it had none of the dominant color genes. Seed of a P-white, Line 214, was obtained from Lamprecht and was used in crosses with mottled, self-colored, and white-seeded commercial varieties. The genotypes of the F2 color segregants in these crosses were determined by studying the F3 progenies from each color type from each cross.
To account for the results obtained, it must be assumed that some of the P-white F3 segregants must have had Br and Rk (buff). Br has been found to be a brown modifier of Rk. Furthermore, the genetic effects of Rk were not shown unless the dominant color gene, G, was present. In a sense, then, both Rk and Br are modifier genes of G. The hypothesis that P-white beans carry no dominant color genes will have to be expanded to allow the presence of the dominant seed-coat modifier genes, Rk and Br. This study clarifies the genetic status of Rk, the existence of which was denied by Lamprecht.
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