Strain sp. P-56 Produces Nonactin and Possesses Insecticidal, Acaricidal, Antimicrobial and Plant Growth-Promoting Traits.

Streptomycetes produce a huge variety of bioactive metabolites, including antibiotics, enzyme inhibitors, pesticides and herbicides, which offer promise for applications in agriculture as plant protection and plant growth-promoting products. The aim of this report was to characterize the biological activities of strain sp. P-56, previously isolated from soil as an insecticidal bacterium. The metabolic complex was obtained from liquid culture of sp. P-56 as dried ethanol extract (DEE) and possessed insecticidal activity against vetch aphid ( Buckt.), cotton aphid Glov.), green peach aphid ( Sulz.), pea aphid Harr.) and crescent-marked lily aphid Buckt.), as well as two-spotted spider mite (). Insecticidal activity was associated with production of nonactin, which was purified and identified using HPLC-MS and crystallographic techniques. Strain sp. P-56 also showed antibacterial and antifungal activity against various phytopathogenic bacteria and fungi (mostly for , and ), and possessed a set of plant growth-promoting traits, such as auxin production, ACC deaminase and phosphate solubilization. The possibilities for using this strain as a biopesticide producer and/or biocontrol and a plant growth-promoting microorganism are discussed.