Ca (2 +)-cam Effect On Maize Superoxide Dismutase Activity

As we all know, Ca24-CaM has been found to be the most important signal conductive system in plant cell. The to extmcellular signal into endocellular diffet nt physiological and biochemical pmcess. This article flied to can adjust activity of SOD. Maize (Dahuang) wex used as expenxnental matenal Ca (2+) was put into SOD in vitro,and SOD activity was enhanced .Iti addition ,treaUtient SOD with EGTA BAPTA in vitro, EGTA.. BAPTA chelated calcium and reduced SOD activity .Namely part of SOD is relay on Ca (2+) . Ca (2+) was put into SOD after added BAPTA, SOD activity was recoverecL This suggest that this inhil,itoiy is reversible. SOD was treated with different Ca²⁺ sourse ,the effects were uniform. SOD was treated with different cation, only when Ca²⁺ were added, SOD activity was enhanced. Namely the anablec effects of Ca²⁺ were especial, and were not common of all caation Subsequentlytreatment SOD with CaM Ca²⁺-CaM-. CPZs TFPor CaM and Ca²⁺-CaM enhanced SOD activity. Calmodu]in antagonists CPZ. TFP and reduced SOD activity . CaM was put into SOD after added W7, SOD activity was recovered. That suggest this inhibitoiy is reversible. Namely part of SOD is relay on Cay-CaM It vetified that calcitnn message system can adjust SOD activity. It is likely to change environmental stimulation into endocellular different physiological and biochemical process through the change of extracellular CaM concentration. It included enhanced SOD activity to defend oxygen stress in plant. We suggest that calcium message system can adjust antioxidization system activity.