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Enhanced biosynthesis of phenazine-1-carboxamide by Pseudomonas chlororaphis strains using statistical experimental designs

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Abstract

Phenazine-1-carboxamide (PCN) is one of the major biocontrol agents produced by plant growth-promoting rhizosphere (PGPR) pseudomonads including Pseudomonas chlororaphis. In this study, a combined strategy of genetic modification and statistical experimental designs was applied to obtain mutants of P. chlororaphis strains with high-yield PCN production. To achieve this, the lon gene was knocked out in wild-type P. chlororaphis HT66 and the breeding mutant P3 strain with a non-scar deletion strategy. The resulting HT66Δlon and P3Δlon mutants produced a significantly higher PCN production in shake-flask cultures which was 5- and  9-folds greater than their native counterparts. The potential ability of strain P3Δlon for PCN production was further optimized by statistical designs. A two-level Plackett–Burman (PB) experimental design with six variables was employed to scrutinize medium components that significantly influence PCN production. Notably, glycerol, tryptone, and soy peptone were identified to be the most significant factors (p < 0.05). Response surface methodology (RSM) based on the central composite design (CCD) was adopted to determine these factors optimal levels and their interactive effects between culture components for PCN production. The predicted maximum PCN production was 9002 mg/L, whereas an actual PCN production of 9174 mg/L was recorded in the validation experiments using the optimal medium containing glycerol 37.08 mL/L, tryptone 20.00 g/L, and soy peptone 25.03 g/L, which was nearly threefolds higher than without optimization and 20-folds higher than the wild-type strain. In conclusion, the results revealed that P. chlororaphis display a high potential for industrial-scale production for phenazine biopesticides.

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Acknowledgements

This work was supported by the National Key Basic Research Program of China (No. 2012CB721005), the National Natural Science Foundation of China (No. 31270084), and the National High Technology Research and Development Program of China (No. 2012AA022107).

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Authors and Affiliations

  1. State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China

    Huasong Peng, Jian Tan, Wei Wang, Hongbo Hu & Xuehong Zhang

  2. School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian, 223003, China

    Muhammad Bilal

  3. National Experimental Teaching Center for Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China

    Hongbo Hu

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  1. Huasong Peng
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  2. Jian Tan
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  3. Muhammad Bilal
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  4. Wei Wang
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  5. Hongbo Hu
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  6. Xuehong Zhang
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Correspondence to Huasong Peng.

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Peng, H., Tan, J., Bilal, M. et al. Enhanced biosynthesis of phenazine-1-carboxamide by Pseudomonas chlororaphis strains using statistical experimental designs. World J Microbiol Biotechnol 34, 129 (2018). https://doi.org/10.1007/s11274-018-2501-0

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