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Yield Evaluation of a Glyphosate-Tolerant Soybean Line after Treatment with Glyphosate

Monsanto Co., 700 Chesterfield Parkway N., St. Louis, MO 63198
Purdue Univ., West Lafayette, IN 47906
Jacob Hartz Seed Co., Stuttgart, AR 72160
Asgrow Seed Co., Kalamazoo, MI 49002
North Carolina State Univ., Raleigh, NC 27695
Univ. of Missouri, Columbia, MO 65211
Louisiana State Univ. Agric. Center, Baton Rouge, LA 70803
Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061
Mississippi State Univ., Stoneville, MS 38776
Univ. of Illinois, Urbana, IL 61801
Ohio State Univ., Columbus, OH 43210
Univ. of Minnesota, Lamberton, MN 56152
Clemson Univ., Clemson, SC 29634
Iowa State Univ., Ames, IA 50011
Univ. of Nebraska, Clay Center, NE 68933
Auburn Univ., Auburn, AL 36849

^* Corresponding author (xxdela{at}ccmail.monsanto.com).

Transformation of soybean [Glycine max (L.) Merr.] with a gene encoding a glyphosate-tolerance 5-enolpyruvylshikimate-3-phosphate synthase enzyme from Agrobacterium sp. strain CP4 resulted in the development of glyphosate-tolerant line 40-3-2. Glyphosate (N-phosphonomethyl glycine) is the active ingredient of Roundup herbicide. Line 40-3-2 was yield tested at 17 locations in 1992,23 locations in 1993, and 18 locations in 1994. At those locations, broadcast applications of glyphosate at various rates were made over 40-3-2 or its derivatives from early vegetative growth to pod fill. No significant yield reduction was observed as a result of the glyphosate treatment at any of the locations. Development of glyphosate-tolerant soybean promises to provide the farmer with access to a new weed control system that should result in lower production costs and reliable weed control under a wide range of conditions.

Received for publication January 18, 1995.

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