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Soybean Mutants with Increased Tolerance for Sulfonylurea Herbicides¹

Soybean [Glycine max (L.) Merr.] tolerance for residues of chlorsulfuron [2-chloro-N-[(4-methoxy-6-methyl-l,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide] would permit use of this small grain herbicide in regions where small grains and soybean are grown in rotation. A soybean mutation breeding program was conducted to induce, select, and characterize mutations giving increased genetic tolerance for chlorsulfuron and related sulfonylurca (SU) herbicides. Following seed mutagenesis with ethylnitrosourea (ENU) and subsequent selection, four mutant soybean lines with increased chlorsulfuron tolerance were isolated. Tolerance was conditioned by a single recessive gene in all four mutants. Allelic studies indicate that each mutation resides at one of three loci. Mutant 1-184A, which was studied most extensively, displayed more tolerance for preplant incorporated and postemergence levels of chlorsulfuron and a related sulfonylurea, chlorimuron ethyl [ethyl 2-[[[[(4-chloro-6-methoxypyrimidin 2-yl)amino]carbonyl]amino]sulfonyl]benzoate], than did ‘Williams’. Biochemical studies indicate that the mutants do not contain an altered form of acetolactate synthase (the site of action of these sulfonylurea herbicides).

Key Words: Herbicide resistance • Chlosulfuron • Chlorimuron ethyl • Glycine max (L.) Merr. • Mutation breeding

² Principal investigator, Du Pont Stine Crop Res. Lab, Newark, DE 19714; research supervisor, Du Pont Exp. Stn., Wilmington, DE 19898.

Received for publication August 8, 1986.

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