pseudomonas brassicacearum pseudomonas brassicacearum pseudomonas brassicacearum is a gram-negative soil bacterium that infects the roots of brassica napus, from which it derives its name. based on 16s rrna analysis, p. brassicacearum falls within the p. fluorescens group. it has also been shown to have both pathogenic and plant growth-promoting effects on tomato plants. pseudomonas brassicacearum scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: pseudomonadaceae genus: pseudomonas species: p. brassicacearum binomial name pseudomonas brassicacearumachouak, et al. 2000 type strain cfbp 5593 cip 107059 dsm 13227 jcm 11938