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Inheritance of Chlorimuron Ethyl Sensitivity in the Soybean Strains BSR 101 and M74-462

Dep. of Agronomy, 1102 S. Goodwin Ave., Urbana, IL 61801

^* Corresponding author.

Initial work with the sulfonylurea herbicide chiorimuron ethyl (ethyl 2-][[[(4-chloro-6*methoxypyrimidin-2-yl) amino] carbonyl] amino] sulfonyl] benzoate) indicated that certain soybean [Glycine max (L.) Merr.] strains exhibited high levels of sensitivity to recommended field application rates. Knowledge of the mode of inheritance of chiorimuron ethyl sensitivity would allow for generation of cultivars toleranto chlorimuron ethyl. In addition, cross tolerance to other members of the suifonylureas has been observed and tolerance to chlorimuron ethyl may be expressed as tolerance to other sulfonylureas. Sensitive and tolerant strains of soybean were identified and two crosses of a tolerant strain ‘Elgin’ by the sensitive strains ‘BSR 101’ and M74-462 were evaluated in the F₂ and F₃ generations to determine the mode of inheritance of chlorimuron ethyl sensitivity. The F₂ plants and F₂-derived families in the F₃ generation from each of the crosses were evaluated in the greenhouse using a hydroponic culture. Three days after transplanting seedlings into Hoagland's solution, chlorimnron ethyl was added giving a concentration of 2 mg a.i. L^–1. Ten days after treatment, the plants were rated based upon reddening of the leaves. This evaluation indicated that chlorimuron ethyl sensitivity in both BSR 101 and M74-462 is conferred by a single recessive gene.

Key Words: Herbicide sensitivity • Glycine max (L.) Merr. • Soybean genetics • Sulfonylurea

Received for publication February 5, 1987.