MON-ØØØ73-7 - Roundup Ready™ canola | BCH-LMO-SCBD-14795 | Living Modified Organism | Biosafety Clearing-House


Living Modified Organism (LMO)

Decisions on the LMO Risk Assessments  
published: 05 Jun 2006 last updated: 22 Jan 2014
Living Modified Organism identity
The image below identifies the LMO through its unique identifier, trade name and a link to this page of the BCH. Click on it to download a larger image on your computer. For help on how to use it go to the LMO quick-links page.
Roundup Ready™ canola
RT73 (GT73)
Glyphosate herbicide tolerant canola produced by inserting the epsps gene encoding the enzyme 5-enolypyruvylshikimate-3-phosphate synthase (EPSPS) and glyphosate oxidase (gox) from Ochrobactrum anthropi. These modifications confer tolerance to the herbicide glyphosate.
The term “Recipient organism” refers to an organism (either already modified or non-modified) that was subjected to genetic modification, whereas “Parental organisms” refers to those that were involved in cross breeding or cell fusion.
Cultivar: Westar (Standard variety used in the Western Canadian Cooperative Rapeseed Test (Co-Op Test))
  • MON-89249-2 - Roundup Ready™ canola
    | Monsanto | Resistance to herbicides (Glyphosate)
Characteristics of the modification process
  • Agrobacterium-mediated DNA transfer
Some of these genetic elements may be present as fragments or truncated forms. Please see notes below, where applicable.
  • BCH-GENE-SCBD-14979-7 5-enolpyruvylshikimate-3-phosphate synthase gene | Agrobacterium tumefaciens (Agrobacterium)
    Protein coding sequence | Resistance to herbicides (Glyphosate)
  • BCH-GENE-SCBD-14998-4 Glyphosate oxidoreductase gene | Ochrobactrum anthropi (OCHAN)
    Protein coding sequence | Resistance to herbicides (Glyphosate)
  • BCH-GENE-SCBD-101507-5 FMV 34S promoter | Figwort mosaic virus (Figwort mottle virus, FMV, CMoVb)
  • BCH-GENE-SCBD-100365-6 Chloroplast transit peptide 2 | Arabidopsis thaliana (Thale cress, Mouse-ear cress, Arabidopsis, ARATH)
    Transit signal
  • BCH-GENE-SCBD-101877-5 rbcS-E9 gene terminator | Pisum sativum (Garden pea, PEA)
  • BCH-GENE-SCBD-101902-4 rbcS Transit Peptide | Arabidopsis thaliana (Thale cress, Mouse-ear cress, Arabidopsis, ARATH)
    Transit signal
The Glyphosate oxidoreductase varies from the wild type version of the gene at 3 amino acid sites (G85S, R153K and R334H) and is designated as goxv247.

The EPSPS gene was codon optimised for plant expression.

PCR and southern blot analysis indicated that MON-ØØØ73-7 contains a single insertion event containing one copy of the T-DNA from plasmid PV-BNGT04. No genetic elements from outside of the right and left borders of the plasmid were transferred into or are present in the genomic DNA of the LMO.
LMO characteristics
  • Food
Additional Information
The epsps gene codes for the enzyme 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) that is present in all plants, bacteria and fungi. The epsps gene put into GT73 was isolated from strain CP4 of the common soil bacterium Agrobacterium tumefaciens and is a glyphosate tolerant form of EPSPS. The EPSPS enzyme is part of an important biochemical pathway in plants called the shikimate pathway, which is involved in the production of aromatic amino acids and other aromatic compounds. When conventional canola plants are treated with glyphosate, the plants cannot produce the aromatic amino acids needed to grow and survive. EPSPS is not present in mammals, birds or aquatic life forms, which do not synthesize their own aromatic amino acids. For this reason, glyphosate has little toxicity to these organisms. The EPSPS enzyme is naturally present in foods derived from plant and microbial sources.

The canola line GT73 contains a second gene that codes for a modified version of glyphosate oxidase (GOX) enzyme that is ubiquitous in nature. The goxv247 gene inserted into GT73 was isolated from strain LBAA of the bacterium Ochrobactrum anthropi. Glyphosate oxidase (GOX) enzyme accelerates the normal breakdown of the herbicide glyphosate into two non-toxic compounds, aminomethylphosphonic acid (AMPA) and glyoxylate. AMPA is the principal breakdown product of glyphosate and is degraded by several microorganisms, while glyoxylate is commonly found in plant cells and is broken down by the glyoxylic pathway for lipid metabolism.