The aim of this study was to investigate the effect of naringenin on the growth dynamics of planktonic culture, biofilm density, as well as the concentration of cAMP and pectinase activity of P. syringae and R. leguminosarum. The studies showed that naringenin did not affect the growth dynamics of the planktonic culture of P. syringae, 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 both in planktonic and biofilms in both cultures. Naringenin completely suppressed pectinase activity in P. syringae 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.
Lomovatskaya et al. (Wed,) studied this question.