Pseudomonas syringae is a rod shaped,
Gram-negative bacterium, with polar
flagella. It is a member of the
Pseudomonas genus, and based on 16S
rRNA analysis, P. syringae has been placed in the P. syringae group. It is a plant pathogen which can infect a wide range of plant species, and exists as over 50 different
pathovars. Many of these pathovars were once considered to be individual species within the Pseudomonas genus, but
molecular biology techniques such as
DNA hybridization have shown these to in fact all be part of the P. syringae species. It is named after the lilac tree (
Syringa vulgaris), from which it was first isolated.
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The genetically engineered strain of this bacteria lacks a cell-surface protein that helps ice crystals to form. Spraying these bacteria on crops may prevent freezing-related damages.
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