Abstract
Rapid development of gene sequencing technologies has led to an exponential increase in microbial sequencing data. Genome research of a single organism does not capture the changes in the characteristics of genetic information within a species. Pan-genome analysis gives us a broader perspective to study the complete genetic information of a species. Paenibacillus polymyxa is a Gram-positive bacterium and an important plant growth-promoting rhizobacterium with the ability to produce multiple antibiotics, such as fusaricidin, lantibiotic, paenilan, and polymyxin. Our study explores the pan-genome of 14 representative P. polymyxa strains isolated from around the world. Heap’s law model and curve fitting confirmed an open pan-genome of P. polymyxa. The phylogenetic and collinearity analyses reflected that the evolutionary classification of P. polymyxa strains are not associated with geographical area and ecological niches. Few genes related to phytohormone synthesis and phosphate solubilization were conserved; however, the nif cluster gene associated with nitrogen fixation exists only in some strains. This finding is indicative of nitrogen fixing ability is not stable in P. polymyxa. Analysis of antibiotic gene clusters in P. polymyxa revealed the presence of these genes in both core and accessory genomes. This observation indicates that the difference in living environment led to loss of ability to synthesize antibiotics in some strains. The current pan-genomic analysis of P. polymyxa will help us understand the mechanisms of biological control and plant growth promotion. It will also promote the use of P. polymyxa in agriculture.
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This work was jointly supported by the Key R & D projects (No. 20181BBF6003) of Jiangxi Provincial Science and Technology Department, and the Grant (No. 31760547) from the National Natural Science Foundation of China.
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LLZ: designed the experiments, analyzed the data, and wrote the manuscript. TZ, ST, XQF, SJY: manuscript revision. All authors read and approved the final manuscript.
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Zhou, L., Zhang, T., Tang, S. et al. Pan-genome analysis of Paenibacillus polymyxa strains reveals the mechanism of plant growth promotion and biocontrol. Antonie van Leeuwenhoek 113, 1539–1558 (2020). https://doi.org/10.1007/s10482-020-01461-y
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DOI: https://doi.org/10.1007/s10482-020-01461-y