[Objective]To explore the effect of exogenous spermidine on the physiological characteristics of potato seedlings under NaCl stress,so as to provide technical reference for potato planting in salinized areas of Xinjiang.[Methods]The virus-free seedling of Jindu 16 potato was used as the experimental material,and the effects of exogenous Spd on plant growth,antioxidant enzyme activity and osmotic regulator content of potato leaves were studied by simulating salt stress treatment with different concentrations of NaCl.[Results]Salt stress inhibited the growth of potato plants.The activities of antioxidant enzymes such as superoxide dis-mutase(SOD),peroxidase(POD),catalase(CAT)and ascorbate peroxidase(APX)were promoted by low salt stress and inhibited by high salt stress.The contents of non-enzymatic antioxidant enzymes such as ascorbic acid(ASA)and glutathione(DSH)were decreased.The contents of proline,soluble sugar and amino acid in-creased.Exogenous Spd maintained the normal physiological and metabolic function of plants by increasing the content of chlorophyll,root activity,regulating the content of osmotic regulatory substances,and enhancing the activity of antioxidant enzymes.[Conclusion]Exogenous Spd can improve the salt tolerance of potato and alle-viate the inhibitory effect of salt stress on potato plants,and 0.9 mmol/L Spd(S3)concentration has the most obvious alleviating effect.
关键词
马铃薯/NaCl胁迫/亚精胺/幼苗生长/生理生化特征
Key words
potato/NaCl stress/spermidine/seedling growth/physiological and biochemical characteristics
维普
万方数据