Characterization of Clavibacter michiganensis subsp. michiganensis strains from recent outbreaks of bacterial wilt and canker in Serbia

Milijasevic-Marcic S, Gartemann K-H, Frohwitter J, Eichenlaub R, Todorovic B, Rekanovic E, Potocnik I (2012)
European Journal Of Plant Pathology 134(4): 697-711.

Journal Article | Published | English

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Abstract
Sixty-eight Clavibacter michiganensis subsp. michiganensis (Cmm) strains from recent outbreaks of bacterial wilt and canker in Serbia were collected from several tomato growing regions during a three-year period. The pathogen was identified based on bacteriological characteristics and pathogenicity tests and the identity of strains was confirmed by DAS ELISA and PCR amplification using primers CMM5/6 and PSA4/R. The strains showed homogeneity in biochemical and physiological properties. However, pathogenicity tests revealed differences in virulence that are presumably due to a loss of the pat-1 gene. Further strain characterization using DNA-based methods revealed a high diversity of the Serbian Cmm strains. Based on multi-locus sequence typing (MLST) analyses of five genes, Cmm strains were divided into seven groups. The pulsed-field gel electrophoresis (PFGE) pattern of a selection of strains supported the groupings based on trees of the kdpA/sdhA sequences. On the other hand, groupings made according to PFGE and MLST were not correlated to plasmid content in all cases. This study suggested that high genetic variability of the Serbian Cmm strains was detected both in MLST and PFGE analyses, and could have resulted either from new Cmm strains being introduced by seeds from different origins or as a consequence of an intraspecific hybridization process. In addition, this study proposed MLST as an efficient tool in epidemiological studies, population biology investigations and tracking the routes of transmission of pathogens. Four of the five house-keeping genes (kdpA, sdhA, ligA and gyrB) selected to characterize Cmm strains proved to be suitable for the MLST analysis. This is the first study carried out on the characterization of Cmm using MLST.
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Milijasevic-Marcic S, Gartemann K-H, Frohwitter J, et al. Characterization of Clavibacter michiganensis subsp. michiganensis strains from recent outbreaks of bacterial wilt and canker in Serbia. European Journal Of Plant Pathology. 2012;134(4):697-711.
Milijasevic-Marcic, S., Gartemann, K. - H., Frohwitter, J., Eichenlaub, R., Todorovic, B., Rekanovic, E., & Potocnik, I. (2012). Characterization of Clavibacter michiganensis subsp. michiganensis strains from recent outbreaks of bacterial wilt and canker in Serbia. European Journal Of Plant Pathology, 134(4), 697-711.
Milijasevic-Marcic, S., Gartemann, K. - H., Frohwitter, J., Eichenlaub, R., Todorovic, B., Rekanovic, E., and Potocnik, I. (2012). Characterization of Clavibacter michiganensis subsp. michiganensis strains from recent outbreaks of bacterial wilt and canker in Serbia. European Journal Of Plant Pathology 134, 697-711.
Milijasevic-Marcic, S., et al., 2012. Characterization of Clavibacter michiganensis subsp. michiganensis strains from recent outbreaks of bacterial wilt and canker in Serbia. European Journal Of Plant Pathology, 134(4), p 697-711.
S. Milijasevic-Marcic, et al., “Characterization of Clavibacter michiganensis subsp. michiganensis strains from recent outbreaks of bacterial wilt and canker in Serbia”, European Journal Of Plant Pathology, vol. 134, 2012, pp. 697-711.
Milijasevic-Marcic, S., Gartemann, K.-H., Frohwitter, J., Eichenlaub, R., Todorovic, B., Rekanovic, E., Potocnik, I.: Characterization of Clavibacter michiganensis subsp. michiganensis strains from recent outbreaks of bacterial wilt and canker in Serbia. European Journal Of Plant Pathology. 134, 697-711 (2012).
Milijasevic-Marcic, Svetlana, Gartemann, Karl-Heinz, Frohwitter, Jonas, Eichenlaub, Rudolf, Todorovic, Biljana, Rekanovic, Emil, and Potocnik, Ivana. “Characterization of Clavibacter michiganensis subsp. michiganensis strains from recent outbreaks of bacterial wilt and canker in Serbia”. European Journal Of Plant Pathology 134.4 (2012): 697-711.
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