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Diversity of endophytic bacteria in ginseng and their potential for plant growth promotion

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Abstract

Endophytic bacteria have been found in virtually every plant studied, where they colonize the internal tissues of their host plant and can form a range of different beneficial relationships. The diversity of bacterial endophytes associated with ginseng plants of varying age levels in Korea was investigated. Fifty-one colonies were isolated from the interior of ginseng stems. Although a mixed composition of endophyte communities was recovered from ginseng based on the results of 16S rDNA analysis, bacteria of the genus Bacillus and Staphylococcus dominated in 1-year-old and 4-year-old plants, respectively. Phylogenetic analysis revealed four clusters: Firmicutes, Actinobacteria, α-Proteobacteria, and γ-Proteobacteria, with Firmicutes being predominant. To evaluate the plant growth promoting activities, 18 representative isolates were selected. Amplification of nifH gene confirmed the presence of diazotrophy in only two isolates. Half of the isolates solubilized mineral phosphate. Except four, all the other endophytic isolates produced significant amounts of indole acetic acid in nutrient broth. Iron sequestering siderophore production was detected in seven isolates. Isolates E-I-3 (Bacillus megaterium), E-I-4 (Micrococcus luteus), E-I-8 (B. cereus), and E-I-20 (Lysinibacillus fusiformis) were positive for most of the plant growth promoting traits, indicating their role in growth promotion of ginseng.

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Authors and Affiliations

  1. Agricultural College & Research Institute, Tamil Nadu Agricultural University, Tiruchirappalli, 620 009, Tamil Nadu, India

    Regupathy Thamizh Vendan

  2. Department of Microbiology, Chungnam National University, Daejeon, 305-764, Republic of Korea

    Young Joon Yu, Sun Hee Lee & Young Ha Rhee

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  1. Regupathy Thamizh Vendan
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  2. Young Joon Yu
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  3. Sun Hee Lee
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  4. Young Ha Rhee
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Correspondence to Young Ha Rhee.

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Vendan, R.T., Yu, Y.J., Lee, S.H. et al. Diversity of endophytic bacteria in ginseng and their potential for plant growth promotion. J Microbiol. 48, 559–565 (2010). https://doi.org/10.1007/s12275-010-0082-1

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