Nitrogen-modified atmosphere and re-aeration storage induce differential responses of antioxidant system linked to rice quality: An untargeted metabolomics study
Year: 2026
Type: article
Abstract: ABSTRACT Nitrogen-modified atmosphere storage (N 2 -MAS) is a common grain preservation technique. However, previous studies had shown that the quality of paddy rice after N 2 -MAS deteriorated more rapidly. To reveal the mechanism of this phenomenon, the antioxidant indicators of two rice varieties during high-concentration (HNM-RS, nitrogen volume fraction of 0.99) and low-concentration (LNM-RS, nitrogen volume fraction of 0.95) nitrogen modified atmosphere and re-aeration storage were investigated in this paper. It was shown that after re-aeration, the N 2 -MAS groups exhibited accelerated increases in fatty acid value (FAV), malondialdehyde (MDA) content, and electrical conductivity (EC). Antioxidant system analysis Faster declines in superoxide dismutase (SOD), peroxidase (POD) activities, glutathione (GSH), and total phenolics (TP) contents, as well as enhanced accumulation of superoxide anion (O 2 ‧ − ) and hydrogen peroxide (H 2 O 2 ) were proven in the N 2 -MAS groups. It was further demonstrated that in the conventional storage (CS) group, the levels of antioxidant-related compounds—such as shikimates and phenylpropanoids (iristectorin B, etc.) and terpenoids (obacunone, etc.) were significantly up-regulated, whereas the contents of fatty acid peroxidation products (13(S)-HODE, etc.) associated with oxidative stress were significantly down-regulated by untargeted metabolomics. The results provided a physiological and metabolic basis for optimizing storage strategies to maintain rice quality.
Source: LWT
Institution: Henan University of Technology
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: gold
Estimated APC paid: $3,240
Award: G49448937
OpenAlex ID: W7136038499