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Two Major Genes for Time of Flowering and Maturity in Soybeans¹

Two independent gene pairs affecting time of flowering and maturity in soybeans (Glycine max (L.) Merr.) were identified and studied in a common genetic background developed by backcrossing to the commercial variety ‘Clark.’ E₁, a gene for lateness linked to pubescence color (T t), was transferred from strain T175, and e₂, a gene for earliness, from T245. The late allele at each locus was partially dominant in most combinations. Flowering and maturity dates for the homozygotes based on 2 years data at Urbana, Ill., are summarized below as number of days earlier (–) or later (+) than Clark.

Key Words: Glycine max (L.) Merrill • Ripening • Inheritance

² Research Geneticist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and Professor of Plant Genetics, Department of Agronomy, University of Illinois, Urbana, Ill. 61801.

Received for publication August 15, 1970.

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