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Molecular Markers Associated with T and Z, Two Genes Controlling Partly Colored Seed Coat Patterns in Common Bean

Dep. of Plant Sciences, North Dakota State Univ., Fargo, ND 58015
Horticultural Sciences Dep., Univ. of Florida, Gainsville, FL 32611
Dep. of Plant Sciences, North Dakota State Univ., Fargo, ND 58015

^* Corresponding author (mcclean{at}plains.nodak.edu).

Five genes control the expression of partly colored seed coat patterns in common bean (Phaseolus vulgaris L.), viz., T, Z, L, Bip, and J. Because these genes have complex interactions, giving various seed coat patterns, it is often difficult to assign specific effects to a particular gene. The problem is compounded by multiple alleles at T, Z, and L. Molecular markers linked to those pattern genes have the potential to assist in identifying the genes involved in specific interactions. We have begun a series of experiments to identify useful molecular markers linked to these genes. A group of three parental genotypes and five backcross lines were screened by random amplified polymorphic DNA (RAPD) techniques to identify putative markers. Potential markers were then mapped in appropriate BC₃-F₂ populations. To date, recombination has not been detected between RAPD markers OAM13₁₃₅₀, and OMI9₄₀₀ and the T gene. A single recombinant was detected between RAPD marker OAMl0₅₆₀ and the Z gene, and the marker mapped at a distance of 1.4 centimorgans (cM).

Received for publication August 11, 1997.

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