Assessment the impact of certain growth promoting Rhizobacteria strains on symbiotic effectiveness of Arbuscular mycorrhizal fungi [electronic resource].

Includes references.

A pot experiment was carried out to determine the effect of different combinations of arbuscular mycorrhizal fungi (AMF) and five strains of plant growth rhizobacteria (Azospirillum, Azotobacter, Enterobacter, Klebsiella, Pseudomonas or Bacillus) on mycorrhizal formation and growth of wheat and tomato plants in calcareous or alkaline soils. Results indicated that inoculation with GPRB strains and AMF increased root, shoot and total dry weight of tomato plants significantly in both soils compared to inoculation with AMF. Nitrogen and phosphorus uptake were also increased in both soils. No synergistic effect between mycorrhizal fungi and GPRB was observed in mycorrhizal root infection and mycorrhizal spore numbers in tomato and wheat plants grown in the alkaline soil. However, Pseudomonas inoculation significantly increased percentage of mycorrhizal infection in tomato and wheat plants grown in calcareous soil. Dual inoculation of tomato and wheat plants with Pseudomonas and mycorrhizal fungi improved their growth under calcareous and alkaline soils significantly than other treatments. Results evidenced that the symbiotically effectiveness of AM fungi was affiliated to the associated bacterial species. The GPRBs evaluated did not decrease plant growth or nutrients content in any mycorrhizal plant.

Summary in Arabic.

1