Abstract
Bacterial predation is a vital feeding behavior that affects community structure and maintains biodiversity. However, predatory bacterial species in coastal sediments are comparatively poorly described. In this study, the predation capacity of all nine culturable Bradymonabacteria strains belonging to the recently discovered order Bradymonadales was determined against different types of prey. The predatory efficiency of Bradymonabacteria increased as the initial prey proportion in a mixed culture decreased. When the initial prey proportion was 0.5, the number of surviving prey bacterial cells significantly decreased after 4 h of predation with the Bradymonabacteria strains TMQ1, SEH01, B210 and FA350. However, growth of the prey strain occurred in the presence of the Bradymonabacteria strains TMQ4, TMQ2, TMQ3, V1718 and YN101. When the initial prey proportion decreased to 0.1 or 0.01, most of the Bradymonabacteria strains preyed efficiently. Furthermore, established neighboring colonies of prey were destroyed by Bradymonabacteria. This invading predation capacity was determined by the predation ability of the strain and its motility on the agar surface. Our findings provide new insights into the potential ecological significance of predatory Bradymonabacteria, which may serve as a potential probiotic for use in the aquaculture.
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The 16S rRNA gene sequences and bacterial genomes were acquired from the NCBI GenBank database.
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Funding
This work was supported by the National Natural Science Foundation of China (31900091, 31770002), Science & Technology Fundamental Resources Investigation Program (2022FY101100), and the State Key Laboratory of Microbial Technology Open Projects Fund (M2019-08).
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ZJD and YG designed experiments; YG, XYP, CHZ, SXW and YZ performed experiments; YG, MYW, DSM and ZJD analyzed data; YG and ZJD wrote the paper.
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Gong, Y., **, XY., Zeng, CH. et al. Predation capacity of Bradymonabacteria, a recently discovered group in the order Bradymonadales, isolated from marine sediments. Arch Microbiol 204, 695 (2022). https://doi.org/10.1007/s00203-022-03303-z
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DOI: https://doi.org/10.1007/s00203-022-03303-z