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Title: The genetics of the color pattern of seed coats in G19833, a Liborino class common bean

Author
item BASSETT, MARK - University Of Florida
item Miklas, Phillip - Phil
item CALDAS, GINA - International Center For Tropical Agriculture (CIAT)
item BLAIR, MATTHEW - International Center For Tropical Agriculture (CIAT)

Submitted to: Bean Improvement Cooperative Annual Report
Publication Type: Research Notes
Publication Acceptance Date: 3/5/2011
Publication Date: 4/5/2011
Citation: Bassett, M., Miklas, P.N., Caldas, G., Blair, M. 2011. The genetics of the color pattern of seed coats in G19833, a Liborino class common bean . Bean Improvement Cooperative Annual Report. 54:50-51.

Interpretive Summary: A fourth color modifying gene Rk can express with cu, but most of the color expressing alleles at Rk are recessive, except for Rkr (Bassett et al. 2010). Rk itself has no color expression. In genotypes with pattern expressed at C, the type of pattern is typically indicated by a superscript. For example, Cst indicates a seed that expresses cartridge buff over all the seed coat except for stripes, which express the color coded by the full seed coat genotype when free of cu effects. If the color were yellow brown, the full seed coat color genotype would be P T C J G b v Rk. In this paper where the materials presented do not differ or segregate genetically at certain genes, those genes will not be indicated in the seed coat genotypes presented. Specifically, the gene symbols P, T, and J will always be omitted because both parents carry the dominant gene at those loci. A brief summary of seed coat genetics is given in the previous companion paper..

Technical Abstract: In common bean, seed coat pattern can be expressed by several genes: P, T, C, and J (Bassett, 2007), but in this paper only the C locus will be considered. There is also a dominant gene R for (oxblood) red seed coats, which is very tightly linked to C, forming a ‘complex C locus.’ The cu gene expresses cartridge buff (pale beige) seed coat color that cannot be modified (u = unchangeable) by the three principal color modifying genes: G for yellow brown, B for mineral brown, and V for blue to black color. A fourth color modifying gene Rk can express with cu, but most of the color expressing alleles at Rk are recessive, except for Rkr (Bassett et al. 2010). Rk itself has no color expression. In genotypes with pattern expressed at C, the type of pattern is typically indicated by a superscript. For example, Cst indicates a seed that expresses cartridge buff over all the seed coat except for stripes, which express the color coded by the full seed coat genotype when free of cu effects. If the color were yellow brown, the full seed coat color genotype would be P T C J G b v Rk. In this paper where the materials presented do not differ or segregate genetically at certain genes, those genes will not be indicated in the seed coat genotypes presented. Specifically, the gene symbols P, T, and J will always be omitted because both parents carry the dominant gene at those loci. A brief summary of seed coat genetics is given in the previous companion paper..