Query: NC_007794:2839239 Novosphingobium aromaticivorans DSM 12444, complete genome
Lineage: Novosphingobium aromaticivorans; Novosphingobium; Sphingomonadaceae; Sphingomonadales; Proteobacteria; Bacteria
General Information: This strain, also known as F199, was isolated from a sample obtained at a depth of 410 m from a borehole sample that was drilled at the Savannah River Site in South Carolina, USA. Aromatic hydrocarbon-degrading bacterium. This organism is unusual in that it has glycosphingolipid in the cell envelope instead of the lipopolysaccharide found in most other gram negative organisms. It is typically isolated from a wide range of environmental sites.
Subject: NC_008380:58232 Rhizobium leguminosarum bv. viciae 3841, complete genome
Lineage: Rhizobium leguminosarum; Rhizobium; Rhizobiaceae; Rhizobiales; Proteobacteria; Bacteria
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.