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Pseudomonas syringae pv. tomato exploits light signals to optimize virulence and colonization of leaves.
- Source :
-
Environmental microbiology [Environ Microbiol] 2018 Dec; Vol. 20 (12), pp. 4261-4280. Date of Electronic Publication: 2018 Aug 16. - Publication Year :
- 2018
-
Abstract
- Light is pervasive in the leaf environment, creating opportunities for both plants and pathogens to cue into light as a signal to regulate plant-microbe interactions. Light enhances plant defences and regulates opening of stomata, an entry point for foliar bacterial pathogens such as Pseudomonas syringae pv. tomato DC3000 (PsPto). The effect of light perception on gene expression and virulence was investigated in PsPto. Light induced genetic reprogramming in PsPto that entailed significant changes in stress tolerance and virulence. Blue light-mediated up-regulation of type three secretion system genes and red light-mediated down-regulation of coronatine biosynthesis genes. Cells exposed to white light, blue light or darkness before inoculation were more virulent when inoculated at dawn than dusk probably due to an enhanced entry through open stomata. Exposure to red light repressed coronatine biosynthesis genes which could lead to a reduced stomatal re-opening and PsPto entry. Photoreceptor were required for the greater virulence of light-treated and dark-treated PsPto inoculated at dawn as compared to dusk, indicating that these proteins sense the absence of light and contribute to priming of virulence in the dark. These results support a model in which PsPto exploits light changes to maximize survival, entry and virulence on plants.<br /> (© 2018 Society for Applied Microbiology and John Wiley & Sons Ltd.)
- Subjects :
- Amino Acids genetics
Amino Acids metabolism
Bacterial Proteins metabolism
Indenes metabolism
Plant Diseases microbiology
Pseudomonas syringae genetics
Pseudomonas syringae pathogenicity
Sigma Factor metabolism
Transcriptional Activation
Type III Secretion Systems genetics
Virulence genetics
Gene Expression Regulation, Bacterial radiation effects
Solanum lycopersicum microbiology
Plant Leaves microbiology
Pseudomonas syringae physiology
Pseudomonas syringae radiation effects
Subjects
Details
- Language :
- English
- ISSN :
- 1462-2920
- Volume :
- 20
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Environmental microbiology
- Publication Type :
- Academic Journal
- Accession number :
- 30058114
- Full Text :
- https://doi.org/10.1111/1462-2920.14331