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Inheritance of Testa Color Variegation in Peanut¹

The inheritance of testa color variegation was investigated in reciprocal crosses between the variegated (red on white) PI 274191 x solid red PI 371965 peanut (Arachis hypogaea L.) genotypes. F₂ phenotypic segregation was consistent with that of a genetic model for incomplete dominance at one locus, designated V. Microscopic examination showed that the V gene inhibited full cellular development of the outer red epidermal layer of the testa in certain regions. This inhibition exposed the underlying white cellular layer resulting in a variegated pattern. The homozygously recessive locus, v, does not prevent the r₂ locus from producing phenotypes with solid red color testa.

Key Words: Genetic ratio • Groundnut • Seedcoat • Incomplete dominance • Peanut

² Assistant geneticist, Dep. of Agronomy, Univ. of Georgia, Coastal Plain Stn., and supervisory research geneticist, SEA, USDA, Dep. of Agronomy, Coastal Plain Stn., Tifton.

Received for publication July 2, 1979.

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