Effect of lead on malondialdehyde, superoxide dismutase, proline activity and chlorophyll content in Capsicum annum.

This study investigated toxic impacts of lead over the concentrations of malondialdehyde (MDA), super oxide dismutase (SOD), proline activity and chlorophyll content in Capsicum annum. Despite a reduction in the growth of the plant, its MDA, SOD and proline contents were increased, whereas its chlorophyll content was decreased under the heavy metal stress, corresponding to the concentration of the metal ion. Increased amount of MDA was indicative for the formation of free radicals in plants under heavy metal stress, while increased levels of SOD and proline were pointed to the occurrence of a scavenging mechanism. The decrease in chlorophyll content is an indication of reduction in the growth of the plants leading to a decrease in the yield.