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Inheritance of a Variegated Testa Color in Peanuts¹

Testa color in peanuts, Arachis hypogaea L., has a subjective value for market quality, and an understanding of testa color inheritance is prerequisite to breeding cultivars acceptable for marketing. The genetic relationship between two solid testa colors (pink and red) and their interaction with variegated (red/white) testa were investigated with progenies from intrasubspecific crosses involving nine parents. The variegation gene, V, was expressed as incompletely dominant to solid color and a 1:2:1 ratio was obtained from red x red/white crosses. The pink x red testa crosses gave the 1:2:1 ratio for the R₂ locus, In crosses of peanuts with pink x red/white testa, the F₂ segregation fit the 1:2:1:2:4:2:1:2:1 phenotypic, also genotypic, ratio — the distribution expected from two independent loci with incomplete dominance for each gene pair. The nine genotypes were: R₂R₂vv, R₂R₂Vv, R₂R₂VV, R₂r₂vv, R₂r₂Vv, R₂r₂VV, r₂r₂vv, r₂r₂Vv, r₂r₂VV. Linkage was not detected between any of the testa colors investigated.

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

² Assistant geneticist, Dep. of Agronomy, Univ. Georgia Coastal Plain Stn. and supervisory research geneticist, AR-SEA-USDA, Coastal Plain Stn., Tifton, GA 31793.

Received for publication February 7, 1980.

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