Query: NC_005773:866157 Pseudomonas syringae pv. phaseolicola 1448A, complete genome Lineage: Pseudomonas savastanoi; Pseudomonas; Pseudomonadaceae; Pseudomonadales; Proteobacteria; Bacteria General Information: This is gram-negative bacterium pathogenic in plants. Characterized as causing halo blight on beans (Phaseolus vulgaris). This bacterium is closely related to Pseudomonas syringae pv. glycinea and Pseudomonas syringae pv. savastanoi and produces phaseolotoxin, which is a phytotoxin. Strain 1448A is a natural occurring rifampicin-resistant mutant strain and contains a non-functional homolog of avrPphE.
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General Information: This biovar nodulates legumes in the Tribe Viciae (Vicia, Pisum, Lathyrus, Lens). This strain is a spontaneous streptomycin-resistant mutant of strain 300. Nitrogen-fixing plant symbiont. This organism, like other Rhizobia, establishes a symbiotic relationship with a legume plant, providing nitrogen in exchange for a protected environment. The legume roots secrete flavonoids and isoflavonoids which the bacteria recognize and use to turn on genes involved in root nodulation. Many of the root nodulation genes are involved in synthesis and secretion of a nodule inducing signal, a lipochito-oligosaccharide molecule, which the plant recognizes, triggering nodule formation. The bacterium is endocytosed and exists inside a membrane bound organelle, the symbiosome, and fixes nitrogen for the plant cell while the host cell provides carbon compounds for the bacterium to grow on. The nitrogen fixation is important as it obviates the need for expensive and environmentally damaging fertilizer use.