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H2O2 content was studied in the roots and epicotyls of pea (Pisum sativum L.) with normal (cultivar Marat) and disturbed (non-nodulating mutant K14 and hypernodulating mutant Nod3) regulation of root nodulation after inoculation with active industrial strain of Rhizobium leguminosarum by. viceae 250a/CIAM 1026. Pea biotypes differed by H2O2 content in the roots and epicotyls. Exogenous salicylic acid (SA) (0.2 mM) affected H2O2 and SA contents in the roots in an inoculation-dependent manner. The involvement of hydrogen peroxide and SA as signaling molecules as well as of antibacterial agents in the pea-rhizobium interaction at the initial stages of symbiosis is proposed.
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