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The effects of petroleum contaminated soils on the growth, gas exchange and antioxidative level of sea-buckthorn

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Abstract

Background and aims

Sea-buckthorn (Hippophae rhamnoides) is widely domesticated and cultivated in orchards worldwide. With the advantages of a large root system and the symbiosis of fibrous roots with Frankia, a group of N2 fixing bacteria which form nodules with the roots, sea-buckthorn can grow in harsh environment under extreme weather conditions. However, its tolerance to petroleum contamination in the soil has so far not been studied. To elucidate whether sea-buckthorn can be employed for phytoremediation of petroleum contamination, its remediation efficiency as well as its growth and metabolic traits in petroleum contaminated soil were examined in an experiment with potted plants.

Methods

Sea-buckthorn seedlings were planted in soils with four different petroleum concentrations from April to September in a pot experiment. The responses of growth, gas exchange and the antioxidative system were examined on three sampling dates. After 5.5-month of exposure, soil petroleum remediation was evaluated in planted and unplanted soils.

Results

The petroleum decontamination rate was significantly enhanced by H. rhamnoides in soils with petroleum contamination up to 15 g kg−1 after one growing season. The root to shoot ratio increased continuously with the increase of the petroleum concentration as a consequence of reduced biomass allocated to the shoots, probably as a mechanism to counteract stress by the petroleum contamination of the soil. Photosynthesis was enhanced by lower petroleum concentrations in the soil (≦15 g kg−1) in September. Short-term exposure (in July) to high petroleum concentrations (20 g kg−1) in the soil enhanced ascorbate peroxidase (APX), glutathione reductase (GR), superoxide dismutase (SOD), and catalase (CAT) activity and increased ascorbic acid (AsA) and glutathione (GSH) contents, indicating elevated activity of the Foyer-Haliwell-Asada-Cycle. However, similar effects were not observed at long-term exposure.

Conclusions

Our results prove that sea-buckthorn is a promising tool for phytoremediation of petroleum contaminated soils up to 15 g kg−1 in loess plateau soil in China.

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Acknowledgments

We gratefully acknowledge financial support of the present projects by the National Forestry Industry Research Special Funds for Public Welfare (No. 201104002-4) and the Fundamental Research Funds from Northwest A&F University (No. QN2011162).

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Authors and Affiliations

Authors

Contributions

Qiuxiao Duan: Data curation, Writing-original draft. Bixiao Cui: Experimental conductance, Data curation. Heinz Rennenberg: Writing-review & editing. Gang Han: Conceptualization, Supervision, Funding acquisition, Writing-review & editing.

Corresponding author

Correspondence to Gang Han.

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Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Responsible Editor: Enzo Lombi.

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Duan, Q., Han, G., Cui, B. et al. The effects of petroleum contaminated soils on the growth, gas exchange and antioxidative level of sea-buckthorn. Plant Soil 486, 535–550 (2023). https://doi.org/10.1007/s11104-023-05888-w

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  • DOI: https://doi.org/10.1007/s11104-023-05888-w

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