Azorhizobium caulinodans is a species of bacteria that forms a nitrogen-fixing symbiosis with plants of the genus Sesbania.

[2] The symbiotic relationship between Sesbania rostrata and A. caulinodans lead to nitrogen fixing nodules in S. rostrata.

Bacterial chemotaxis plays an important role in establishing this symbiotic relationship.

[3] Azorhizobium caulinodans is a genome and it contains chemotaxis gene clusters that are unique.

Azorhizobium caulinodans controls the movements of flagella, and the chemotaxis signaling path in Azorhizobium caulinodans helps with regulating biofilm formation.