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Genetic Linkage in Soybeans: Linkage Group I¹

Genetic linkage of three genes in soybeans—y₁₂, a seedling chlorophyll deficiency gene, t, a pubescence color gene, and e₁,, a gene conditioning earliness and shortness—was established in Linkage Group I. The combined recombination value for y₁₂ and e_l was 20.2 ± 1.1%, for e₁ and t was 3.9 ± 0.4%, and for y₁₂ and t was 21.6 — 0.7%. Pubescence color, Tt, and a duplicate locus conditioning cotyledon color, D₂d₂, previously reported linked, were shown to be inherited independently. The order of genes in Linkage Group I appears to be y₁₂-e₁-t.

Key Words: Recombination value • Linkage intensity • Chlorophyll defiency • Pubescence color • Earliness and shortness • Cotyledon color • Glycine max

² Office of Administrator, Agricultural Research Service, USDA, Washington, D.C.

Received for publication July 5, 1969.