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Analysis of endophytic bacterial community composition by 16S rDNA clone library in Achnatherum inebrians

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Abstract

The endophytic bacterial diversity of drunken horse grass (DHG) (Achnatherum inebrians) growing in native habitat station in Xinjiang Province, China was analyzed by 16S rDNA cloning, amplified ribosomal DNA restriction analysis (ARDRA), and sequence homology comparison. To effectively exclude the interference of chloroplast DNA and mitochondrial DNA of DHG, a pair of bacterial PCR primers was selected to specifically amplify bacterial 16S rDNA sequences directly from DHG root tissues. Among 249 positive clones in the 16S rDNA library of endophytes, 57 OTUs were identified based on the similarity of the ARDRA banding profiles. Sequence analysis revealed diverse phyla of bacteria in the 16S rDNA library, which consisted of alpha, beta, gamma, delta, and epsilon subclasses of the Proteobacteria, Flavobacteria, Actinobacteria, Sphingobacteria, and uncultured bacteria. The dominant group was Proteobacteria, whie the most numerous genus was Bacillus. More than 8.00% of the total clones showed a high similarity to uncultured bacteria, suggesting that nonculturable bacteria make a significant part of DHG endophytic bacterial community. To our knowledge, this is the first report that endophytic bacteria associated with DHG are revealed by the culture-independent approach. The results suggest that the diversity of endophytic bacteria is abundant in DHG.

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  1. Institute of Microbiology, Xinjiang Academy of Agricultural Sciences, Urumqi, 830091, China

    Ying Wu Shi, Xuebing Zhang & Kai Lou

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  1. Ying Wu Shi
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  2. Xuebing Zhang
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  3. Kai Lou
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Correspondence to Kai Lou.

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Shi, Y.W., Zhang, X. & Lou, K. Analysis of endophytic bacterial community composition by 16S rDNA clone library in Achnatherum inebrians . Microbiology 83, 888–895 (2014). https://doi.org/10.1134/S0026261714060174

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  • DOI: https://doi.org/10.1134/S0026261714060174

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