Hydrogen peroxide content and catalase activity on inoculation with root nodule bacteria of pea seedlings with different ability for nodulation

Hydrogen peroxide (H2O2) content and catalase activity were studied in pea (Pisum sativum L.) seedlings with a normal (cultivar Marat) and disrupted (pea mutants) process of nodulation that were inoculated with the nitrogen-fixing bacterium Rhizobium leguminosarum strain CIAM 1026. Differences in hydrogen peroxide content and catalase activity in pea seedlings with different ability for nodulation that were inoculated with rhizobia were found. It was assumed that H2O2 and catalase are involved in defensive and regulatory mechanisms in the host plant.