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Genetic Control of Root Fluorescence in Soybeans¹

We studied the genetic control of root fluorescence in soybeans [Glycine max (L.) Merr.]. Fluorescent roots emit a soft blue glow when exposed to ultraviolet light, while nonfluorescent roots exhibit the dark violet color of the light source. Two soybean varieties with fluorescent roots, 'Blackhawk' and 'Hawkeye,' and one variety with nonfluorescent roots, 'Minsoy,' were used.

Evaluation of F₁ plants, F₂ populations, and F₃ families from the crosses Blackhawk x Hawkeye, Blackhawk x Minsoy, and Hawkeye x Minsoy indicated that root fluorescence was controlled by a single gene. Fluorescence is completely dominant to nonfluorescence. The same allele for fluorescence is present in Blackhawk and Hawkeye. The symbol Fr will be used to designate the fluorescent gene.

Key Words: Glycine max (L.) • Dominance

² Associate Professor of Agronomy and Collaborator, Crops Research Division, ARS, USDA, Iowa State University; and Undergraduate Research Assistant, Iowa State University, respectively.

Received for publication March 22, 1971.