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- Title
Alleviation of arsenic stress in pakchoi by foliar spraying of engineered nanomaterials.
- Authors
Wang, Yaoyao; Chen, Xingbei; Lin, Lu; Ge, Jingwen; Huang, Yuhong; Gu, Xueyuan
- Abstract
Addressing heavy metal contamination in leafy vegetables is critically important due to its adverse effects on human health. In this study, we investigated the inhibitory effects of foliar spraying with four nanoparticles (CeO2, ZnO, SiO2, and S NPs) on arsenic (As) stress in pakchoi (Brassica rapa var. Chinensis). The findings reveal that foliar application of ZnO NPs at 1 ~ 2.5 mg plant−1 and CeO2 NPs at 5 mg plant−1 significantly reduces As in shoots by 40.9 ~ 47.3% and 39.4%, respectively. Moreover, 5 mg plant−1 CeO2 NPs increased plant height by 6.06% and chlorophyll a (Chla) content by 30.2% under As stress. Foliar spraying of CeO2 NPs at 0.2–5 mg plant−1 also significantly enhanced superoxide dismutase (SOD) activity in shoots by 9.4 ~ 13.9%, lowered H2O2 content by 42.4 ~ 53.25%, and increased root protein contents by 79 ~ 109.2%. CeO2 NPs regulate the As(III)/As(V) ratio, aiding in As efflux from roots and thereby reducing As toxicity to plants. In vitro digestion experiments reveal that the consumption of CeO2 NPs carries the lowest health risk of As. In addition, foliar spraying of ZnO NPs at 1 ~ 2.5 mg plant−1 can suppress plant As uptake by modulating enzyme activity, reducing leaf damage, and enhancing chlorophyll content. The study demonstrates that high CeO2 NP concentrations and suitable ZnO NP concentrations can alleviate As toxicity in pakchoi, consequently reducing human health risks.
- Subjects
EDIBLE greens; METAL spraying; BOK choy; SUPEROXIDE dismutase; HEAVY metals
- Publication
Environmental Science & Pollution Research, 2024, Vol 31, Issue 36, p49185
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-024-34481-6