Alleviating Effect of Exogenous Melatonin on Erythrina tholloniana Seedlings under Salt Stress
To explore the effect of exogenous melatonin on the physiological mechanism of Erythrina tholloniana seedlings under salt stress.Using Erythrina tholloniana seedlings as materials,exogenous melatonin(0,50,100,150,200 μmol/L)was sprayed on the leaves under salt stress(100 mmol/L NaCl)to study the effects of exogenous melatonin on the growth,photosynthetic efficiency,and antioxidant activity of Erythrina tholloniana seedlings under salt stress.The results showed that salt stress significantly inhibited the growth of Erythrina seedlings,reduced osmotic regulation,antioxidant capacity,and photosynthetic efficiency.Under salt stress,spraying 100 μmol/L melatonin on leaves can significantly promote plant growth,increase the content of soluble sugar and protein,reduce electrolyte leakage rate,decrease malondialdehyde content,and promote the increase of activities of superoxide dismutase(SOD)and peroxidase(POD)and catalase(CAT)and ascorbic acid peroxidase(APX)in leaves;increasing the content of chlorophyll and carotenoids can promote the improvement of photosynthetic efficiency.However,high concentrations of exogenousmelatonin(150,200 μmol/L)actually lead to a certain degree of oxidative and osmotic stress.Therefore,100 μmol/L exogenous melatonin can effectively alleviate the osmotic stress,oxidative stress,and photosynthetic efficiency of Erythrina tholloniana seedlings under salt stress,which is beneficial for promoting the growth of Erythrina tholloniana seedlings.
salt stressErythrina thollonianaantioxidant systemphysiological characteristicsmelatonin
NETL
NSTL
万方数据
