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Four Genes Controlling Root Fluorescence in Soybean¹

As part of characterizing genetic diversity in soybean [Glycine max (L.) Merr.] germplasm, 572 accessions were evaluated for root fluorescence when exposed to ultraviolet light. Fifty-nine accessions did not exhibit root fluorescence. Only two other lines without root fluorescence had been identified previously. Lack of root fluorescence was more common in accessions from Europe (19%) than from Asia (3.4%). Genetic studies of the nonfluorescent accessions showed that four independent genes controlled the absence of root fluorescence. Three were recessive, fr_l, fr₂, and Fr₄, and one was dominant, Fr₃. Geographical distribution of the four genes was unequal; fr₁ was found in accessions from all geographical areas represented, Fr₃ and fr₄, were found only in accessions from Asia, and fr₂ was restricted to accessions from Europe.

Key Words: Glycine max (L.) Merr. • Germplasm • Evolution • Genetic variability

² Research scientist, International Plant Research Institute, San Carlos, CA, 94070; formerly postdoctoral research associate, and research geneticist, USDA, ARS, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011.

Received for publication April 27, 1981.

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