Abstract
Heavy metal accumulation in plants may imperil human health. Inoculation of plant growth-promoting bacteria can alleviate the toxicity of heavy metal and promote plant growth. In this study, Bacillus sp. YM-1, a heavy metal resistant and plant growth-promoting bacterium, was immobilized with spent substrate of mushroom and applied to alleviate the toxicity of Pb to pakchoi. The results indicated that the biomass of pakchoi in inoculation group was increased by 17.45 to 27.05% compared with that in non-inoculated group (p < 0.05). The root and shoot were lengthened by 13.45% to 39.17% and 20.23% to 42.36%, respectively. The content of Pb in root and shoot obviously reduced and that in edible part (shoot) was less than 0.2 mg kg−1 in the low concentration of Pb. Other indicators such as superoxide dismutase (SOD), peroxidase (POD), chlorophyll, and protein all testified that YM-1 inoculation was conducive to the alleviation of Pb toxicity to pakchoi.
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Acknowledgments
We are grateful to Dr. Juanjuan Qu for her careful guidance in this manuscript and acknowledge the anonymous referees for providing helpful suggestions
Funding
This study was financially supported by the Natural Science Foundation of Heilongjiang Province, CN (grant number D2016001).
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Yu, S., Liang, J., Bai, X. et al. Inoculation of plant growth-promoting bacteria Bacillus sp. YM-1 alleviates the toxicity of Pb to pakchoi. Environ Sci Pollut Res 25, 28216–28225 (2018). https://doi.org/10.1007/s11356-018-2802-8
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DOI: https://doi.org/10.1007/s11356-018-2802-8