Abstract
Nowadays, there are two main types of herbicides that inhibit amino acid biosynthesis: glyphosate, which inhibits aromatic amino acid synthesis via specific inhibition of 5-enolpyruvyl-shikimate-3-phosphate synthase (EPSPS), and inhibitors of branched-chain amino acid synthesis that act via specific inhibition of acetolactate synthase (ALS). Both types of inhibitors share different aspects of their mode of action, such as the induction of fermentation. Although this physiological effect resembles the hypoxic stress response, it was detected under aerobic conditions and it was not related to a change in respiratory rates or to a decrease in the energy charge. Fermentative induction has also been detected after treatment with other compounds inhibiting amino acid biosynthesis, such as glufosinate or ketol-acid reductoisomerase inhibitors suggesting that it can be considered as part of a general plant response to the stress conditions caused by this kind of herbicide treatment. Fermentation seems to be part of the impaired carbon metabolism detected in these treated plants that prevent the optimal utilization of available carbohydrates and energy.
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Abbreviations
- ADH:
-
Alcohol dehydrogenase
- AEC:
-
Adenylate energy charge
- ALS:
-
Acetolactate synthase
- CPCA:
-
1,1-Cyclopropanedicarboxylic acid
- EPSPS:
-
5-Enolpyruvyl-shikimate-3-phosphate synthase
- KARI:
-
Ketol-acid reductoisomerase
- PDC:
-
Pyruvate decarboxylase
- RC:
-
Redox charge
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Zabalza, A., Royuela, M. (2014). Inducing Hypoxic Stress Responses by Herbicides That Inhibit Amino Acid Biosynthesis. In: van Dongen, J., Licausi, F. (eds) Low-Oxygen Stress in Plants. Plant Cell Monographs, vol 21. Springer, Vienna. https://doi.org/10.1007/978-3-7091-1254-0_20
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DOI: https://doi.org/10.1007/978-3-7091-1254-0_20
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