|Jmol-3D images||Image 1|
|Molar mass||181.13 g mol−1|
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Glufosinate or its ammonium salt DL-phosphinothricin is an active ingredient in several nonselective systemic herbicides such as Basta, Rely, Finale, Ignite, Challenge, and Liberty. It interferes with the biosynthetic pathway of the amino acid glutamine and with ammonia detoxification. It has been used in pre-harvest crop desiccation.
Some plants have been genetically modified for resistance to glufosinate. The gene which gives resistance to glufosinate is a bar or pat gene which was first isolated from two species of Streptomyces bacteria. There are glufosinate-resistant transgenic varieties of several crops, including cotton, canola, corn, soybean, sugarbeet, and rice. Of these, canola, cotton, soybean and maize are currently on the market. This includes Bayer's LibertyLink genes, used in over 100 hybrids.
Liberty Link crops
In response to Monsanto's hugely successful Roundup Ready crops, Bayer Crop Science released its own herbicide tolerant crops. The range of crops tolerant to the herbicide glufosinate include cotton, soybean, canola and corn. These crops are also known as Liberty Link crops.
One advantage to producing Liberty Link crops is that any glyphosate resistance encountered in problematic weeds, such as rye grass, is overcome due to glufosinate having a completely different mode of action.
Mode of action
Phosphinothricin is an glutamine synthetase inhibitor that binds to the glutamate site. Glufosinate-treated plants die due to a buildup of ammonia and a cessation of photosynthesis due to lack of glutamine.
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- "Interpretation of criteria for approval of active substances in the proposed EU plant protection regulation". Swedish Chemicals Agency (KemI). 2008-09-23. Retrieved 2013-03-20.
- "MEPs approve pesticides legislation". 2009-01-13. Retrieved 2013-02-22.
- "Glufosinate-ammonium". Bayer CropScience.