Inheritance of the Two-points Pattern of Partly Colored Seedcoats in Common Bean

in Journal of the American Society for Horticultural Science

Common bean (Phaseolus vulgaris L.) seedcoats can have partly colored patterns such as the new two-points pattern, which has an unknown genotype. The gene tcf (derived from PI 507984) expresses partly colored seedcoat pattern with colored flowers. A genetic tester stock tcf two-points BC3 5-593 was derived from PI 507984 by backcrossing to the recurrent parent, Florida dry bean breeding line 5-593, which has black self-colored seeds and purple flowers due to the genotype T P V. A series of test crosses were made between tcf two-points BC3 5-593 and three genetic tester stocks: t z jers white BC3 5-593, t z bip bipunctata BC3 5-593, and t z virgarcus BC3 5-593. All three test crosses were studied in F1 and F2 populations, and the latter test cross in F3 progenies derived from 80 randomly selected F2 plants. The two-points pattern was never observed with white flower plants expressed by t/t, supporting the hypothesis that tcf is necessary for two-points expression. The complete genotype for two-points was found to be tcf z jers. The tcf gene expresses more extensive colored zones in partly colored seedcoats than t. For example, tcf z J expresses self-colored seedcoats, whereas tcf/t z J expresses white ends pattern and t z J expresses virgarcus. Similarly, the tcf z jers genotype expresses two-points pattern, whereas t z jers expresses white seedcoat; and tcf/-z J/jers expresses PI type pattern, whereas t z J/jers expresses weak virgarcus pattern.

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