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The genes were developed by Bayer CropScience, before being sold to BASF Ag in late 2017. LibertyLink provides an herbicide resistance system that is still effective in the presence of glyphosate resistant weeds. [1] The gene which gives resistance to glufosinate is a bar or pat gene which was first isolated from two species of Streptomyces ...
The version used in genetically modified crops was isolated from Agrobacterium strain CP4 (CP4 EPSPS) that was resistant to glyphosate. [15] [16] The CP4 EPSPS gene was cloned and inserted into soybeans. The CP4 EPSPS gene was engineered for plant expression by fusing the 5' end of the gene to a chloroplast transit peptide derived from the ...
In 2004, a glyphosate-resistant variation of Palmer amaranth was found in the U.S. state of Georgia. [199] In 2005, resistance was also found in North Carolina. [200] The species can quickly become resistant to multiple herbicides and has developed multiple mechanisms for glyphosate resistance due to selection pressure.
Monsanto developed a glyphosate-resistant soybean that also expresses Cry1Ac protein from Bacillus thuringiensis and the glyphosate-resistance gene, which completed the Brazilian regulatory process in 2010. This is a cross of two events, MON87701 x MON89788. [18] [19]
Glyphosate disrupts the ability of most plants to construct new proteins. Glyphosate-tolerant transgenic crops are not affected. [7] A weed family that includes waterhemp (Amaranthus rudis) has developed glyphosate-resistant strains. A 2008 to 2009 survey of 144 populations of waterhemp in 41 Missouri counties revealed glyphosate resistance in 69%.
Some micro-organisms have a version of EPSPS that is resistant to glyphosate inhibition. One of these was isolated from an Agrobacterium strain CP4 (CP4 EPSPS) that was resistant to glyphosate. [144] [145] The CP4 EPSPS gene was engineered for plant expression by fusing the 5' end of the gene to a chloroplast transit peptide derived from the ...
The other is a gene from the Brucella anthropi strain LBAA, which encodes for the enzyme glyphosate oxidase (GOX). The CP4 EPSPS enzyme imparts high tolerance to glyphosate, so the plants can still create aromatic amino acids even after glyphosate is applied. GOX helps break down glyphosate within the plant. [2]
The biotechnology company Monsanto developed and patented a glyphosate-resistant gene for the canola plant which has the effect of producing canola that is resistant to glyphosate. Monsanto marketed the seed as Roundup Ready Canola .