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Streptomyces species from the rhizosphere of the medicinal plant Artemisia herba-alba Asso: screening for biological activities

Biological activities of rhizospheric Streptomyces strains

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Abstract

This work aims to study cultivable actinobacterial isolated from the rhizosphere soil of Artemisia herba-alba Asso; an important component of the Mediterranean dry steppe flora. The isolates functional attributes with respect to antifungal, in vitro growth-promotion properties and enzymatic capacities, were studied. A total of eleven cultivable actinobacterial strains were isolated and identified as Streptomyces species by 16S rRNA gene sequencing. The eleven Streptomyces strains were positive for the production of almost all the hydrolytic enzymes tested, while the majority had ACC deaminase activity (6 strains) and exhibited ammonia (7 strains), siderophores production (9 strains) and phosphate solubilization (6 strains). Two out of the eleven strains named Streptomyces sp. BKS30 and BKS40 showed antifungal activities. One promising Streptomyces sp. strain BKS30 that was in-depth characterized morphologically and biochemically was further tested for its antifungal activity for the filtrate and the butanolic extract against nine target-fungi as well as for its antioxidant activity by DPPH and ABST tests. The obtained results demonstrate that Streptomyces species isolated from the rhizosphere of Artemisia herba-alba Asso have the potential for different biological activities including antifungal and antioxidant activities particularly for strain BKS30.

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Acknowledgements

The authors acknowledge the Ministry of Higher Education and Scientific Research of Algeria. We are grateful to the late Prof. Nasserdine Sabaou (1956–2019) for his great contribution to this work.

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N.D., A.M. and R.G-T. conceived and managed the project. N.D., K.O-A., S.A.S., S.S. and A.N. performed the experiments. C.V-V., A.M. and A.N. performed molecular analysis. N.D. and N.B. drafted the manuscript which was critically reviewed by all of the authors.

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Correspondence to Atika Meklat.

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The authors declare that they have no competing interests.

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Djemouai, N., Meklat, A., Gaceb-Terrak, R. et al. Streptomyces species from the rhizosphere of the medicinal plant Artemisia herba-alba Asso: screening for biological activities. Biologia 77, 2281–2299 (2022). https://doi.org/10.1007/s11756-022-01070-2

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  • DOI: https://doi.org/10.1007/s11756-022-01070-2

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