海藻糖对干旱胁迫下谷子幼苗生理特性的影响OA

In order to screen the optimal concentration of trehalose that can effectively improve the drought resistance of foxtail millet seedlings,pot experiments were carried out in this study.The foxtail millet seedlings of'Nenxuan 20'were used as experimental materials,and 18％PEG-6000 solution was used to simulate drought stress.The effects of different concentrations of trehalose(10,15 and 20 mmol·L-1)on antioxidant enzyme activity,osmotic adjustment substances,membrane lipid peroxidation and yield components of foxtail millet seedlings under drought stress were studied.The results showed that the activities of superoxide dismutase(SOD),peroxidase(POD)and catalase(CAT)were significantly increased after spraying trehalose under drought stress.On the 12th day of drought stress,the most obvious effect of T2 treatment was 27.11％,21.33％and 20.15％higher than that of T0,respectively.The content of malondialdehyde(MDA)was significantly reduced by 41.58％,and the content of osmotic adjustment substances(proline,soluble sugar,soluble protein)and relative water content(RWC)were increased,which alleviated the damage of drought stress to millet seedlings.In addition,it was found that there was a concentration effect of trehalose on the improvement of drought resistance of millet seedlings under drought stress.High concentration of trehalose treatment inhibited RWC and soluble sugar content,and promoted the accumulation of MDA content.The optimum concentration of trehalose treatment was 15 mmol·L-1,which could maximize the drought resistance of millet seedlings.