an activator of genes expressed in alkaline conditions and a repressor of those expressed in acidic conditions, undergoes two processing proteolyses, the first being pH-signal dependent and the second proteasomal. Moreover, obvious differences in control efficacy of green mold infections on lemons and oranges were observed among salt solutions with the same pH. Therefore, it can be speculated that pH was not solely responsible for the inhibitory activity of NaHCO3, and the exact mechanism of action of NaHCO3 againstP. expansum remained to be elucidated further.