azoarcus indigens azoarcus indigens azoarcus indigens is a species of bacteria. it is a nitrogen-fixing bacteria associated with roots of leptochloa fusca . its cells are yellow-pigmented, straight to curved, gram-negative rods. its type strain is vb32 (= lmg 9092). azoarcus indigens scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: rhodocyclales family: rhodocyclaceae genus: azoarcus species: azoarcus indigensreinhold-hurek et al., 1993