Abstract
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.
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