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Fruit wrapping kraft coated paper promotes the isolation of actinobacteria using ex situ and in situ methods

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Abstract

Designing novel isolation methods could enhance the diversification of the available bacterial strains to biotechnology. In this study, the new ex situ and in situ cultivation methods are introduced for the isolation of actinobacteria. In the ex situ experiments, the soil suspension was spread on the isolation media located above some ordinary papers in immediate contact with the slurry of soil substrate and incubated for 16 weeks. The paper was wholly immersed in the cave soil for in situ cultivations, and the containers were buried under layers of soil in Hampoeil cave for 10 weeks. Fruit wrapping kraft coated paper, with 68.8% recovery of isolates, was a better choice in isolation of actinobacteria than other studied filter paper. Based on the molecular identification results, 19% of the isolates obtained from the in situ cultivation method had less than 98.5% similarity to known taxa of actinobacteria and potentially may represent new species. In contrast, in the standard cultivation method, 1.3% of the isolates had less than 98.5% similarity 16Sr RNA gene. This data shows that the introduced cultivation method is a promising technique for isolating less culturable or new actinobacteria.

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The datasets used and analyzed during the present study are available from the corresponding author on request.

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Acknowledgements

The authors wish to thank Leila Parvizi and Fahimeh Mohammadnia (Tooka Biotechnology Development Co.) for their technical assistance, Ali Aziminejad for his assistance in container preparation, and Behzad Ghomi and Fardin Hassandoost (from Maragheh Caving Club, Maragheh Etehad Caving Group) for their sincere cooperation in sample collection.

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Correspondence to Javad Hamedi.

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Almasi, F., Kafshnouchi, M., Mohammadipanah, F. et al. Fruit wrapping kraft coated paper promotes the isolation of actinobacteria using ex situ and in situ methods. Folia Microbiol 66, 1047–1054 (2021). https://doi.org/10.1007/s12223-021-00907-8

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  • DOI: https://doi.org/10.1007/s12223-021-00907-8

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