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Isolation and characterization of novel potassium-solubilizing purple nonsulfur bacteria from acidic paddy soils using culture-dependent and culture-independent techniques

  • Soil and Agricultural Microbiology - Research Paper
  • Published:
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Abstract

The current research as aimed (i) to isolate and select the purple nonsulfur bacteria (PNSB) possessing the potassium-solubilizing ability from acid paddy fields and (ii) to evaluate the ability to release the plant growth-promoting substances (PGPS) of selected PNSB. A total of 35 acid sulfate (AS) soil samples were collected in An Giang province, Vietnam. Then, 70 PNSB strains were isolated from the AS soil samples. In the current study, the isolated strains were screened and selected according to their tolerability to acidic conditions, ability to solubilize potassium, and characteristics of a plant growth promoter on basic isolation media with various incubation conditions. Therein, three strains, TT07.4, AN05.1, and AC04.1, presented the highest potassium solubilization under the microaerobic light (11.8–17.7 mg L−1) and aerobic dark (16.4–24.7 mg L−1) conditions and stresses from Al3+, Fe2+, and Mn2+ toxicity. The selected strains were identified as Rhodopseudomonas pentothenatexigens by the 16S rDNA sequence, with 99% similarity. The selected acidic-resistant strains possessed the traits of biofertilizers under both microaerobic light and aerobic dark conditions, with abilities to fix nitrogen (0.17–6.24; 7.93–11.2 mg L−1); solubilize phosphorus from insoluble compounds with 3.22–49.9 and 9.49–11.2 mg L−1 for Al-P, 21.9–25.8 and 20.2–25.1 mg L−1 for Ca-P, and 10.1–29.8 and 18.9–23.2 mg L−1 for Fe-P; produce 5-aminolevulinic acid (0.63–3.01; 1.19–6.39 mg L−1), exopolymeric substances (0.14–0.76; 0.21–0.86 mg L−1), indole-3-acetic acid (12.9–32.6; 13.6–17.8 mg L−1), and siderophores (28.4–30.3; 6.15–10.3%). The selected potassium-solubilizing strains have a great potential to apply in liquid form into rice seed and solid form in AS soils to supply nutrients and PGPS for enhancing rice growth and grain yield.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We thank Prof. Dr. Duangporn Kantachote for her assistance with the English language.

Funding

The research leading to these results received funding from Can Tho University under Grant Agreement No T2021-94.

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Authors and Affiliations

  1. Faculty of Crop Science, College of Agriculture, Can Tho University, Can Tho, Vietnam

    Nguyen Quoc Khuong, Le Vinh Thuc & Le Thi My Thu

  2. Department of Science, Demonstration School of Phetchaburi Rajabhat University, Phetchaburi Rajabhat University, Phetchaburi, Thailand

    Jakkapan Sakpirom

  3. Institute of Food and Biotechnology, Can Tho University, Can Tho, Vietnam

    Truong Oanh Oanh, Do Thi Xuan & Le Thanh Quang

  4. Experimental and Practical Area, An Giang University, An Giang, Vietnam; Vietnam National University, Ho Chi Minh City, Vietnam

    Ly Ngoc Thanh Xuan

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Conceptualization: Nguyen Quoc Khuong, Jakkapan Sakpirom; methodology: Nguyen Quoc Khuong, Jakkapan Sakpirom; formal analysis and investigation: Truong Oanh Oanh, Le Vinh Thuc, Le Thi My Thu, Do Thi Xuan, Le Thanh Quang, Ly Ngoc Thanh Xuan; writing—original draft preparation: Nguyen Quoc Khuong; writing—review and editing: Nguyen Quoc Khuong, Jakkapan Sakpirom; funding acquisition: Nguyen Quoc Khuong; resources: Nguyen Quoc Khuong, Jakkapan Sakpirom; supervision: Jakkapan Sakpirom.

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Correspondence to Jakkapan Sakpirom.

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Khuong, N.Q., Sakpirom, J., Oanh, T.O. et al. Isolation and characterization of novel potassium-solubilizing purple nonsulfur bacteria from acidic paddy soils using culture-dependent and culture-independent techniques. Braz J Microbiol 54, 2333–2348 (2023). https://doi.org/10.1007/s42770-023-01069-0

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