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Desiccation-induced cell damage in bacteria and the relevance for inoculant production

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Abstract

Plant growth–promoting bacteria show great potential for use in agriculture although efficient application remains challenging to achieve. Cells often lose viability during inoculant production and application, jeopardizing the efficacy of the inoculant. Since desiccation has been documented to be the primary stress factor affecting the decrease in survival, obtaining xerotolerance in plant growth–promoting bacteria is appealing. The molecular damage that occurs by drying bacteria has been broadly investigated, although a complete view is still lacking due to the complex nature of the process. Mechanic, structural, and metabolic changes that occur as a result of water depletion may potentially afflict lethal damage to membranes, DNA, and proteins. Bacteria respond to these harsh conditions by increasing production of exopolysaccharides, changing composition of the membrane, improving the stability of proteins, reducing oxidative stress, and repairing DNA damage. This review provides insight into the complex nature of desiccation stress in bacteria in order to facilitate strategic choices to improve survival and shelf life of newly developed inoculants.

Key Points

  • Desiccation-induced damage affects most major macromolecules in bacteria.

  • Most bacteria are not xerotolerant despite multiple endogenous adaption mechanisms.

  • Sensitivity to drying severely hampers inoculant quality.

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Funding

VG received a fellowship from the Flemish Agency for Innovation and Entrepreneurship (VLAIO). This work was supported by the grant IWT150711.

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VG performed the literature search and wrote the manuscript. The manuscript was critically revised by JM. All authors read and approved the manuscript.

Corresponding author

Correspondence to Jan Michiels.

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The authors declare that they have no conflict of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Greffe, V.R.G., Michiels, J. Desiccation-induced cell damage in bacteria and the relevance for inoculant production. Appl Microbiol Biotechnol 104, 3757–3770 (2020). https://doi.org/10.1007/s00253-020-10501-6

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  • DOI: https://doi.org/10.1007/s00253-020-10501-6

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