Abstract
In this study, colonization and disease development of axenically-grown tomato plants by Clavibacter michiganensis subsp. michiganensis (Cmm), the causative agent of bacterial wilt and canker, was investigated. For this, a spontaneous rifampicin resistant strain of Cmm was tagged with a marker that expressed a green fluorescent protein (GFP) in a stable way and which possessed a similar virulence to the parental strain. In vitro plants were drop-inoculated at the stem base and the population dynamics was determined by dilution pour-plating in a selective medium. At 3 h after inoculation, Cmm was already present in low densities in roots, stems and leaves. At 16 dpi, Cmm was found throughout the entire plant in high densities of ca. 1010 cfu g−1. Symptoms developed in the in vitro plants typical for Cmm, such as canker, wilting and growth reduction. The presence of Cmm in vascular and parenchymatic tissue of in vitro tomato plants was confirmed by epifluorescence stereo- and confocal laser scanning microscopy. This study showed that in vitro tomato plants can be effectively used for detailed studies on interactions between Cmm and its host, in particular if a GFP-tagged strain of the pathogen is used.
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Acknowledgments
We thank Dr. R. Eichenlaub (Bielefeld, Germany) for providing the gfp-plasmid and P. Kastelein, P. S. van der Zouwen, M. C. Krijger, B.C.E. Kronenburg-van de Ven and G.J.M. de Klerk for technical help and advices. W. de Boer for help with the statistical analysis. The editorial work of Mrs. L.J. Hyman (Dundee, Scotland, UK) is highly appreciated. Thanks are also indebted to the Capes Foundation, Ministry of Education of Brazil for providing a student travel grant. The project was financed by the Dutch Ministry of Economic Affairs via the program “Plant Propagation Material” (BO-04).
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Figure S1
Symptoms of in vitro tomato plants at 6 days after drop-inoculation with Clavibacter michiganensis subsp. michiganensis using a concentration of 108 cfu ml-1. a Water-inoculated plant (negative control). b Plant inoculated with a GFP-tagged strain of IPO3356 (IPO3525) showing yellowing of leaves. c Plant drop-inoculated with wild type strain IPO3356 showing yellowing of leaves and blackening of the midrib. (DOC 1028 kb)
Figure S2
Stability test of the GFP-expression by the transformant in plants at 31 dpi. Whole plants were macerated and plated on media supplemented with rifampicin and cycloheximide. Colonies were visualized using an epifluorescence stereo microscope. Colonies partially fluorescent were counted as non-fluorescent for the stability test. (DOC 240 kb)
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Lelis, F.M.V., Czajkowski, R., de Souza, R.M. et al. Studies on the colonization of axenically grown tomato plants by a GFP-tagged strain of Clavibacter michiganensis subsp. michiganensis . Eur J Plant Pathol 139, 53–66 (2014). https://doi.org/10.1007/s10658-013-0362-9
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DOI: https://doi.org/10.1007/s10658-013-0362-9