Journal
ENVIRONMENTAL MICROBIOLOGY
Volume 16, Issue 7, Pages 2072-2085Publisher
WILEY
DOI: 10.1111/1462-2920.12240
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Funding
- Ministerio de Ciencia e Innovacion, Spain [AGL2009-12757]
- Ministerio de Economia y Competitividad, Spain [AGL2012-32516]
- 'Ramon y Cajal' program from the Ministerio de Ciencia e Innovacion, Spain [RYC-2007-01045]
- FPI program (Ministerio de Ciencia e Innovacion, Spain)
- Campus de Excelencia Internacional Andalucia Tech
- [AGL2011-30343-C02-01]
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Pseudomonas syringae pv tomato DC3000 (Pto) is the causal agent of the bacterial speck of tomato, which leads to significant economic losses in this crop. Pto inhabits the tomato phyllosphere, where the pathogen is highly exposed to light, among other environmental factors. Light represents a stressful condition and acts as a source of information associated with different plant defence levels. Here, we analysed the presence of both blue and red light photoreceptors in a group of Pseudomonas. In addition, we studied the effect of white, blue and red light on Pto features related to epiphytic fitness. While white and blue light inhibit motility, bacterial attachment to plant leaves is promoted. Moreover, these phenotypes are altered in a blue-light receptor mutant. These light-controlled changes during the epiphytic stage cause a reduction in virulence, highlighting the relevance of motility during the entry process to the plant apoplast. This study demonstrated the key role of light perception in the Pto phenotype switching and its effect on virulence.
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