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Research Project: New Weed Management Tools from Natural Product-Based Discoveries

Location: Natural Products Utilization Research

Title: Lack of transgene and glyphosate effects on yield, and mineral and amino acid content of glyphosate-resistant soybean

item Duke, Stephen
item Rimando, Agnes
item Reddy, Krishna
item CIZDZIEL, JAMES - University Of Mississippi
item Bellaloui, Nacer
item SHAW, DAVID - Mississippi State University
item Williams, Martin
item Maul, Jude

Submitted to: Pest Management Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 5/20/2017
Publication Date: 5/25/2017
Citation: Duke, S.O., Rimando, A.M., Reddy, K.N., Cizdziel, J.V., Bellaloui, N., Shaw, D.R., Williams, M., Maul, J.E. 2017. Lack of transgene and glyphosate effects on yield, and mineral and amino acid content of glyphosate-resistant soybean. Pest Management Science. 74:1166-1173. https://doi.10.1002/ps.4625.

Interpretive Summary: There has been controversy over whether glyphosate affects mineral nutrition of glyphosate-resistant crops. In a two year field study with soybean, no effects of the glyphosate resistance transgene, glyphosate, or soils with a history of glyphosate use was found on mineral content of leaves or seed of soybean. Likewise, neither yield nor amino acid composition of seed were affected by these parameters.

Technical Abstract: There has been controversy as to whether the glyphosate resistance gene and/or glyphosate applied to glyphosate-resistant (GR) soybean affect mineral content (especially Mg, Mn, and Fe), yield and amino acid content of GR soybean. A two-year field study (2013 and 2014) examined these questions at sites in Mississippi, USA. There were no effects of glyphosate, the GR transgene, or field crop history (for a field with both no history of glyphosate use versus one with a long history of glyphosate use) on grain yield. Furthermore, these factors had no consistent effects on mineral content of leaves or harvested seed. Effects on minerals were small and inconsistent between years and appeared to be random false positives. No notable effects on free or protein amino acids of the seed were measured, although glyphosate and its degradation product, aminomethylphosphonic acid (AMPA), were found in the seed in concentrations consistent with previous studies.Neither glyphosate nor the GR transgene affect mineral nutrition, harvested seed amino acid composition, or yield of GR soybean. Furthermore, soils with a legacy of GR crops have no effects on these parameters in soybean.