The complete genome of the antifungal bacterium Pseudomonas sp. strain MS82
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The genomic sequence of Pseudomonas sp. strain MS82 isolated from the rhizosphere of a soybean plant is reported and analyzed in relation to its extensive antifungal activity. Broth media used for production of the antifungal extract from strain MS82 against the mushroom pathogen Trichoderma viride were optimized using the routine plate bioassays. Culture extract of strain 82 in the peptone–K2HPO4–MgSO4 medium (PKM; peptone 20 g/L, K2HPO4 1.5 g/L, MgSO4 1.5 g/L and sterilized water) showed the best antifungal activity with an inhibition rate of 88.69 ± 3.87% to the fungal pathogen. Control efficacy of the T. viride contamination was investigated in mushroom production compost. The disease severity index of P. ostreatus hyphae infected by T. viride of treatment mixed with MS82 supernatant (38.33 ± 5.20%) was lower than that of the compost mixed with non-inoculated broth (97.50 ± 2.50%). The multilocus sequence analysis, containing four partial sequences from the gyrB, rpoB, recA and rpoD, suggests that strain MS82 is a Pseudomonas strain. The strain MS82 genome consists of a circular chromosome of 6,207,556 bp that was predicted to encode 5401 proteins and 131 RNA genes. Genome analysis revealed the presence of the gene clusters for biosynthesis of antifungal compounds, such as phenazine, pyocyanin, pyoverdine, volatile HCN and cyclic lipopeptides (arthrofactin). Genome analysis presented in the report will provide insights into development of biological control for fungal contamination in mushroom cultivation.
KeywordsPseudomonas sp. strain MS82 Complete genome Antifungal activity Mushroom cultivation Secondary metabolites
Nutrient broth yeast extract
Clusters of Orthologous Groups
Inferred from direct assay
Kyoto Encyclopedia of Genes and Genomes
Non-Redundant Protein database
Traceable author statement
This research was supported in part by Natural Science Foundation of Jiangsu Province for Youth (BK20150547 to ML) and China Agriculture Research System (CARS20 to ML). This research was funded in part by the USDA NIFA (Grant MIS-401170 to S-EL.).
LM and SL designed the experiments; SQ, JL, JJ, SB, NJ, HL and LH performed the experiments; LM and SL wrote the manuscript, and all authors read, critiqued and edited the manuscript.
Compliance with ethical standards
Conflict of interest
The authors declare no conflict of interest.
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