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Inheritance of self-colored and striped seedcoat mutants induced in Phaseolus vulgaris L.^*

Helio M. Barbosa^I; Marco A. Guimarães^II

^IDepartamento de Biologia Geral, Universidade Federal de Viçosa, 36570 Viçosa, MG, Brasil. Send correspondence to H.M.B.
^IIOCEPAR, Rodovia BR 467, Km 19.85800 Cascavel, PR, Brasil

ABSTRACT

The seedcoat color inheritance of ten ethyl methanesulfonate (EMS)-induced mutants in Phaseolus vulgaris L. was determined in the F₂ generation from crosses of each mutant with the original black-seeded variety. All mutants behaved as recessives. Monogenic inheritance was found for six mutants with uniformly colored seedcoats. There is evidence that one of these was caused by deletion. The F₂ generation from crosses between two other self-colored mutants or two variegated mutants with the parent variety segregated in the ratio 9 black: 3 yellowish-brown: 4 beige, indicating two mutated loci. Evidence is presented favoring the hypothesis that EMS-activated transposable elements, not yet described in Phaseolus, are the cause of stripes in variegated mutants.

Keywords: Inheritance; Mutants induced; Phaseolus vulgaris.

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* Part of a thesis submitted by M.A.G. to the Universidade Federal de Viçosa in partial fulfillment of the requirements for the M.S. degree.