Effects of application of activated carbon or carbonized maize cobs on the autotoxic effects of decomposed tomato roots extracts

We examined the effects of applied activated carbon, carbonized maize cobs and decomposed tomato roots extracts (DBE) on the growth and contents of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) activities and malonaldehyde (MDA) content in tomato roots in hydroponic culture with perlite as substrate. The high concentration DBE inhibited the growth of tomato seedlings. The DBE application, first increased the activities of SOD, POD and CAT in tomato and then decreased during the growth. The autotoxic effects were observed in tomato roots with high MDA contents. The application of activated carbon and carbonized maize cobs enhanced the negative effects, but decreased the change in enzymes activities and MDA contents.