The possible role of transmembrane adenylate cyclase of a plant pathogen Pseudomonas siringae pv. pisi and of a symbiotroph Rhizobium leguminosarum bv. viceae in control of the activity of their virulence factors (cellulases and pectinases, the enzymes degrading plant cell walls) was investigated. While transmem brane adenylate cyclase was found to control the activity of virulence factors in both pathogens and sym bionts, the strategies employed by these microorganisms in molecular dialogue with plants involving the ade nylate cylcase signal system exhibited both similarities and cardinal differences.

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