Abstract
Glyphosate-resistant (GR) crops, commercially referred to as glyphosate-tolerant (GT), started the revolution in crop biotechnology in 1996. Growers rapidly accepted GR crops whenever they became available and made them the most rapidly adopted technology in agriculture history. Adoption usually meant sole reliance on glyphosate [N-(phosphonomethyl)glycine, CAS No. 1071-83-6] for weed control. Not surprisingly, weeds eventually evolved resistance and are forcing growers to change their weed management practices. Today, the widespread dissemination of GR weeds that are also resistant to other herbicide modes-of-action (MoA) has greatly reduced the value of the GR crop weed management systems. However, growers continue to use the technology widely in six major crops throughout North and South America. Integrated chemistry and seed providers seek to sustain glyphosate efficacy by promoting glyphosate combinations with other herbicides and stacking the traits necessary to enable the use of partner herbicides. These include glufosinate {4-[hydroxy(methyl)phosphinoyl]-DL-homoalanine, CAS No. 51276-47-2}, dicamba (3,6-dichloro-2-methoxybenzoic acid, CAS No. 1918-00-9), 2,4-D [2-(2,4-dichlorophenoxy)acetic acid, CAS No. 94-75-7], 4-hydroxyphenyl pyruvate dioxygenase inhibitors, acetyl coenzyme A carboxylase (ACCase) inhibitors, and other herbicides. Unfortunately, herbicide companies have not commercialized a new MoA for over 30 years and have nearly exhausted the useful herbicide trait possibilities. Today, glyphosate-based crop systems are still mainstays of weed management, but they cannot keep up with the capacity of weeds to evolve resistance. Growers desperately need new technologies, but no technology with the impact of glyphosate and GR crops is on the horizon. Although the expansion of GR crop traits is possible into new geographic areas and crops such as wheat and sugarcane and could have high value, the Roundup Ready® revolution is over. Its future is at a nexus and dependent on a variety of issues.
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Abbreviations
- ACCase:
-
Acetyl coenzyme A carboxylase
- ALS:
-
Acetolactate synthase
- EFSA:
-
European Food Safety Authority
- EPA:
-
Environmental Protection Agency
- GM:
-
Genetically modified
- GST:
-
Glutathione-S-transferase
- HPPD:
-
4-Hydroxyphenyl pyruvate dioxygenase
- HR:
-
Herbicide-resistant
- HT:
-
Herbicide-tolerant
- IP:
-
Intellectual property
- ISAAA:
-
International Service for the Acquisition of Agri-Biotech Applications
- NTO:
-
Nontarget organism
- NTSR:
-
Non-target site resistance
- PDS:
-
Phytoene desaturase
- PPO:
-
Protoporphyrinogen oxidase
- PSII:
-
Photosystem II
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Green, J.M., Siehl, D.L. (2021). History and Outlook for Glyphosate-Resistant Crops. In: Knaak, J.B. (eds) Reviews of Environmental Contamination and Toxicology Volume 255. Reviews of Environmental Contamination and Toxicology, vol 255. Springer, Cham. https://doi.org/10.1007/398_2020_54
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