Abstract

Plant-growth-promoting bacteria isolated from the rhizosphere, phyllosphere and soil of the root zone in different climatic regions of Germany and Uzbekistan were analysed for plant-growth-promoting effects and nutrient uptake on cotton and wheat. The investigations were carried out in pot experiments with loamy sand in Germany and calcisol soil in Uzbekistan. Phytoeffective plant-growth-promoting bacteria from different climates as well as from different crops may be isolated. They may belong to different genuses. Growth promoting effects are influenced by the plant and soil types. Inoculation with effective bacterial strains Rhizobium trifolii R39, Pantoea agglomerans PF76/4 from the moderate German climate increased the root and shoot growth of cotton and wheat in loamy sand. Phytoeffective bacterial isolates Pseudomonas. denitriflcans PsD6, Bacillus amiloliguefaciens BcA12 from semi-arid Uzbekistan climates had a greater effect on winter wheat in a nutrient-poor calcisol soil than in nutrient-rich loamy sand. Bacterial inoculation also resulted in significantly higher values for N,P,K contents of plant components. Growth-promoting bacteria produced the phytohormone auxin. Some bacteria capable of nitrogenase activity, produced B-complex vitamins and different proteins. The bacterial isolates survived after root and shoot inoculation in the rhizosphere and the soil of the root zone of wheat.

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