1887

Abstract

The whole-genome-sequenced rhizobacterium FZB42 (Chen , 2007) and other plant-associated strains of the genus described as belonging to the species or are used commercially to promote the growth and improve the health of crop plants. Previous investigations revealed that a group of strains represented a distinct ecotype related to ; however, the exact taxonomic position of this group remains elusive (Reva , 2004). In the present study, we demonstrated the ability of a group of strains closely related to strain FZB42 to colonize roots. On the basis of their phenotypic traits, the strains were similar to DSM 7 but differed considerably from this type strain in the DNA sequences of genes encoding 16S rRNA, gyrase subunit A () and histidine kinase (). Phylogenetic analysis performed with partial 16S rRNA, and gene sequences revealed that the plant-associated strains of the genus , including strain FZB42, formed a lineage, which could be distinguished from the cluster of strains closely related to DSM 7. DNA–DNA hybridizations (DDH) performed with genomic DNA from strains DSM 7 and FZB42 yielded relatedness values of 63.7–71.2 %. Several methods of genomic analysis, such as direct whole-genome comparison, digital DDH and microarray-based comparative genomichybridization (M-CGH) were used as complementary tests. The group of plant-associated strains could be distinguished from strain DSM 7 and the type strain of by differences in the potential to synthesize non-ribosomal lipopeptides and polyketides. Based on the differences found in the marker gene sequences and the whole genomes of these strains, we propose two novel subspecies, designated subsp. subsp. nov., with the type strain FZB42 ( = DSM 23117 = BGSC 10A6), and subsp. subsp. nov., with the type strain DSM 7( = ATCC 23350 = Fukumoto Strain F) for plant-associated and non-plant-associated representatives, respecitvely. This is in agreement with results of DDH and M-CGH tests and the MALDI-TOF MS of cellular components, all of which suggested that the ecovars represent two different subspecies.

Funding
This study was supported by the:
  • Genome Research on Bacteria
  • Chinese-German collaboration program by the German Ministry for Education and Research
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2011-08-01
2024-03-28
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