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

A Minireview

Robert M. Zablotowicz* and Krishna N. Reddy

USDA Agricultural Research Service, Southern Weed Science Research Unit, Stoneville, MS 38776



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  		Fig. 1. Shikimic acid pathway and the inhibition by glyphosate in plants and microorganisms. Dark arrows indicate the overall effects of glyphosate inhibition of 5-enolpyruvylshikimic acid-3-phosphate synthase (EPSPS) and pathways for accumulation of hydroxybenzoic acids (Moorman et al., 1992).

 


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  		Fig. 2. Inhibition of acetylene reduction activity in bacteroid preparations of three strains of Bradyrhizobium japonicum extracted from nodules of conventional soybean 7 d after application of 0, 5, and 10 mM glyphosate (Hernandez et al., 1999).

 


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  		Fig. 3. Effect of different glyphosate applications on acetylene reduction activity of field grown soybeans. Arrows indicate date of glyphosate application (unpublished data). Each point represents a mean of six replicates. Significant differences (LSD values at the 0.05 probability level are indicated in parentheses) were observed at Day 31 (11.5), Day 48 (13.6), and Day 54 (13.3).

 




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Vadose Zone Journal Journal of Plant Registrations
Journal of Natural Resources
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