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Growth promotion effects of the endophyte Acinetobacter johnsonii strain 3-1 on sugar beet

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Abstract

An endophytic bacteriumn identified as Acinetobacter johnsonii strain 3–1 was isolated from surface-sterilized roots of Beta vulgaris. Its effect on sugar beet seedling growth was studied using pot assays and field experiments. This strain promoted beet seedling growth following seed inoculation by seed dipping. Plant height and dry weight of beet increased by 19% and 69%, respectively, compared with controls. Strain 3–1 exhibited the ability to increase absorption of N, P, K, and Mg elements from soil and increase the content of vitamins B and C, and protein within beet. In addition, the strain also produced a phytohormone-auxin, produced nearly twice as much IAA as that produced by strain 2–2, and was able to solubilize phosphates. The concentration of dissolved P in the medium was 180.5 mg L−1 after 4 days of incubation. In field experiments, strain 3–1 significantly increased the content of sucrose, fructose, and the yield of the beet. The growth-promoting properties of Acinetobacter johnsonii strain 3–1 indicates that this promising isolate merits further investigation into its symbiosis with beet plants and its potential application in agriculture.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Project No. 31060018).

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Authors and Affiliations

  1. Institute of Microbiology, Xinjiang Academy of Agriculture Science, Urumqi, Xinjiang, China

    Yingwu Shi & Kai Lou

  2. Key Laboratory of Green Chemical Processes of Xinjiang Production and Construction Corps, College of Agronomy, Shihezi University, Shihezi, Xinjiang, China

    Yingwu Shi

  3. Department of Biotechnology, School of Life Science and Technology, Beijing Institute of Technology, Beijing, China

    Chun Li

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  1. Yingwu Shi
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  2. Kai Lou
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Correspondence to Kai Lou.

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Shi, Y., Lou, K. & Li, C. Growth promotion effects of the endophyte Acinetobacter johnsonii strain 3-1 on sugar beet. Symbiosis 54, 159–166 (2011). https://doi.org/10.1007/s13199-011-0139-x

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  • DOI: https://doi.org/10.1007/s13199-011-0139-x

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