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Phylogenetic Analysis Of Microbial Diversity In The Rhizoplane Of Oilseed Rape (Brassica Napus Cv. Westar) Employing Cultivation-Dependent And Cultivation-Independent Approaches

Olaf Kaiser, Alfred Pühler, Werner Selbitschka
Published 2001 · Biology, Medicine
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The structure of the microbial rhizoplane community of the important crop plant oilseed rape was studied by using a culture-dependent as well as a culture-independent approach based on 16S rDNA amplification. After isolation of the microbial community from the rhizoplane of oilseed rape (Brassica napus cv. Westar), the collected suspension was divided into two parts. One part was used for cultivation of bacteria onto three different growth media to establish a culture collection. From the other part of the rhizoplane suspension, genomic DNA was isolated and purified. Thereafter, 16S rDNA was amplified by PCR and cloned to obtain a library of 16S rDNA genes representative for the bacterial communities of this habitat. Phylogenetic 16S rDNA sequence analysis of 103 clones of this library revealed considerable differences from the corresponding nucleotide sequences of 111 cultured bacteria. Whereas the 16S rDNA clone library was dominated by a-Proteobacteria and bacteria of the Cytophaga-Flavobacterium-Bacteroides (CFB) phylum (51% and 30%, respectively), less than 17% of the cultured bacteria belonged to these two groups. More than 64% of the cultivated isolates were allocated to the b- and g-subclasses of the Proteobacteria, which were present in the clone library at about 14%. Most of the clones of the a-Proteobacteria of the library showed highest similarity to Bradyrhizobium sp. No such bacteria were found in the culture collection. Similarly, the second dominant group of the clone library comprising members of the CFB phylum was represented in the culture collection by a single isolate. The phylogenetic analysis of isolates of the culture collection clearly emphasized the need to use different growth media for recovery of rhizoplane bacteria. Whereas most of the a-Proteobacteria were recovered on complex medium, most of the b-Proteobacteria were isolated onto minimal media. Our results demonstrate that the combined approach pursued in this paper is necessary to explore the biodiversity of bacterial rhizoplane communities.
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