Effect of Naringenin on the Growth of Planktonic Culture and Biofilms As Well As the cAMP Level and Pectinase Activity of Pseudomonas syringae pv. pisi and Rhizobium leguminosarum bv. viciae

The effect of naringenin on the growth dynamics of planktonic culture, biofilm density, and the concentration of cAMP and pectinase activity of P. syringaei and R. leguminosarum was investigated. It was shown that naringenin did not affect the growth dynamics of the planktonic culture of P. syringaei, but the titer of the R. leguminosarum culture decreased at 1 nM naringenin. 500 pM naringenin suppressed the density of P. syringae biofilms and stimulated it in rhizobia. The cAMP level under the influence of both naringenin concentrations increased to varying degrees in both planktonic and biofilm cultures. Naringenin completely suppressed pectinase activity in P. syringaei biofilms but stimulated it in R. leguminosarum. Thus, naringenin can be considered as an exogenous promising regulator for practical application in the fight against Pseudomonas syringae pv. pisi.