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Genetic Linkage in Soybeans. Linkage Group IV¹

The genetic linkage between three loci in soybeans was determined and established as Linkage Group IV. The loci involved were V₁, v₁ (normal chlorophyll variegated leaves); Na, na (ovate, lanceolate leaflets); and P₂,p₂ (normal, minute pubescence or "puberulence"). The order of genes was shown to be v₁-na-p₂. The combined recombination value for v₁ and na was 35.6 ± 0.9%, for na and p₂ was 26.4 ± 1.4%, and random assortment of v₁ and p₂ occurred. Greater frequency of 4.seeded pods was shown to be a pleiotropic effect of the gene that causes narrow leaflets.

Key Words: Recombination value • Variegated leaves • Narrow leaflets • Puberulene • Glycine max

² Office of Administrator, ARS, USDA, Washington, D.C. 20250.

Received for publication December 5, 1969.

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