There are currently 402 studies in the GENERA database.

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General Information

Document type
  • Peer-reviewed journal article
GE organism
  • soybean
GE trait
  • herbicide tolerance
Country
  • USA

Results

Equivalence
  • mixed
Safety for environment
  • mixed

Impact of Glyphosate on the Bradyrhizobium japonicum Symbiosis with Glyphosate-Resistant Transgenic Soybean Review Article

Zablotowicz, RM; Reddy, KN
Journal of Environmental Quality. 2004 May. 33(3):825-831

Link to full text (journal may charge for access)

DOI: 10.2134/jeq2004.0825

Abstract

Glyphosate-resistant (GR) soybean [Glycine max (L.) Merr.] expressing an insensitive 5-enolpyruvylshikimic acid-3-phosphate synthase (EPSPS) gene has revolutionized weed control in soybean production. The soybean nitrogen fixing symbiont, Bradyrhizobium japonicum, possesses a glyphosate-sensitive enzyme and upon exposure to glyphosate accumulates shikimic acid and hydroxybenzoic acids such as protocatechuic acid (PCA), accompanied with B. japonicum growth inhibition and death at high concentrations. In a series of greenhouse and field experiments, glyphosate inhibited nodulation and nodule leghemoglobin content of GR soybean. Glyphosate accumulated in nodules of field-grown GR soybean, but its effect on nitrogenase activity of GR soybean was inconsistent in field studies. In greenhouse studies, nitrogenase activity of GR soybean following glyphosate application was transiently inhibited especially in early growth stages, with the greatest inhibition occurring under moisture stress. Studies using bacteroid preparations showed that the level of glyphosate inhibition of bacteroid nitrogenase activity was related to in vitro glyphosate sensitivity of the B. japonicum strains. These studies indicate the potential for reduced nitrogen fixation in the GR soybean system; however, yield reductions due to this reduced N2 fixation in early stages of growth have not been demonstrated.

Keywords

herbicide; symbiont; nitrogen-fixing; yield

Funding

Funding source
  • Not reported
Funding country
  • Not reported
Funding type
  • Not reported

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Cite this study

MLA

Zablotowicz, RM, KN Reddy. "Impact of Glyphosate on the Bradyrhizobium japonicum Symbiosis with Glyphosate-Resistant Transgenic Soybean." Journal of Environmental Quality 33.3 (2004): 825-831. Web. 24 Sep. 2018.

APA

Zablotowicz, RM., & Reddy, KN. (2004). Impact of Glyphosate on the Bradyrhizobium japonicum Symbiosis with Glyphosate-Resistant Transgenic Soybean. Journal of Environmental Quality, 33(3), 825-831. doi:10.2134/jeq2004.0825

Please verify citations before use, citations are automatically generated based on information stored within the GENERA database and therefore may or may not be correct.