Abstract
Aim. Actinomycetes are one of the main groups of rhizospheric bacteria involved in plant growth and health enhancement. This makes them promising candidates for the development of biopreparations in agriculture. The aim of this study was to explore the plant growth promoting actinobacteria isolated from P. viridiglaucescens rhizosphere. Methods. Standard microbiological and statistical methods were used. Results. 20 % of the isolates were found to be potentially capable of siderophore synthesis; 12 % – solubilized inorganic phosphorus; 26 % – assimilated atmospheric nitrogen; and 55 % – produced auxin-related substances. A significant part of the isolates produced auxin-related substances at a concentration of up to 20 μg/ml. The majority of isolates had at least one plant growth promoting property. However, among the actinomycetes, there were representatives that combined two or more properties. The strain Streptomyces sp. Pv 4-122.1 had a significant positive impact on the radish germination of the “Krakivianka” variety, while another actinomycete strain – Pv 4-204 – exhibited potential herbicidal activity. Conclusions. A significant part of the isolates has a high potential for the production of plant growth promoting compounds. Individual isolates can serve as the basis for biopreparations both to enhance plant growth and with herbicidal effects.
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