A comparative proteomic analysis of the early response to compatible symbiotic bacteria in the roots of a supernodulating soybean variety

►The early stages of symbiosis between soybean plants and root nodule bacteria. ►Supernodulating (En-b0-1), non-nodulating (En1282), and their parental normal-nodulating (Enrei) varieties. ►A total of 56 proteins were identified in normal-nodulating variety after bacterial inoculation. ►The supernodulating and non-nodulating varieties responded oppositely to bacterial inoculation with respect to the expression of 11 proteins. ►Suppression of the autoregulatory mechanism in the supernodulating variety might be due to negative regulation of defense and signal transduction-related processes.