Effect of phenolic acids on growth and activities of mem brance protective enzymes of muskmelon grafted on blackseed pumpkin

Hami muskmelon was taken as experimental subject.Phenolic acids suchas vanillic acid,vanillin and P-hydroxy benzoic acids treatments were applied to study the effects of phenoic on the growth and activities of protective enzymes of muskmelon.The results showed that the three types of phenolic acids inhabited the growth and yield of non-grafted muskmelon.The inhibitory effects were enhanced with increasing concentration of phenolic acids and prolonging time of treatment.Vanillic acid had stronger inhibition effect than vanillin and P-hydroxy benzoic acids.For protective enzymes system (peroxidase (POD),catalase (CAT),superoxide dismutase (SOD)),the result indicated that the grafted muskmelon POD,CAT and SOD activity increased from the begining and under higher concentration and had an decrease of malonic aldehyde (MDA) content.However the control activity decreased in POD,CAT,SOD and increased in malonic aldehyde (MDA) content.It proved that little activity oxygen was produced and protective enzymes were destroyed under all level concentration of phenolic acids in grafted muskmelon roots.