Abstract
Purpose
The present study aims to investigate the effects of plant growth-promoting rhizobacteria (PGPR) Enterobacter sp. Zm-123 and a heavy metal adsorption biomass spent mushroom substrate (SMS) on the growth promotion of rape and reduction of cadmium (Cd) toxicity in contaminated soil.
Materials and methods
The Zm-123 fermentation broth (Zm-123) and SMS were made into three kinds of solid microbial agents by spray-mixing granulation (SG), coating granulation (CG), and semi-solid fermentation (SSF), then Zm-123, SMS, and the three kinds of solid microbial agents were applied to the rapes growing in simulated Cd-contaminated soil pots, respectively.
Results and discussion
All treatment groups significantly recovered soil physical–chemical properties and decreased exchangeable Cd (SE-Cd) in the soil (P < 0.05). All five treatment groups significantly increased the biomass and chlorophyll content of rape compared with the CK group (P < 0.05). In addition, all treatments effectively increased the activities of antioxidant enzymes catalase (CAT) and peroxidase (POD), reduced the accumulation of proline and malondialdehyde (MDA), and reduced the Cd content of the edible parts of rape. Among the five treatment groups, the SSF group showed the strongest effect, reducing soil SE-Cd by 19.56–21.94% and the Cd content in the edible part by 30.53–49.06%.
Conclusions
SMS as the substrate of the semi-solid fermentation Zm-123 treatment group can effectively remediate soil Cd contamination and promote the growth of rape.
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This research was financially supported by the Natural Science Foundation of Heilongjiang Province, China (Grant No. LH2020D002).
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Jin, Y., Yang, R., Guan, Y. et al. Effects of Enterobacter sp. Zm-123 and spent mushroom substrate on rape growth promotion and cadmium toxicity reduction in cadmium-contaminated soil. J Soils Sediments 23, 2783–2797 (2023). https://doi.org/10.1007/s11368-023-03515-w
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DOI: https://doi.org/10.1007/s11368-023-03515-w