Glyphosate-Tolerant Soybeans Remain Compositionally Equivalent to Conventional Soybeans (Glycine max L.) during Three Years of Field Testing

Abstract

Previous studies have shown that the composition of glyphosate-tolerant soybeans (GTS) and selected processed fractions was substantially equivalent to that of conventional soybeans over a wide range of analytes. This study was designed to determine if the composition of GTS remains substantially equivalent to conventional soybeans over the course of several years and when introduced into multiple genetic backgrounds. Soybean seed samples of both GTS and conventional varieties were harvested during 2000, 2001, and 2002 and analyzed for the levels of proximates, lectin, trypsin inhibitor, and isoflavones. The measured analytes are representative of the basic nutritional and biologically active components in soybeans. Results show a similar range of natural variability for the GTS soybeans as well as conventional soybeans. It was concluded that the composition of commercial GTS over the three years of breeding into multiple varieties remains equivalent to that of conventional soybeans.

Resíduos de glifosato e ácido aminometilfosfônico e teores de isoflavonas em soja BRS 244 RR e BRS 154

“…De modo similar, Mccann et al (2005) verificaram que os teores médios e variações de isoflavonas entre 25 variedades de soja GM RR e 25 variedades não modificadas obtidas da Monsanto nas safras de 2000, 2001 e 2002 foram similares dentro de cada safra, mas variando entre safras.…”

Are Ready for Market Genetically Modified, Conventional and Organic Soybeans Substantially Equivalent as Food and Feed?

“…This shortcoming was corrected in some studies, which claimed Roundup Ready soybeans to be substantially equivalent to non-GM soybeans (Harrigan et al 2007;McCann et al 2005). A similar shortcoming is found in feeding studies.…”

Phytoestrogens in foods on the Nordic market

“…These programs have involved measurement of key components such as isoflavones from different 40-3-2 varieties (the event crossed into various commercial genetic backgrounds of different maturity classes) grown across diverse geographical regions. McCann et al (2005) and Zhou et al (2011a) Because it is typical for nutrients and anti-nutrients in crops to vary depending on variety (genetic background), the environmental conditions and cultivation method used (Setchell & Cole, 2003;De Mejia et al, 2003;Zhou et al, 2011b), and the glyphosate-tolerant and control soybeans in these studies were not matched for genetic background and were grown under different environmental conditions (not grown at the same field trial site during the same season), the studies were not appropriately designed to compare whether the introduction of the glyphosate tolerant trait in the soybean had resulted in altered levels of isoflavones. Nevertheless, the study indicates that the isoflavone composition of commercialised glyphosate-tolerant soybeans over several years of breeding into multiple genetic backgrounds remains substantially equivalent to that of conventional soybeans.…”