Antagonism and plant growth promoting traits of actinomycetes isolated from the rhizosphere of halophyte Atriplex halimus L.

Biocontrol is considered as an effective alternative to the application of agrochemicals, which are harmful environment, human, and animal health. In this study, twenty-six strains actinomycetes were isolated from rhizospheric arid soil halophyte Atriplex halimus L. ῾Guettaf’ in Biskra province, Algeria. The six isolates that have inhibited at least three phytopathogenic fungi among five tested (Fusarium oxysporum, Alternaria alternata, Fusarium solani, Aspergillus flavus Botrytis cinerea) selected, been vitro against bacteria (Pectobacterium carotovorum Streptomyces scabies). They also evaluated for their ability hydrolyze phosphate, elaborate siderophores, produce indole-3-acetic acid (IAA), antagonize S. scabies vivo (on radish seedlings). Based on physicochemical analyses, samples categorized alkaline extremely-saline. antagonism results revealed varying antifungal potential selected (Act11, Act16, Act17, Act18, Act23 Act24), about 50% able inhibit growth F. solani A. flavus, followed by 33.33% those having antagonized while alternata was found be most sensitive. Only Act18 has with inhibition diameter zone 19 ± 0.41 mm. However, trials showed four counteracted scabies. Among them, Act24 significantly positively affected root surface (P = 0.0062) prevented common scab. IAA detected all being highest producer (77.45 μg mL−1). Additionally, degradation phosphate exhibited capacity elaborating siderophores. assigned genius according morphological, physiological chemotaxonomical traits. sp. tolerate 7.5% NaCl concentration, prevent scab exhibit some plant attributes, may promising biocontrol agents applied saline soils.