Inhibitory activity of resveratrol and its derivatives against phytopathogenic fungi

In order to clear the prospects of stilbene compounds in agricultural disease prevention and treatment,effects of resveratrol (Ⅰ)and its derivatives (Ⅱ-Ⅴ )on mycelial growth,mycelial morphology,and spore germination were tested in vitro and disease prevention principles were studied in vivo by using leaf method and pot-culture method.Results showed that 5 tested compounds had different degrees of inhibition effects on mycelial growth of 6 tested pathogens,especially to A.solani,in which 3,5-dihydroxy-4'-methoxy-stilbene (Ⅲ) showed higher inhibitory activity than other compounds.Resveratrol caused mycelial malfornation and inhibited the spore germination with no changes in morphology of A.solani.There was a conclusion that resveratrol can inhibit the infection of A.solani and play a protective action in vivo.