Abstract
The influence of nodule bacteria, Azotobacter and exogenous phytohormones (IAA and cytokinins) on H 2 O 2 content and the activity of peroxidase in the roots of pea seedlings was studied. H 2 O 2 content, both in control samples and roots inoculated using Rh.lg, and additionally when combined with Azotobacter, was increased over 24 hours following exposure. H 2 O 2 content was lower in seedlings inoculated by Rh.lg than in control plants, and higher in those exposed to Azotobacter. In variants with exogenous phytohormones, the maximum content of H 2 O 2 was reached in 10 minutes; after 24 hours, it became lower than in the control plants. Exogenous phytohormones and Azotobacter during the inoculation of pea plants by Rh. lg. result in significant responses relevant for the regulation of the initial stages of symbiont interaction.
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