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022 _a0176-1617
040 _aMSU
_bEnglish
_cMSU
_erda
050 _aQK711.2 JOU
100 1 _aZulet, Amaia
_eauthor
245 1 0 _aFermentation and alternative oxidase contribute to the action of amino acid biosynthesis-inhibiting herbicides
_ccreated by Amaia Zulet, Miriam Gil-Monreal, Ana Zabalza, Joost T. van Dongen and Mercedes Royuela
264 1 _aAmsterdam:
_bElsevier GmbH,
_c2015.
336 _2rdacontent
_atext
_btxt
337 _2rdamedia
_aunmediated
_bn
338 _2rdacarrier
_avolume
_bnc
440 _aJournal of Plant Physiology
_vVolume 175
520 3 _aAcetolactate synthase inhibitors (ALS-inhibitors) and glyphosate (GLP) are two classes of herbicide that act by the specific inhibition of an enzyme in the biosynthetic pathway of branched-chain or aromatic amino acids, respectively. The physiological effects that are detected after application of these two classes of herbicides are not fully understood in relation to the primary biochemical target inhibition, although they have been well documented. Interestingly, the two herbicides’ toxicity includes some common physiological effects suggesting that they kill the treated plants by a similar pattern despite targeting different enzymes. The induction of aerobic ethanol fermentation and alternative oxidase (AOX) are two examples of these common effects. The objective of this work was to gain further insight into the role of fermentation and AOX induction in the toxic consequences of ALS-inhibitors and GLP. For this, Arabidopsis T-DNA knockout mutants of alcohol dehydrogenase (ADH) 1 and AOX1a were used. The results found in wild-type indicate that both GLP and ALS-inhibitors reduce ATP production by inducing fermentation and alternative respiration. The main physiological effects in the process of herbicide activity upon treated plants were accumulation of carbohydrates and total free amino acids. The effects of the herbicides on these parameters were less pronounced in mutants compared to wild-type plants. The role of fermentation and AOX regarding pyruvate availability is also discussed.
650 _aAcetolactate synthase inhibitors
650 _aArabidopsis thaliana
650 _aEthanol fermentation
700 1 _aGil-Monreal, Miriam
_eco-author
700 1 _aZabalza, Ana
_eco-author
700 1 _aVan Dongen, Joost T.
_eco-author
700 1 _aRoyuela, Mercedes
_eco-author
856 _uhttps://doi.org/10.1016/j.jplph.2014.12.004
942 _2lcc
_cJA
999 _c169322
_d169322