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Identification, characterization, and genome sequencing of Brevibacterium sediminis MG-1 isolate with growth-promoting properties

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Abstract

In recent years, plant growth-promoting rhizobacteria (PGPR) have received increased attention due to their prospective use as biofertilizers for the enhancement of crop growth and yields. However, there is a growing need to identify new PGPR isolates with additional beneficial properties. In this paper, we describe the identification of a new strain of a non-sporulating Gram-positive bacterium isolated from the rhizosphere of potato plants, classified as Brevibacterium sediminis MG-1 based on whole-genome sequencing. The bacteria are aerobic; they grow in a pH range of 6.0–10.0 (optimum 6.0), and a temperature range of 20–37 °C (optimum 30 °C). At 96 h of cultivation, strain MG-1 synthesizes 28.65 µg/ml of indole-3-acetic acid (IAA) when 500 µg/ml of l-tryptophan is added. It is a producer of catechol-type siderophores and ACC deaminase (213 ± 12.34 ng/ml) and shows halotolerance. Treatment of pea, rye, and wheat seeds with a suspension of MG-1 strain cells resulted in the stimulation of stem and root biomass accumulation by 12–26% and 6–25% (P < 0.05), respectively. Treatment of seeds with bacteria in the presence of high salt concentration reduced the negative effects of salt stress on plant growth by 18–50%. The hypothetical gene lin, encoding the bacteriocin Linocin-M18, RIPP-like proteins, and polyketide synthase type III (T3PKS) loci, gene clusters responsible for iron acquisition and metabolism of siderophores, as well as gene clusters responsible for auxin biosynthesis, were identified in the B. sediminis MG-1 genome. Thus, the rhizosphere-associated strain B. sediminis MG-1 has growth-stimulating properties and can be useful for the treatment of plants grown on soils with high salinity.

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All datasets generated for this study have been included in the article/Supplementary Information.

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Funding

This study was supported by a grant from the Russian Science Foundation [project no. 22-16-00138] and the Kazan Federal University Strategic Academic Leadership Program (PRIORITY-2030).

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Contributions

MRS and AMM designed the research and supervised all research; MTL, GFL, DSP, and YAA carried out the experiments and analyzed the data and drafted the manuscript; MTL and GFL prepared the figures; MTL, GFL, and AMM wrote the manuscript; EIS, SGV, and AMM partook in the revision of the manuscript. All authors approved the final submitted manuscript.

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Correspondence to Marat Tafkilevich Lutfullin.

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The authors declare that there is no conflict of interests regarding the publication of this paper.

Supplementary Information

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13205_2022_3392_MOESM1_ESM.pdf

Supplementary file1 Phylogenetic tree showing the position of strain MG-1 relative to other strains of Brevibacterium spp. (GenBank accession numbers for all represented 16S rRNA sequences are available in Additional file 1). The phylogenetic tree is based on 16S rRNA gene alignments and was constructed with the MEGA X 10.1 software (PDF 69 KB)

13205_2022_3392_MOESM2_ESM.pdf

Supplementary file2 Heatmap depicting the pairwise comparison of Brevibacterium sp. MG-1 genome with the genomes of different Brevibacterium species (PDF 71 KB)

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Supplementary file3 The hypothetical bacteriocin gene Linocin-M18, identified using Bagel4 in the B. sediminis MG-1 genome (PNG 13 KB)

Supplementary file4 Prophage regions identified by PHASTER in the B. sediminis MG-1 genome (PNG 111 KB)

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Lutfullin, M.T., Lutfullina, G.F., Pudova, D.S. et al. Identification, characterization, and genome sequencing of Brevibacterium sediminis MG-1 isolate with growth-promoting properties. 3 Biotech 12, 326 (2022). https://doi.org/10.1007/s13205-022-03392-z

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  • DOI: https://doi.org/10.1007/s13205-022-03392-z

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