期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 439, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.129640
关键词
Carbon nanotubes; Solanum nigrum L.; Cadmium and arsenic; Transcriptomic analysis; Metabolomic analysis
资金
- National Natural Science Foundation of China [32171612]
- Shanghai Science and Technology Innovation Action Plan Social Development Science and Technology Project [20dz1204804]
- Shanghai Science and Technology Innovation Action Project [20392001000]
- Yunnan Expert Workstation [202205AF150084]
- National Key Research and Development Program [2016YFD0800807]
This study demonstrates that the application of MWCNTs can promote the growth of Solanum nigrum, particularly under heavy metal stress, by increasing plant growth rate, enhancing antioxidative enzyme activity, regulating metabolic processes, and affecting reprogramming of defense systems.
Carbon nanotubes present potential applications in soil remediation, particularly in phytoremediation. Yet, how multi-walled carbon nanotubes (MWCNTs) induced hyperaccumulator growth at molecular level remains unclear. Here, physio-biochemical, transcriptomic, and metabolomic analyses were performed to determine the effect of MWCNTs on Solanum nigrum L. (S. nigrum) growth under cadmium and arsenic stresses. 500 mg/kg MWCNTs application significantly promoted S. nigrum growth, especially for root tissues. Specially, MWCNTs application yields 1.38-fold, 1.56-fold, and 1.37-fold enhancement in the shoot length, root length, and fresh biomass, respectively. Furthermore, MWCNTs significantly strengthened P and Fe absorption in roots, as well as the activities of antioxidative enzymes. Importantly, the transcriptomic analysis indicated that S. nigrum gene expression was sensitive to MWCNTs, and MWCNTs upregulated advantageous biological processes under heavy metal(loid)s stress. Besides, MWCNTs reprogramed metabolism that related to defense system, leading to accumulation of 4-hydroxyphenylpyruvic acid (amino acid), 4-hydroxycinnamic acid (xenobiotic), and (S)-abscisic acid (lipid). In addition, key common pathways of differentially expressed metabolites and genes, including tyrosine metabolism and isoquinoline alkaloid biosynthesis were selected via integrating transcriptome and metabolome analyses. Combined omics technologies, our findings provide molecular mechanisms of MWCNTs in promoting S. nigrum growth, and highlight potential application of MWCNTs in soil remediation.
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