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Genetic Control of Hypocotyl Pigmentation among White-Flowered Soybeans Grown in Continuous Light¹

Seedlings of 64 white-flowered soybean (Glycine max L. Merr.) plant introductions, cultivars, and genetic lines were grown in continuous light of 505 µEm^–3S^–1. Tawny (T _ Td _) pubescent genotypes (22 samples) and light-tawny (T _ td td) pubescent genotypes (20 samples) had bronze pigmentation on the hypocotyl shortly after emergence. Gray (t t Td _ or t t td td) pubescent genotypes (22 samples) had no detectable bronze pigmentation.

Reciprocal F₁ hybrids of tawny pubescent plants and gray pubescent plants had bronze hypocotyl color and tawny pubescence. In the F₂ generation, plants with bronze hypocotyl color invariably had tawny pubescence, while all plants with green hypocotyls had gray pubescence. The T locus has a pleiotropic effect on hypocotyl color and on pubescence color which was detected in white-flowered soybeans. This relationship was constant in all tested populations and suggests a simple, rapid, and inexpensive method of detecting certain off-types in whiteflowered soybean populations at the seedling stage.

Key Words: Glycine max L. Merr. • Pleiotropy • Pubescence color • Inheritance

² Research geneticist, SEA, USDA, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011 and plant physiologist, Seed Standardization Branch, AMS, USDA, Beltsville, MD 20705.

Received for publication July 27, 1978.