pseudomonas aurantiaca pseudomonas aurantiaca pseudomonas aurantiaca is an orange gram-negative soil bacterium, originally isolated from the rhizosphere soil of potatoes. it produces di-2,4-diacetylfluoroglucylmethan, which is antibiotically active against gram-positive organisms. it has shown potential for use as a biocontrol agent against plant-pathogenic microbes. based on 16s rrna analysis, p. aurantiaca has been placed in the p. chlororaphis group. pseudomonas aurantiaca scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: pseudomonadaceae genus: pseudomonas species: p. aurantiaca binomial name pseudomonas aurantiacanachimovskaya 1948 type strain atcc 33663 cip 106718 ncimb 10068 vkm b-876 isolates found in ukraine living in root symbiosis produce 2,4-diacetylphloroglucinol to control fusarium oxysporum.