Abstract
Introduction
Micropollutants are increasingly monitored as their presence in the environment is rising due to human activities, and they are potential threats to living organisms.
Objectives
This study aimed at understanding the role of plants in xenobiotics removal from polluted environments by following xenobiotics metabolism in leaf tissues.
Methods
Different classes of micropollutants were investigated using liquid chromatography (LC) coupled to quadrupole-time of flight (Q-TOF) high resolution mass spectrometry (HRMS). The tissue localization of xenobiotics in the leaves of a spontaneous (not planted by humans) Salix alba growing near the water flux was further investigated using matrix-assisted laser desorption ionization (MALDI) mass spectrometry imaging (MSI).
Results
The LC-Q-TOF analysis revealed the distribution of micropollutants in three different compartments of a tertiary treatment wetland. When further investing the metabolic profile of S. alba leaves using MSI, different distribution patterns were observed in specific leaf tissues. Xenobiotic metabolites were predicted and could also be tentatively identified in S. alba leaves, shedding new light on the metabolic processes at play in leaves to manage xenobiotics uptake from a polluted environment.
Conclusion
Using complementary metabolomics approaches, this study performed a large-scale exploration of micropollutants spreading in the environment at the exit of a tertiary treatment wetland. The use of MSI coupled with the prediction of xenobiotic metabolites yielded novel insights into plant metabolism during chronical exposure to low doses of a mixture of micropollutants.
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Data availability
The datasets generated and analyzed during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
We acknowledge the Agence de l’Eau Rhin Meuse (AERM) and the village of Falkwiller for access to the wetland. We thank Dr. Charles Pineau and his collaborators for sharing their knowledge on the MSI workflow.
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CV prepared the plant samples, conducted the LC-Q-TOF and MSI data acquisition, analyzed MSI data, prepared the figures and wrote the manuscript. LM performed water and sludge sample preparation and data analysis, prepared the figures and discussed the manuscript. AW revised the manuscript. DH contributed to the design of the experiments and sample preparation, discussed the results and revised the manuscript.
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11306_2019_1572_MOESM1_ESM.xlsx
Dataset S1: Full annotations obtained from water, sludge and leaf samples analyzed by LC–MS and predicted metabolites annotated in MSI datasets. Supplementary material 1 (XLSX 1449 kb)
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Villette, C., Maurer, L., Wanko, A. et al. Xenobiotics metabolization in Salix alba leaves uncovered by mass spectrometry imaging. Metabolomics 15, 122 (2019). https://doi.org/10.1007/s11306-019-1572-8
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DOI: https://doi.org/10.1007/s11306-019-1572-8