| Summary: | Reactive nitrogen species (RNS) are redox molecules important for plant defense against pathogens. The aim of the study was to determine whether the infection by the beet cyst nematode <i>Heterodera schachtii </i>disrupts RNS balance in <i>Arabidopsis thaliana</i> roots. For this purpose, measurements of nitric oxide (NO), peroxynitrite (ONOO<sup>−</sup>), protein <i>S</i>-nitrosylation and nitration, and nitrosoglutathione reductase (GSNOR) in <i>A. thaliana</i> roots from 1 day to 15 days post‑inoculation (dpi) were performed. The cyst nematode infection caused generation of NO and ONOO<sup>− </sup>in the infected roots. These changes were accompanied by an expansion of <i>S</i>‑nitrosylated and nitrated proteins. The enzyme activity of GSNOR was decreased at 3 and 15 dpi and increased at 7 dpi in infected roots, whereas the <i>GSNOR1 </i>transcript level was enhanced over the entire examination period. The protein content of GSNOR was increased in infected roots at 3 dpi and 7 dpi, but at 15 dpi, did not differ between uninfected and infected roots. The protein of GSNOR was detected in plastids, mitochondria, cytoplasm, as well as endoplasmic reticulum and cytoplasmic membranes. We postulate that RNS metabolism plays an important role in plant defense against the beet cyst nematode and helps the fine-tuning of the infected plants to stress sparked by phytoparasitic nematodes.
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