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  • Title: Bacterial endophytes of the wildflower Crocus albiflorus analyzed by characterization of isolates and by a cultivation-independent approach.
    Author: Reiter B, Sessitsch A.
    Journal: Can J Microbiol; 2006 Feb; 52(2):140-9. PubMed ID: 16541150.
    Abstract:
    The presence and taxonomy of endophytic bacteria of the entire aerial parts of crocus (Crocus albiflorus), a wildflower native in the Alps, were investigated. A combination of plating of plant macerates, isolation and sequence identification of isolates, and direct 16S rDNA PCR amplification followed by whole-community fingerprinting (T-RFLP) and by construction of a bacterial clone library was used. The results clearly indicated that a wide range of bacteria from diverse phylogenetic affiliation, mainly gamma-Proteobacteria and Firmicutes, live in association with plants of C. albiflorus. The community composition of the culturable component of the microflora was remarkably different from that of the clone library. Only three bacterial divisions were found in the culture collection, which represented 17 phylotypes, whereas six divisions were identified in the clonal analysis comprising 38 phylotypes. The predominant group in the culture collection was the low G+C Gram-positive group, whereas in the clone library, the gamma-Proteobacteria predominated. Interestingly, the most prominent bacterium within the uncultured bacterial community was a pseudo monad closely related to a cold-tolerant Pseudomonas marginalis strain. The results suggest that Crocus supports a diverse bacterial microflora resembling the microbial communities that have been described for other plants and containing species that have not been described in association with plants.
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