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Pakchoi (Brassica rapa L.) Modulates the Antioxidant System and Energy Metabolism in Response to 6PPD and 6PPD-Q

文献类型： 外文期刊

作者： Liu, Jinzheng;Liu, Weitao;Shi, Ruiying;Yu, Miao;Li, Xiang;Ge, Yichen;Wang, Xingshuo;Sun, Yuebing

作者机构：

关键词： amino antioxidant;phytotoxicity;defense mechanism;antioxidant system;energy metabolism

期刊名称： JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY

ISSN： 0021-8561

年卷期： 2025 年

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： The widespread presence of the emerging contaminants N-(1,3-dimethylbutyl)-N '-phenyl-p-phenylenediamine (6PPD) and its derivative 6PPD-quinone (6PPD-Q), along with their associated environmental risks, has garnered significant public concern. To assess the food safety risk of 6PPD and its oxidized product 6PPD-Q in the environment, we explored the effects of different concentrations (0.1, 1, 10, and 100 mu g/L) of 6PPD and 6PPD-Q on pakchoi (Brassica rapa L.). Preferential accumulation of 6PPD-Q was observed in pakchoi roots, reaching 159 ng/g under 100 mu g/L exposure. Pakchoi exhibited severe physiological damage, as evidenced by significantly reduced biomass, elevated levels of reactive oxygen species (ROS), and increased malondialdehyde (MDA) content. Elevated photosynthetic pigment content and antioxidant enzyme activities indicate the activation of the antioxidant system in pakchoi. Flavonoid metabolites were upregulated to participate in the resistance to oxidative stress induced by 6PPD-Q. In contrast, 6PPD specifically caused cysteine-related protective mechanisms. Furthermore, the energy metabolism of pakchoi was significantly adjusted. These findings provide insights into the defensive mechanisms employed by pakchoi against 6PPD and 6PPD-Q, offering new perspectives for assessing their phytotoxicity and environmental risk.

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