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Genetic Analyses of Nonfluorescent Root Mutants Induced by Mutagenesis in Soybean¹

Nonfluorescent root mutants in soybean [Glycine max (L.) Merr.] are useful as markers in genetic studies and in tissue culture research. Our objective was to obtain mutagen-induced nonfluorescent root mutants and to conduct genetic studies with them. Thirteen nonfluorescent mutants were detected among 154 016 seedlings derived from soybean lines treated with six mutagens. One of these mutants, derived from ‘Williams’ treated with 20 kR gamma rays, did not correspond to any of the known (standard) nonfluorescent spontaneous mutants. This is the first mutagen-induced nonfluorescent root mutant in soybean. It was assigned Genetic Type Collection no. T285 and the gene symbol fr5 fr5. The fr5 allele was not located on trisomics A, B, or C and was not linked to five chlorophyll-deficient mutants (y9, y11, y12, y13, and y20-k2) or flower color mutant w1. The remaining nonfluorescent root mutants were at the same loci as known spontaneous mutants; i.e., four had the fr1 allele, five had the fr2 allele, and three had the fr4 allele.

Key Words: Glycine max (L.) Merr. • Root fluorescence • Trisomic • Linkage

² Associate professor, Dep. of Grassland Science, Obihiro Univ., Obihiro City, Hokkaido, Japan; and research geneticist, USDA-ARS, Dep. of Agronomy and Dep. of Genetics, Iowa State Univ., Ames, IA 50011.

Received for publication June 16, 1986.