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Design and application of new 16S rRNA-targeted oligonucleotide probes for the Azospirillum-Skermanella-Rhodocista-cluster.

The genera Azospirillum, Skermanella and Rhodocista form a phylogenetic subgroup within the alfa subclass of Proteobacteria. Based on comparative 16S rRNA sequence analysis a nested set of new oligonucleotide probes was designed. It comprises probes for the whole genus cluster Azospirillum-Skermanella-Rhodocista, for the Azospirilli subcluster I including A. lipoferum, A. doebereinerae, A. largimobile, A. brasilense and A. halopraeferens, for the Azospirilli subcluster II including A. amazonense, A. irakense and the genus Skermanella, for the genus Rhodocista as well as for all Azospirilli species or species cluster. The new probes allow a fast and reliable in situ identification of bacteria belonging to the Azospirillum-Skermanella-Rhodocista-cluster at different phylogenetic levels. The specificity of the new probes was tested with 56 strains of the Azospirillum-Rhodocista-Skermanella-cluster and selected reference cells from other genera by hybridising with the complete probe set. In addition, applications of the fluorescently labelled probes for in situ identification of isolates and for the in situ localisation of A. brasilense on maize roots were demonstrated using confocal laser scanning microscopy.