Plant Pathology (2014) 63, 1119-1129

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G. Sharabani, S. Manulis-Sasson, L. Chalupowicz, M. Borenstein, R. Shulhani, M. Lofthouse, M. Sofer, O. Frenkel, O. Dror and D. Shtienberg (2014)
Temperature at the early stages of Clavibacter michiganensis subsp. michiganensis infection affects bacterial canker development and virulence gene expression
Plant Pathology 63 (5), 1119-1129
Abstract: Clavibacter michiganensis subsp. michiganensis (Cmm), the causal agent of bacterial canker and wilt, causes severe economic losses in tomato net-houses and greenhouses worldwide. In this study, seedlings which were transplanted and inoculated monthly over 2 years wilted and died earlier in the spring (21–24°C) and autumn (18–23°C) than in the winter (15–18°C) and summer (28–31°C): T50 (the time taken for 50% of the plants to wilt or die) was 2 and 3–4 months after inoculation, respectively. A highly significant correlation was found between the average temperatures during the first month after inoculation and T50; the shortest T50 mortality (70 days) was observed for an average temperature of 26°C. Expression of virulence genes (pat-1, celA, chpC and ppaA) by Cmm was higher in plants inoculated in the spring than in those inoculated in the summer. In another set of experiments, seedlings were inoculated and maintained in controlled-environment growth chambers for 2 weeks. Subsequently, they were transplanted and maintained in commercial-type greenhouses for 4–5 months. The temperatures prevailing in the first 48 h after inoculation were found to affect Cmm population size and virulence gene expression and to have season-long effects on bacterial canker development.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): D. Shtienberg, Shulamit Manulis-Sasson

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Clavibacter michiganensis Tomato (Solanum lycopersicum)