Identification of antagonistic Streptomyces strains isolated from Algerian Saharan soils and their plant growth promoting properties
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Abstract. Aouar L, Boukelloul I, Benadjila A. 2020. Identification of antagonistic Streptomyces strains isolated from Algerian Saharan soils and their plant growth promoting properties. Biodiversitas 21: 5672-5683. To produce new bioactive substances of agricultural interest, extreme ecosystems can be a source of unexplored microorganisms. Accordingly, in this study, twenty-two actinobacteria strains were obtained from rhizospheric arid soils of palm groves collected from Biskra and El Oued in the Algerian Sahara. All isolates were examined for the in vitro antifungal potential towards phytopathogenic fungi: Aspergillus flavus, Verticillium dahlia, Rhizoctonia solani, Botrytis cinerea and Fusarium oxysporum as well as for their antibacterial property toward phytopathogenic bacteria: Streptomyces scabiei, Pectobacterium carotovorum and Agrobacterium tumefaciens. The three isolates (13%) that inhibited at least five pathogens were then selected, identified and assessed for their attributes to produce indole-3-acetic acid (IAA) and siderophores, to solubilize phosphate, and to antagonize Streptomyces scabiei in vivo. According to phylogenetic analysis performed with 16S rDNA sequence, chemotaxonomy and phenotypic characteristics, the strain SO1, which inhibited all tested pathogens, was assigned to Streptomyces flaveus. While, strains SO2 and SB1 were affiliated to Streptomyces enissocaesilis and Streptomyces albidoflavus, respectively. All strains produced IAA but only SO1 and SB1 were able to elaborate siderophores catecholate-type. Two strains SO1 and SO2 exhibited a capacity to solubilize phosphate and SO1 was able to suppress the pathogenic effect of Streptomyces scabiei on radish seedlings. The findings indicate that SO1 strain may reveal the potential for use as a biocontrol agent and plant growth promoter.
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References
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Apsari PP, Budiarti S, Wahyudi AT. 2019. Actinomycetes of rhizosphere soil producing antibacterial compounds against urinary tract infection bacteria. Biodiversitas 20(5): 1259-1265. doi.org/10.13057/biodiv/d200504.
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Chaiharn M, Lumyong S. 2011. Screening and optimization of indole-3-acetic acid production and phosphate solubilization from rhizobacteria aimed at improving plant growth. Curr Microbiol 62: 173-181.
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de Oliveira MF, da Silva MG, Van Der Sand ST. 2010. Anti-phytopathogen potential of endophytic actinobacteria isolated from tomato plants (Lycopersicon esculentum) in southern Brazil, and characterization of Streptomyces sp. R18 (6), a potential biocontrol agent. Res Microbiol 161: 565-572. doi.org/10.1016/j.resmic.2010.05.008.
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Ezra D, Castillo UF, Strobel GA. 2004. Coronamycins, pepetide antibiotics produced by a verticillate Streptomyces sp. (MSU-2110) endophytic Monstera. Microbiol 150: 785-793.
Fisher MC, Hawkins NJ, Sanglard D, Gurr SJ. 2018. Worldwide emergence of resistance to antifungal drugs challenges human health and food security. Science 360: 739-742. DOI: 10.1126/science.aap7999.
Franco-Correa M, Quintana A, Duque C, Suarez C, Rodríguez MX, Barea JM. 2010. Evaluation of actinomycete strains for key traits related with plant growth promotion and mycorrhiza helping activities. Appl Soil Ecol 45(3): 209-217. doi.org/10.1016/j.apsoil.2010.04.007.
Gonzalez JM, Saiz-Jimenez C. 2005. A simple fluorimetric method for the estimation of DNA–DNA relatedness between closely related microorganisms by thermal denaturation temperatures. Extremophiles 9: 75-79.
Gangwar M, Dogra S, Gupta UP, Kharwar RN. 2014. Diversity and biopotential of endophytic actinomycetes from three medicinal plants in India. Afri J Microbiol Res 8(2), 184-191. doi.org/10.5897/AJMR2012.2452.
Goredema N, Ndowora T, Shoko R, Ngadze E. 2020. In vitro suppression of pathogenic fungi by Streptomyces spp. Afr Crop Sci J 28(2): 141-149.
Goudjal Y, Zamoum M, Meklat A, Sabaou N, Mathieu F, Zitouni A. 2016. Plant-growth-promoting potential of endosymbiotic actinobacteria isolated from sand truffles (Terfezia leonis Tul.) of the Algerian Sahara. Ann Microbiol 66(1) : 91-100.
Goudjal Y, Toumatia O, Yekkour A, Sabaou N, Mathieu F, Zitouni A. 2014. Biocontrol of Rhizoctonia solani damping-off and promotion of tomato plant growth by endophytic actinomycetes isolated from native plants of Algerian Sahara. Microbiol Res 169(1): 59-65. doi.org/10.1016/j.micres.2013.06.014
Hider RC, Kong X, 2010. Chemistry and biology of siderophores. Nat Prod Rep 27: 637-657.
Islam MR, Jeong YT, Ryu YJ, Song CH, Lee YS. 2009. Isolation, identification and optimal culture conditions of Streptomyces albidoflavus C247 producing antifungal agents against Rhizoctonia solani AG2-2. Mycobiol 37(2): 114-120.
Jog R, Pandya M, Nareshkumar G, Rajkumar S. 2014. Mechanism of phosphate solubilization and antifungal activity of Streptomyces spp. isolated from wheat roots and rhizosphere and their application in improving plant growth. Microbiol 160(4): 778-788. doi.org/10.1099/mic.0.074146-0.
Khalil M, Lerat S, Beaudoin N, Beaulieu C. 2019. The plant pathogenic bacterium Streptomyces scabiei degrades the aromatic components of potato periderm via the ?-ketoadipate pathway. Front Microbiol. doi.org/10.3389/fmicb.2019.02795.
Khamna S, Yokot A, Lumyong S. 2009. Actinomycetes isolated from medicinal plant rhizosphere soils: diversity and screening of antifungal compounds, indole-3-acetic acid and siderophore production. World J Microbiol Biotechnol 25: 649-655.
Khamna S, Yokota A, Peberdy JF, Lumyong S. 2010. Indole-3-acetic acid production by Streptomyces sp. isolated from some Thai medicinal plant rhizosphere soils. EurAsian J BioSci 4(1): 23-32.
Lahoum A, Sabaou N, Bijani C, Bouras N, Pont F, Snini SP, Mathieu F. 2019. Antimicrobial activities of novel bipyridine compounds produced by a new strain of Saccharothrix isolated from Saharan soil. Saudi Pharm J 27: 56-65. doi.org/10.1016/j.jsps.2018.07.019.
Laidi FR, Elshafei A, Saker M, Bengraa C, Hacene H. 2007. Screening, isolation and characterization of a novel antimicrobial producing actinomycete, strain RAF 10. Biotechnol 6 (4): 489-496.
Lechevalier MP, Lechevalier HA. 1980.The chemotaxonomy of actinomycetes. In: Dietz A, Thayer DW (eds.) Actinomycete Taxonomy (Special Publication 6), Arlington, Virginia.
Lee J, Postmaster A, Soon HP, Keast D, Carson KC. 2012. Siderophore production by actinomycetes isolates from two soil sites in Western Australia. Biometals 25: 285-296.
Lee JY, Kim BS, Hwang BK. 1995. Numerical Identification of Streptomyces fIaveus producing antibiotic substances inhibitory to plant pathogenic fungi. J Microbiol Biotechnol 5(6): 324-334.
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