Abstract
To investigate the effect of plant growth-promoting bacteria (PGPR) and arbuscular mycorrhizal fungi (AMF) on phytoremediation in saline-alkali soil contaminated by petroleum, saline-alkali soil samples were artificially mixed with different amount of oil, 5 and 10 g/kg, respectively. Pot experiments with oat plants (Avena sativa) were conducted under greenhouse condition for 60 days. Plant biomass, physiological parameters in leaves, soil enzymes, and degradation rate of total petroleum hydrocarbon were measured. The result demonstrated that petroleum inhibited the growth of the plant; however, inoculation with PGPR in combination with AMF resulted in an increase in dry weight and stem height compared with noninoculated controls. Petroleum stress increased the accumulation of malondialdehyde (MDA) and free proline and the activities of the antioxidant enzyme such as superoxide dismutase, catalase, and peroxidase. Application of PGPR and AMF augmented the activities of three enzymes compared to their respective uninoculated controls, but decreased the MDA and free proline contents, indicating that PGPR and AMF could make the plants more tolerant to harmful hydrocarbon contaminants. It also improved the soil quality by increasing the activities of soil enzyme such as urease, sucrase, and dehydrogenase. In addition, the degradation rate of total petroleum hydrocarbon during treatment with PGPR and AMF in moderately contaminated soil reached a maximum of 49.73 %. Therefore, we concluded the plants treated with a combination of PGPR and AMF had a high potential to contribute to remediation of saline-alkali soil contaminated with petroleum.
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Abbreviations
- PGPR:
-
Plant growth promoting bacteria
- AMF:
-
Arbuscular mycorrhizal fungi
- MDA:
-
Malondialdehyde
- TPH:
-
Total petroleum hydrocarbon
- SOD:
-
Superoxide dismutase
- CAT:
-
Catalase
- POD:
-
Peroxidase
- ROS:
-
Reactive oxygen species
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (31170479), Programs for Science and Technology Development of Heilongjiang Province, China (Grant No. GC12B304), Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Heilongjiang Province (2010TD10), and Harbin Normal University (KJTD2011-2).
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Responsible editor: Robert Duran
Feifei Xun and Baoming Xie contributed equally to this paper.
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Xun, F., Xie, B., Liu, S. et al. Effect of plant growth-promoting bacteria (PGPR) and arbuscular mycorrhizal fungi (AMF) inoculation on oats in saline-alkali soil contaminated by petroleum to enhance phytoremediation. Environ Sci Pollut Res 22, 598–608 (2015). https://doi.org/10.1007/s11356-014-3396-4
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DOI: https://doi.org/10.1007/s11356-014-3396-4