Pseudomonas brassicacearum sp nov and Pseudomonas thivervalensis sp nov., two root-associated bacteria isolated from Brassica napus and Arabidopsis thaliana

Bacteria isolates phenotypically related to Pseudomonas corrugata have freq uently been isolated from the rhizosphere of Arabidopsis thaliana and Brass ica napus grown on different soils. 165 rDNA (rrs) gene sequencing, DNA-DNA hybridization, biochemical characterization and siderophore typing showed that these isolates belong to two different species that are distinct from other species of the genus Pseudomonas, including P. corrugata. A descripti on of properties of these two new species is given based on the study of 16 isolates. Proposed names are Pseudomonas brassicacearum (10 strains studie d) and Pseudomonas thivervalensis (6 strains studied). The type strain of P seudomonas brassicacearum is CFBP 11706(T) and that of Pseudomonas thiverva lensis is CFBP 11261(T).