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Diversity and metabolic potential of culturable root-associated bacteria from Origanum vulgare in sub-Himalayan region

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Abstract

Study of rhizospheric bacteria from important plants is very essential, as they are known to influence plant growth and productivity, and also produce industrially important metabolites. Origanum vulgare is a perennial medicinal aromatic plant rich in phenolic antioxidants. Present study investigates the diversity of culturable root-associated bacteria from this plant in Palampur, India, which constitutes a unique ecosystem due to high rain fall, wide temperature fluctuations and acidic soil. Both root endophytes and rhizospheric soil bacteria were isolated, which resulted in a total of 120 morphologically different isolates. They were found to group into 21 phylotypes based on restriction fragment length polymorphism analysis. Growth medium composition had significant effect on the diversity of the isolated bacterial populations. The isolates were characterized for various metabolic, plant growth promoting (PGP) and other biotechnologically useful activities, based on which they were clustered into groups by principal component analysis. Majority of the isolates belonged to γ-Proteobacteria and Firmicutes. Pseudomonas and Stenotrophomonas were the most dominant species and together constituted 27.5 % of the total isolates. Many isolates, especially γ-Proteobacteria, showed very high PGP activities. Few isolates exhibited very high antioxidant activity, which may find potential applications in food and health industries. Firmicutes were catabolically the most versatile group and produced several hydrolytic enzymes. To the best of our knowledge, it is the first study describing rhizospheric microbial community of O. vulgare.

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Acknowledgments

The author is thankful to Director, NERRI, Nagpur, and Director, IHBT, Palampur, for providing necessary facilities to carry out the work.

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Authors and Affiliations

  1. Biotechnology Division, Institute of Himalayan Bioresource Technology (IHBT), Council of Scientific and Industrial Research (CSIR), Palampur, 176061, India

    Amit Bafana

  2. Environmental Health Division, National Environmental Engineering Research Institute (NEERI), Council of Scientific and Industrial Research (CSIR), Nagpur, 440020, India

    Amit Bafana

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Correspondence to Amit Bafana.

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Bafana, A. Diversity and metabolic potential of culturable root-associated bacteria from Origanum vulgare in sub-Himalayan region. World J Microbiol Biotechnol 29, 63–74 (2013). https://doi.org/10.1007/s11274-012-1158-3

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  • DOI: https://doi.org/10.1007/s11274-012-1158-3

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