Effects of Foliar Silicon and Zinc Fertilizer Application on Growth and Physiological Response of Wheat Seedlings under Cadmium Stress
[Objective]This study is aimed to investigate the effects of foliar spray of silicon(Si)and zinc(Zn)fertilizers on the growth of wheat and the accumulation of cadmium(Cd)under conditions of Cd stress.[Method]Using Triticum aestivum cv.Chuanmai 602 as material,a hydroponic system was employed to simulate Cd pollution conditions.Wheat seedlings were treated with either Si fertilizer,Zn fertilizer,or combination of both applied to the foliage.[Result]①Under Cd stress,foliar application of Si and/or Zn fertilizer resulted in increased plant biomass and chlorophyll content,with the effective-ness ranking as follows:Si＞Si&Zn＞Zn.②The application of foliar fertilizers resulted in a reduction of above-ground Cd content in wheat by 30.31％,16.41％,and 14.16％following single application of Si and Zn fertilizers,as well as their combined application,respectively.③The application of foliar fertil-izer also alleviated the oxidative stress in wheat leaves by decreasing levels of malondialdehyde(MDA)and hydrogen peroxide(H2O2),while enhancing the activities of superoxide dismutase(SOD)and guaia-col peroxidase(POD).[Conclusion]Under Cd stress,the foliar application of Si and Zn fertilizers can promote the growth and development of wheat seedlings.These treatments enhance the activity of antioxi-dant enzymes,thereby improving the overall antioxidant capacity of plants.Consequently,it reduces Cd uptake and mitigates its toxic effects on wheat seedlings.Notably,the application of Si fertilizer alone on the leaf surface demonstrates the most pronounced efficacy.
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