pseudomonas marginalis pseudomonas marginalis pseudomonas marginalis is a soil bacterium that can cause soft rots of plant tissues. it infects poinsettia, lettuce, and crucifers (canola, mustard). pseudomonas marginalis chicory infected with pseudomonas marginalis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: pseudomonadaceae genus: pseudomonas species: p. marginalis binomial name pseudomonas marginalis(brown 1918) stevens 1925 type strain atcc 10844 cfbp 1387 cip 106712 dsm 13124 icmp 3553 lmg 2215 ncppb 667 pathovars p. m. pv. alfalfae p. m. pv. marginalis p. m. pv. pastinacae synonyms bacterium marginale brown 1918 based on 16s rrna analysis, p. marginalis has been placed in the p. fluorescens group.