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Szepesi, Á.* ; Bakacsy, L.* ; Fehér, A.* ; Kovács, H.* ; Pálfi, P.* ; Poór, P.* ; Szőllősi, R.* ; Gondor, O.K.* ; Janda, T.* ; Szalai, G.* ; Lindermayr, C. ; Szabados, L.* ; Zsigmond, L.*

L-aminoguanidine induces imbalance of ROS/RNS homeostasis and polyamine catabolism of tomato roots after short-term salt exposure.

Antioxidants 12:16 (2023)

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	Open Access Gold

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Polyamine (PA) catabolism mediated by amine oxidases is an important process involved in fine-tuning PA homeostasis and related mechanisms during salt stress. The significance of these amine oxidases in short-term responses to salt stress is, however, not well understood. In the present study, the effects of L-aminoguanidine (AG) on tomato roots treated with short-term salt stress induced by NaCl were studied. AG is usually used as a copper amine oxidase (CuAO or DAO) inhibitor. In our study, other alterations of PA catabolism, such as reduced polyamine oxidase (PAO), were also observed in AG-treated plants. Salt stress led to an increase in the reactive oxygen and nitrogen species in tomato root apices, evidenced by in situ fluorescent staining and an increase in free PA levels. Such alterations were alleviated by AG treatment, showing the possible antioxidant effect of AG in tomato roots exposed to salt stress. PA catabolic enzyme activities decreased, while the imbalance of hydrogen peroxide (H₂O₂), nitric oxide (NO), and hydrogen sulfide (H₂S) concentrations displayed a dependence on stress intensity. These changes suggest that AG-mediated inhibition could dramatically rearrange PA catabolism and related reactive species backgrounds, especially the NO-related mechanisms. More studies are, however, needed to decipher the precise mode of action of AG in plants exposed to stress treatments.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords L-aminoguanidine ; Copper Amine Oxidases ; Hydrogen Sulfide ; Inhibitor ; Nitric Oxide ; Polyamines ; Salt Stress ; Tomato; Nitric-oxide; S-nitrosylation; Reactive Oxygen; Abiotic Stress; Salicylic-acid; Abscisic-acid; Plant; Salinity; Tolerance; Biosynthesis

ISSN (print) / ISBN 2076-3921

e-ISSN 2076-3921

Journal Antioxidants

Quellenangaben Volume: 12, Issue: 8, Article Number: 16

Publisher MDPI

Publishing Place St Alban-anlage 66, Ch-4052 Basel, Switzerland

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Biochemical Plant Pathology (BIOP)
Institute of Lung Biology (LHI)

Grants Institute of Balassi
State of Hungary through the European Social Fund
European Union
National Research, Development and Innovation (NRDI) Office of the Hungarian Ministry