Abstract
The co-culture of cyanobacteria and heterotrophic bacteria can utilize the advantages of both bacteria, effectively remove pollutants and relieve the feedback inhibition effect in algae culture; however, little information is available in heavy metal removal. In this study, a filamentous cyanobacterium, Leptolyngbya sp. XZ1, isolated from biological soil crusts and four heterotrophic bacterial strains, namely, Y3, Y4, S1 and T2, isolated from the phycosphere were co-inoculated into BG-11 media containing Cd. Amongst co-culture systems, Leptolyngbya + S1 showed the highest Cd removal efficiencies of 93.2%, 71.8%, 60.7%, 56.8% and 41.0% at initial Cd concentrations of 2, 5, 10, 20 and 50 mg L−1, respectively. In this co-culture system, Cd adsorbed on the cell wall was increased by 42.8%, 52.9%, 50.0% and 22.6%, and the intracellular Cd was decreased by 37.9%, 37.0%, 51.0% and 50.6% at initial Cd concentrations of 5, 10, 20 and 50 mg L−1, respectively, compared with the Leptolyngbya monoculture. Under Cd stress, the biomass, extracellular polymeric substances (EPS)-polysaccharides and photosystem II activity of Leptolyngbya sp. XZ1 were increased by co-culture with Bacillus sp. S1. In addition, the Cd stress on Leptolyngbya was alleviated by co-culture with S1 as proven by the superoxide dismutase (SOD) activity, malondialdehyde (MDA) content, scanning electron microscopy (SEM) images, soluble protein content and SDS-PAGE analysis. Results indicated that the cyanobacteria-heterotrophic bacteria co-culture system can be used as an effective bioremediation method to remove heavy metals from aqueous solution.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This work was supported by the Open Project of Key Laboratory for Green Chemical Process of Ministry of Education (GCP202110) and the NSFC (31870432).
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This work was funded by the Open Project of Key Laboratory for Green Chemical Process of Ministry of Education (GCP202110) and the National Natural Science Foundation of China (31870432).
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Conceptualization: Lanzhou Chen, Changho Ri; Methodology: Changho Ri, Yue Tao, Xinyue Li, Sijia She; Analysis and interpretation of the data: Jiawei Tu, Lianghui Hou, Yaojia Fu; Writing – original draft: Changho Ri, Jiawei Tu; Writing – review & editing: Lanzhou Chen, Yue Tao; Project administration and supervision: Lanzhou Chen
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Ri, C., Tao, Y., Tu, J. et al. Improvement of the Cd removal efficiency of a filamentous cyanobacterium Leptolyngbya sp. XZ1 through co-culture with Bacillus sp. S1. J Appl Phycol 35, 2935–2944 (2023). https://doi.org/10.1007/s10811-023-03078-w
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DOI: https://doi.org/10.1007/s10811-023-03078-w