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Enhanced production of antifungal lipopeptides by Bacillus amyloliquefaciens for biocontrol of postharvest disease.

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Title: Enhanced production of antifungal lipopeptides by Bacillus amyloliquefaciens for biocontrol of postharvest disease.
Authors: Pretorius, D.1, van Rooyen, J.1, Clarke, K.G.1 kclarke@sun.ac.za
Source: New Biotechnology. Mar2015, Vol. 32 Issue 2, p243-252. 10p.
Subjects: Antifungal agents, Peptide analysis, Bacillus amyloliquefaciens, Physiological control systems, Postharvest disease & injury prevention, Food security, Population biology
Abstract: Food security to sustain increasing populations is a global concern. A major factor threatening food security is crop spoilage during postharvest storage. Reduction of postharvest spoilage has mainly been addressed by the application of synthetic chemicals. Bacillus lipopeptides, specifically lipopeptide homologues exhibiting antifungal efficacy, offer an alternative environmentally benign protocol for reduction of postharvest phytopathogens. This work is directed towards Bacillus lipopeptide production for biocontrol of postharvest phytopathogens in general and fungal phytopathogens in particular. Bacillus amyloliquefaciens DSM 23117 was identified as an organism with superior potential for lipopeptide production, via screening of 4 Bacillus candidates, in terms of antifungal lipopeptide concentration, yield, productivity and preferred homologue ratio. Efficacy of B. amyloliquefaciens lipopeptides against Botrytis cinerea substantiated appropriateness of this Bacillus species. Subsequent process modification of B. amyloliquefaciens cultures demonstrated that the concentration and ratio of the lipopeptides were significantly influenced by process conditions and further, distinguished nitrate and oxygen availability as key parameters defining optimal lipopeptide production. Discrete B. amyloliquefaciens cultures supplied with 4, 8, 10 and 12 g/L NH 4 NO 3 demonstrated optimal lipopeptide concentration, yield and productivity, with respect to both total and antifungal lipopeptides, in the culture containing 8 g/L NH 4 NO 3 . Enhancement of total and antifungal lipopeptide kinetics similar to those quantified on increasing the nitrate from 4 to 8 g/L NH 4 NO 3 were exhibited in B. amyloliquefaciens cultures when the oxygen in the sparge gas was increased from 21 to 30 mol%. The enhancement of lipopeptide production under conditions of increased nitrate and increased oxygen supply is explained in terms of increased availability of nitrogen for synthesis. This work has highlighted key parameters for maximisation of Bacillus lipopeptide production and manipulation of antifungal/surfactin ratios for optimum efficacy and informs on future development of process strategies towards production optimisation of antifungal lipopeptides as a green alternative to synthetic chemicals. [ABSTRACT FROM AUTHOR]
Copyright of New Biotechnology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Enhanced production of antifungal lipopeptides by Bacillus amyloliquefaciens for biocontrol of postharvest disease.
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  Data: <searchLink fieldCode="JN" term="%22New+Biotechnology%22">New Biotechnology</searchLink>. Mar2015, Vol. 32 Issue 2, p243-252. 10p.
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  Data: Food security to sustain increasing populations is a global concern. A major factor threatening food security is crop spoilage during postharvest storage. Reduction of postharvest spoilage has mainly been addressed by the application of synthetic chemicals. Bacillus lipopeptides, specifically lipopeptide homologues exhibiting antifungal efficacy, offer an alternative environmentally benign protocol for reduction of postharvest phytopathogens. This work is directed towards Bacillus lipopeptide production for biocontrol of postharvest phytopathogens in general and fungal phytopathogens in particular. Bacillus amyloliquefaciens DSM 23117 was identified as an organism with superior potential for lipopeptide production, via screening of 4 Bacillus candidates, in terms of antifungal lipopeptide concentration, yield, productivity and preferred homologue ratio. Efficacy of B. amyloliquefaciens lipopeptides against Botrytis cinerea substantiated appropriateness of this Bacillus species. Subsequent process modification of B. amyloliquefaciens cultures demonstrated that the concentration and ratio of the lipopeptides were significantly influenced by process conditions and further, distinguished nitrate and oxygen availability as key parameters defining optimal lipopeptide production. Discrete B. amyloliquefaciens cultures supplied with 4, 8, 10 and 12 g/L NH 4 NO 3 demonstrated optimal lipopeptide concentration, yield and productivity, with respect to both total and antifungal lipopeptides, in the culture containing 8 g/L NH 4 NO 3 . Enhancement of total and antifungal lipopeptide kinetics similar to those quantified on increasing the nitrate from 4 to 8 g/L NH 4 NO 3 were exhibited in B. amyloliquefaciens cultures when the oxygen in the sparge gas was increased from 21 to 30 mol%. The enhancement of lipopeptide production under conditions of increased nitrate and increased oxygen supply is explained in terms of increased availability of nitrogen for synthesis. This work has highlighted key parameters for maximisation of Bacillus lipopeptide production and manipulation of antifungal/surfactin ratios for optimum efficacy and informs on future development of process strategies towards production optimisation of antifungal lipopeptides as a green alternative to synthetic chemicals. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of New Biotechnology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.nbt.2014.12.003
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        Text: English
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        Type: general
      – SubjectFull: Peptide analysis
        Type: general
      – SubjectFull: Bacillus amyloliquefaciens
        Type: general
      – SubjectFull: Physiological control systems
        Type: general
      – SubjectFull: Postharvest disease & injury prevention
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      – SubjectFull: Food security
        Type: general
      – SubjectFull: Population biology
        Type: general
    Titles:
      – TitleFull: Enhanced production of antifungal lipopeptides by Bacillus amyloliquefaciens for biocontrol of postharvest disease.
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            NameFull: Pretorius, D.
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              Text: Mar2015
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