Effects of Si on the mitochondria respiration and lipid peroxidation of cucumber(Cucumis sativus L.) roots under salt stress

Using K2SiO4(1.0 mmol/L) as Si exogenous supply resource examined the changes of Coenzyme Q10(CoQ10),lipid peroxidation(LPO),hydrogen peroxide(H2O2) and respiration in isolated mitochondria of cucumber (Cucumis sativus L.) roots under salt stress.The experiment consists of three treatments,namely: CK,NaCl,and NaCl+Si.The results showed that NaCl stress increased H2O2 and malondialdehyde(MDA) contents in mitochondria,decreased membrane fluxion;reduced CoQ10 content,depressed activities of ATPase and cytochrome oxidase(CCO).Additional Si supplying for salt-stressed cucumber significantly decreased H2O2 and MDA content,inproved membrane fluxion,increased CoQ10 content,and promoted activities of ATPase and CCO.It indicated that additional Si supplying under salt stress could protect mitochondria by resuming the activities of ATPase and CCO,and increasing CoQ10 content,increase oxidative phosphorylation and energy metabolism,consequently mitochondria respiration increased.