allochromatium phaeobacterium allochromatium phaeobacterium allochromatium phaeobacterium (a. phaeobacterium) is a phototrophic and rod-shaped purple sulfur bacterium from the genus of allochromatium which has been isolated from brackish water in bheemli, visakhapatnam, india. allochromatium phaeobacterium scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: chromatiales family: chromatiaceae genus: allochromatium species: a. phaeobacterium binomial name allochromatium phaeobacteriumsrinivas et al. 2009 type strain dsm 19781, jcm 14796, strain ja144 synonyms allochromatium sequicentenariumallochromatium sesquicentenarium a. phaeobacterium was first isolated from anoxic sediment in 2007, and isolated on a modified bielbl and pfennig medium. description a. phaeobacterium is a rod-shaped, gram-negative species of bacteria. this species appears brown in color, and is 1.0–1.5x2.0–4.0 μ m in length. a. phaeobacterium is motile and reproduces through binary fission. it has been observed growing photoautotrophically, photolithoautotrophically, photolithotrophically, and photoorganoheterotrophically. absoprtion spectra has confirmed photoreceptors bacteriochlorophyll α, rhodopinals, and carotenoids. genome a. phaeobacterium has been partially sequenced through 16s rrna gene sequencing with a sequence of approximately 1400 base pairs. the g/c content is 59.8%. based on phylogenetic analysis from this 16s sequence, allochromatium phaeobacterium is considered morphologically and physiologically distinct from others in the allochromatium genus.