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The rhizosphere of olive trees ( Olea europaea  L.) is a source of bacteria with a high potential for biocontrol and plant growth promotion. In the present study, two native olive tree gram-negative bacteria were isolated from the rhizosphere of century-old trees in the region of Zouala (south-eastern Morocco), known for its arid climate and saline soils. The strains  Pantoea agglomerans  and  Enterobacter ludwigii  exhibited high tolerance to high PEG and NaCl concentrations, and significant plant growth-promoting (PGP) potential  in vitro . The two strains efficiently solubilised phosphate in its two forms (TCP and RP), and Mica as a source of potassium and produced IAA. The two strains exhibited  in vitro  inhibition ability against  Verticillium dahliae  with partial inhibition of the growth of the mycelium by the strain  P. agglomerans  MRC_ZO_17. Greenhouse experiments showed that olive tree seedlings treated with the  E. ludwigii  MRC_ZO_97 strain significantly improved growth (dry weight) in the presence and absence of the pathogen compared to untreated plants, while the  P. agglomerans  MRC_ZO_17 strain showed significant effects on seedling growth only in the presence of the pathogen  V. dahliae  OV1 defoliating pathotype. Both strains showed high exopolysaccharides (EPS) production and good biofilm formation, making them excellent plant growth-promoting rhizobacteria (PGPRs) and Biological Control Agents (BCAs) with great potential to survive in soil under stress conditions.

biocontrol science and technology

The ability of two indigenous bacteria isolated from Moroccan olive tree to promote the growth of olive seedlings in the presence of the pathogen  Verticillium dahliae