Abstract
A part of rhizospheric bacteria are considered plant growth-promoting bacteria (PGPB) due to their positive effect on the plant growth and development. Plant growth-promoting bacteria based on their metabolic activity can be grouped as biofertilizers, fitostimulants, or biopesticides. These efficient bacteria due to various direct or indirect effects exerted on plants have crucial role in agricultural sustainability. Recently were reported diverse genera as PGPB like Acetobacter, Achromobacter, Arthrobacter, Azoarcus, Azospirillum, Azotobacter, Bacillus, Burkholderia, Frankia, Phyllobacterium, Pseudomonas, Serratia, and Rhizobium. Bacterial strains for this study were isolated from a natural habitat (raised bog) and agricultural environment. Selected bacterial strains based on 16S rRNA gene sequence analysis were identified as Achromobacter spanius, Delftia lacustris, Pseudomonas protegens, P. jessenii, and Acinetobacter lwoffii. These bacterial strains have different plant growth-promoting (PGP) activities like multi-stress resistances (temperature, pH, salinity) and others such as cellulose, phytin, and lecithin degradation, alkaline phosphatase and alkaline protease activity, and siderophore production. The selected strains were tested on plants either alone or in consortia. Based on the reports, it was confirmed that Delftia lacustris BI5, P. jessenii BI7, bacterial strains, and the bacterial consortia P. jessenii BI7 and A. lwoffii BI13 showed positive effect due to their PGP characteristics on wheat shoot growth under laboratory conditions. These promising strains have potential as inoculation agents in eco-friendly crop production contributing to environmental sustainability.
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