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Appl Environ Microbiol. 1991 June; 57(6): 1799-1804
Copyright © 1991, American Society for Microbiology. All Rights Reserved.

Degradation of the Herbicide Glyphosate by Members of the Family Rhizobiaceae

C.-M. Liu*, P. A. McLean, C. C. Sookdeo and F. C. Cannon{dagger}

BioTechnica International, Inc., 85 Bolton Street, Cambridge, Massachusetts 02140

ABSTRACT

Several strains of the family Rhizobiaceae were tested for their ability to degrade the phosphonate herbicide glyphosate (isopropylamine salt of N-phosphonomethylglycine). All organisms tested (seven Rhizobium meliloti strains, Rhizobium leguminosarum, Rhizobium galega, Rhizobium trifolii, Agrobacterium rhizogenes, and Agrobacterium tumefaciens) were able to grow on glyphosate as the sole source of phosphorus in the presence of the aromatic amino acids, although growth on glyphosate was not as fast as on Pi. These results suggest that glyphosate degradation ability is widespread in the family Rhizobiaceae. Uptake and metabolism of glyphosate were studied by using R. meliloti 1021. Sarcosine was found to be the immediate breakdown product, indicating that the initial cleavage of glyphosate was at the C—P bond. Therefore, glyphosate breakdown in R. meliloti 1021 is achieved by a C—P lyase activity.

FOOTNOTES

* Corresponding author.

{dagger} Present address: Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114.

Appl Environ Microbiol. 1991 June; 57(6): 1799-1804
Copyright © 1991, American Society for Microbiology. All Rights Reserved.



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Copyright © 1991 by the American Society for Microbiology. All rights reserved.