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Exploring plant growth-promoting, biocatalytic, and antimicrobial potential of salt tolerant rhizospheric Georgenia soli strain TSm39 for sustainable agriculture

  • Biotechnology and Industrial Microbiology - Research Paper
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Abstract

To explore the in vivo and in vitro plant growth promoting activities, biocatalytic potential, and antimicrobial activity of salt tolerance rhizoactinobacteria, rhizospheric soil of a halotolerant plant Saueda maritima L. was collected from Rann of Tiker, near Little Rann of Kutch, Gujarat (India). The morphology analysis of the isolated strain TSm39 revealed that the strain belonged to the phylum actinobacteria, as it was stained Gram-positive, displayed filamentous growth, showed spore formation and red pigment production on starch casein agar (SCA). It was identified as Georgenia soli based on 16S rRNA gene sequencing. The Georgenia soli strain TSm39 secreted extracellular amylase, pectinase, and protease. It showed in vitro plant growth-promoting (PGP) activities such as indole acetic acid (IAA) production, siderophore production, ammonia production, and phosphate solubilization. In vivo plant growth-promoting traits of strain TSm39 revealed 30% seed germination on water agar and vigor index 374.4. Additionally, a significant increase (p ≤ 0.05) was found in growth parameters such as root length (16.1 ± 0.22), shoot length (15.2 ± 0.17), the fresh weight (g), and dry weight (g) of the roots (0.43 ± 0.42 and 0.32 ± 0.12), shoots (0.62 ± 0.41 and 0.13 ± 0.03), and leaves (0.42 ± 0.161 and 0.14 ± 0.42) in treated seeds of Vigna radiata L. plant with the strain TSm39 compared to control. The antibiotic susceptibility profile revealed resistance of the strain TSm39 to erythromycin, ampicillin, tetracycline, and oxacillin, while it displayed maximum sensitivity to vancomycin (40 ± 0.72), chloramphenicol (40 ± 0.61), clarithromycin (40 ± 1.30), azithromycin (39 ± 0.42), and least sensitivity to teicoplanin (15 ± 0.15). Moreover, the antimicrobial activity of the strain TSm39 was observed against Gram’s positive and Gram’s negative microorganisms such as Shigella, Proteus vulgaris, and Bacillus subtilis. These findings indicated that the Georgenia soli strain TSm39 has multiple plant-growth-promoting properties and biocatalytic potential that signifies its agricultural applications in the enhancement of crop yield and quality and would protect the plant against plant pathogens.

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Acknowledgements

JC gratefully acknowledges the DST-SERB (Department of Science and Technology — Science and Engineering Research Board) New Delhi, India, for the Junior & Senior Research Fellowship. The authors also acknowledged the infrastructural and financial support from Saurashtra University, Rajkot, Gujarat, India.

Funding

This work was supported by the DST-SERB (Department of Science and Technology — Science and Engineering Research Board), New Delhi, India (Sanction order no. ECR/2016/000928 Dated: 20.03.2017).

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  1. Department of Biosciences, Saurashtra University, Rajkot, 360005, Gujarat, India

    Jagruti Chauhan & Sangeeta Gohel

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JC carried out the laboratory work and drafted the first manuscript; SD conceptualized the study design, supervised the study, edited, and reviewed the manuscript. All the authors approved the submission of the final version of the manuscript for publication.

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Correspondence to Sangeeta Gohel.

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Chauhan, J., Gohel, S. Exploring plant growth-promoting, biocatalytic, and antimicrobial potential of salt tolerant rhizospheric Georgenia soli strain TSm39 for sustainable agriculture. Braz J Microbiol 53, 1817–1828 (2022). https://doi.org/10.1007/s42770-022-00794-2

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