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Application of matrix-assisted laser desorption ionization time-of-flight mass spectrometry for rapid and accurate identification of Ralstonia solanacearum and Ralstonia pseudosolanacearum

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Abstract

Ralstonia solanacearum “species complex” (RSSC) represents soil-borne plant pathogenic bacteria, consisting of diverse and widespread strains that cause bacterial wilt on a wide range of host plants. A recent polyphasic taxonomic study has divided the RSSC into three bacterial species; Ralstonia pseudosolanacearum (phylotypes I and III), Ralstonia solanacearum (phylotype II) and Ralstonia syzygii (phylotype IV). Currently, standard identification of RSSC in plant health laboratories mainly relies on performance of two tests that are based on a different principle. However, these tests are inadequate to precisely discriminate among the three bacterial species in the RSSC. The accurate identification of each of the three bacterial species in the RSSC requires additional molecular tests, including a phylotype determination. These methodologies are labor-intensive, time consuming and rather impractical for routine identification purposes in a plant health laboratory. We explored the potential for an accurate identification of R. pseudosolanacearum (phylotypes I and III) and R. solanacearum (phylotype II) in RSSC, upon implementation of the MALDI-TOF MS tool, and after the creation and validation of an in-house database supplementing the commercial database and covering the entire known genetic diversity in RSSC. MALDI-TOF MS is an emerging approach for identification of bacterial plant pathogens and has been shown to be robust and reproducible. Additionally, when compared to the conventional microbial identification methods it is shown to be less laborious and less expensive. Validation data demonstrated that our in-house database (Mass Spectra Profiles, MSPs) was very specific resulting in the rapid and accurate identification of Ralstonia solanacearum (phylotype II), and Ralstonia pseudosolanacearum (phylotypes I and III). Additionally, no false positive results were obtained with our in-house database for other related Ralstonia sp., such as the R. picketii isolate PD 3286, or for the Pseudomonas syringae and Pseudomonas spp. isolates.

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Acknowledgements

This work was partly financially supported by research grant OS 2016339 project for R. solanacearum species complex of the Ministry of Economic Affairs in the Netherlands.

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  1. National Reference Centre (NRC), Dutch National Plant Protection Organization (NPPO-NL), P.O. Box. 9102, 6700, HC, Wageningen, the Netherlands

    J. L. J. van de Bilt, M. H. L. Wolsink, P. P. M. A. Gorkink-Smits, N. M. Landman & M. Bergsma-Vlami

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  1. J. L. J. van de Bilt
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  2. M. H. L. Wolsink
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  3. P. P. M. A. Gorkink-Smits
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  4. N. M. Landman
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Correspondence to M. Bergsma-Vlami.

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van de Bilt, J.L.J., Wolsink, M.H.L., Gorkink-Smits, P.P.M.A. et al. Application of matrix-assisted laser desorption ionization time-of-flight mass spectrometry for rapid and accurate identification of Ralstonia solanacearum and Ralstonia pseudosolanacearum. Eur J Plant Pathol 152, 921–931 (2018). https://doi.org/10.1007/s10658-018-1517-5

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