Abstract
Plants can stimulate the microbes to degrade ubiquitous petroleum hydrocarbons (PHCs), which has prompted a novel view on rhizoremediation. In the present study, the degradation rate of PHCs was investigated and 16S rRNA gene analysis was performed to investigate the PHC-degrading bacteria in petroleum-contaminated soil with different plants. Mirabilis jalapa (M. jalapa) has a higher PHC degradation rate than Lolium perenne (L. perenne) under petroleum contamination. The bacterial diversity in rhizospheric soil was decreased but the relative abundance of Actinobacteriota, Proteobacteria, and Candidatus Saccharibacteria were significant increased on 45 days petroleum-contaminated rhizospheric soil. In addition, the relative expression of PHC degradation–related genes, the content of malic acid and citric acid of the root exudates in the two plants was significantly increased in response to petroleum stress. The content of citric acid increased 11.9 times in M. jalapa and 3.4 times in L. perenne, respectively, in response to petroleum stress. These results indicate that M. jalapa changes the hydrocarbon-degrading microbial community to enhance the degradation of PHCs by root exudates and phytostimulation.
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This research was supported by the National Natural Science Foundation of China (Grant No. 31070448).
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M.Z.: conceptualization; writing—original draft; supervision; resources. C.Y. and L.S.: investigation, data curation, methodology. Z.S. and J.X.: investigation, visualization, software. J.Z., Q.L., and Y.H.: methodology, software, validation. H.M., H.C., and J.C.: methodology, writing—review and editing. S.C.: conceptualization, data curation, software, writing—review and editing.
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Zhong, M., Yang, C., Su, L. et al. Interactions between plants and bacterial communities for phytoremediation of petroleum-contaminated soil. Environ Sci Pollut Res 31, 37564–37573 (2024). https://doi.org/10.1007/s11356-024-33667-2
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DOI: https://doi.org/10.1007/s11356-024-33667-2