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The association between phenanthrene and nutrients uptake in lotus cultivar 'Zhongguo Hong Beijing'

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Abstract

It has been well documented that polycyclic aromatic hydrocarbon (PAHs) can be taken up from the environment by the plants and translocated into the shoots. However, the mechanisms underlying this process are poorly understood. Nelumbo nucifera L. (lotus) is a highly ornamental aquatic plant known to possess strong phytoremediation capability. In the present study, the association between phenanthrene (Phe) and nutrients, including nitrogen (N) and phosphorus (P), in lotus was investigated. Over 2 years, all eight lotus cultivars tested accumulated Phe to various degrees when grown in PAH-polluted sediment (0.46 mg/kg Phe). Cluster analysis showed N. nucifera 'Zhongguo Hong Beijing (ZHB)' was the one with the highest Phe levels in the leaves and petals in 2 years. The Phe concentrations in the tissues of 'ZHB' were 3.14 mg/kg and 1.63 mg/kg on average in the first and second year, respectively. Interestingly, 'ZHB' was also the cultivar with the lowest N and P levels considering 2 years and tissues. Hydroponic studies further revealed a negative association between the concentrations of Phe and those of N and P in the aerial tissues under 0.5 and 1.0 mg/L Phe treatments in 'ZHB'. Furthermore, the significant reductions of the roots number (72.6%), longest root length (75.8%), and petiolar height (34.6%) in 'ZHB' seedlings exposed to 1.0 mg/L Phe were observed, indicating that Phe retarded the growth of lotus. These results provide a new understanding of the accumulation of Phe in plants and the association with nutrients and enrich the basis of phytoremediation to the contaminated environment.

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Acknowledgements

The authors would like to thank the Tianheyuan Lotus Research Base for kindly providing all the lotus materials.

Funding

This work was supported by the National Natural Science Foundation of China (42107428, 31772346, 31971710, 32071829), the National Key Research and Development Program of China (2019YFD0900702), a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, and an International Workshop on the nexus of food-energy-water (FEWS) systems, USA-China (20191J006).

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XW: Methodology, performance of the experiments, data analysis, writing — original draft. YW, XZ1, BC, NK: Performance of the experiments, data analysis. LS, XZ2: Literature search, writing — review and editing. YX: Conceptualization, supervision, project administration, resources, writing — review and editing. FH: Conceptualization, supervision, writing — review and editing.

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Correspondence to Yingchun Xu.

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Wang, X., Wang, Y., Zhao, X. et al. The association between phenanthrene and nutrients uptake in lotus cultivar 'Zhongguo Hong Beijing'. Environ Sci Pollut Res 29, 62272–62280 (2022). https://doi.org/10.1007/s11356-022-19996-0

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  • DOI: https://doi.org/10.1007/s11356-022-19996-0

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