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Respiratory burst o...
Respiratory burst oxidases and apoplastic peroxidases facilitate ammonium syndrome development in Arabidopsis
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- Podgórska, Anna (author)
- University of Warsaw
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- Burian, Maria (author)
- University of Warsaw
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- Dobrzyńska, Katarzyna (author)
- University of Warsaw
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- Rasmusson, Allan G. (author)
- Lund University,Lunds universitet,Molekylär cellbiologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Växtbiologi,Forskargrupper vid Lunds universitet,Molecular Cell Biology,Department of Biology,Faculty of Science,Plant Biology,Lund University Research Groups
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- Szal, Bożena (author)
- University of Warsaw
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(creator_code:org_t)
- Elsevier BV, 2021
- 2021
- English.
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In: Environmental and Experimental Botany. - : Elsevier BV. - 0098-8472. ; 181
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http://dx.doi.org/10...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Ammonium-nitrogen (NH4+) nutrition is linked to metabolic over-reduction for plants. The characteristic symptom of sole NH4+ nutrition is growth suppression, signifying this condition as the ammonium syndrome. In the present study, we investigated the mechanism of perception of high NH4+ conditions in Arabidopsis thaliana plants by examining apoplastic reactive oxygen species (ROS) metabolism. Major enzyme activity and a special pattern of expression of NADPH-dependent respiratory burst oxidases (RBOH) was found in Arabidopsis individuals cultured under NH4+ as the sole nitrogen source. This oxidative burst is independent of RBOHD/F expression and does not activate typical intracellular signalling pathways. In addition, elevated superoxide dismutase and apoplastic secretory peroxidase activities contributed to hydrogen peroxide (H2O2) accumulation in plants exposed to NH4+ nutrition. Consequently, higher H2O2 contents were determined in the extracellular space and were localised cytochemically. H2O2 is a substrate for cell wall cross-linking peroxidases, which showed enhanced activity in the presence of NH4+. Increase of cell wall polymerisation, could in turn inhibit cell elongation and slow down growth, as observed under NH4+ toxicity.
Subject headings
- NATURVETENSKAP -- Biologi -- Botanik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Botany (hsv//eng)
Keyword
- Ammonium toxicity
- Apoplastic reactive oxygen species
- Cell wall peroxidase
- Cell wall polymerisation
- Respiratory burst oxidase homolog
- Stress perception
Publication and Content Type
- art (subject category)
- ref (subject category)
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