Pseudomonas syringae
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Pseudomonas syringae
Pseudomonas syringae is a rod shaped, Gram-negative bacterium with polar flagella. A plant pathogen which can infect a wide range of plant species, and exists as over 50 different pathovars. It tests negative for arginine dihydrolase and oxidase activity, and forms the polymer levan on sucrose nutrient agar.
| Kingdom | Bacteria |
|---|---|
| Phylum | Proteobacteria |
| Class | Gamma Proteobacteria |
| Order | Pseudomonadales |
| Family | Pseudomonadaceae |
| Genus | Pseudomonas |
| Species | P. syringae |
| Binomial | Pseudomonas syringae |
[edit] Surface Characteristics
In cell wall O-polysaccharides of the LPS consists of tetra- and tri-α-D-rhamnose repeats in the backbone [-3)D-Rha(α1->3)D-Rha(α1-->2)D-Rha(α1->2)D-Rha(α1] and [3)D-Rha(α1-->3)D-Rha(α1-->2)D-Rha(α1-]
[edit] Pathogenic Activity
It is responsible for the surface frost damage in plants, exposed to the environment. P. syringae can cause water to freeze at temperatures as high as −1.8°C, but strains causing ice nucleation at lower temperatures (down to −8°C) are more common. The freezing causes injuries in the epithelia and makes the nutrients in the underlying plant tissues available to the bacteria.
