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Type: Journal article
Title: Reactive oxygen species trigger the fast action of glufosinate
Author: Takano, H.K.
Beffa, R.
Preston, C.
Westra, P.
Dayan, F.E.
Citation: Planta: an international journal of plant biology, 2019; 249(6):1837-1849
Publisher: Springer-Verlag
Issue Date: 2019
ISSN: 0032-0935
Statement of
Hudson K. Takano, Roland Beffa, Christopher Preston, Philip Westra, Franck E. Dayan
Abstract: MAIN CONCLUSION:Glufosinate is primarily toxic to plants due to a massive light-dependent generation of reactive oxygen species rather than ammonia accumulation or carbon assimilation inhibition. Glutamine synthetase (GS) plays a key role in plant nitrogen metabolism and photorespiration. Glufosinate (C5H12NO4P) targets GS and causes catastrophic consequences leading to rapid plant cell death, and the causes for phytoxicity have been attributed to ammonia accumulation and carbon assimilation restriction. This study aimed to examine the biochemical and physiological consequences of GS inhibition to identify the actual cause for rapid phytotoxicity. Monocotyledonous and dicotyledonous species with different forms of carbon assimilation (C3 versus C4) were selected as model plants. Glufosinate sensitivity was proportional to the uptake of herbicide between species. Herbicide uptake also correlated with the level of GS inhibition and ammonia accumulation in planta even with all species having the same levels of enzyme sensitivity in vitro. Depletion of both glutamine and glutamate occurred in glufosinate-treated leaves; however, amino acid starvation would be expected to cause a slow plant response. Ammonia accumulation in response to GS inhibition, often reported as the driver of glufosinate phytotoxicity, occurred in all species, but did not correlate with either reductions in carbon assimilation or cell death. This is supported by the fact that plants can accumulate high levels of ammonia but show low inhibition of carbon assimilation and absence of phytotoxicity. Glufosinate-treated plants showed a massive light-dependent generation of reactive oxygen species, followed by malondialdehyde accumulation. Consequently, we propose that glufosinate is toxic to plants not because of ammonia accumulation nor carbon assimilation inhibition, but the production of reactive oxygen species driving the catastrophic lipid peroxidation of the cell membranes and rapid cell death.
Keywords: Glutamine synthetase
Ammonia accumulation
Light dependent
Lipid peroxidation
Description: Published online: 8 March 2019
Rights: © Springer-Verlag GmbH Germany, part of Springer Nature 2019
DOI: 10.1007/s00425-019-03124-3
Appears in Collections:Agriculture, Food and Wine publications
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