Effects of Salicylic Acid on Resistance Physiology of Sweet Glutinous Corn Seedlings under Low Temperature and Salt Stress
To investigate the resistance of maize seedlings treated with salicylic acid(SA)under low temperature and salt stress,the"sweet glutinous 182"maize was used as the experimental material,and its growth characteristics,the os-moregulation substances content,the Malondialdehyde(MDA)content,and the activities of Catalase(CAT)and Peroxi-dase(POD)enzymes between different treatment of seedlings were measured through foliar spraying with salicylic acid,so as to determine the effects of salicylic acid on resistance physiology of sweet glutinous corn seedlings under low temperature and salt stress.The results showed that the normal growth of sweet glutinous maize seedlings was significantly inhibited by 3 ℃ low temperature and 100 mmol/L NaCl treatment.Spraying with different concentrations of salicylic acid can effective-ly alleviate the adverse effects of stress on the seedlings,with the best effect of 40 mg/L SA treatment.Spraying 40 mg/L salicylic acid caused the plant height,dry matter accumulation,relative water content,soluble sugar and soluble protein content of maize seedlings increased to varying degrees,and the MDA content was decreased.Both CAT and POD activities of maize seedlings with 40 mg/L SA treatment were all increased.Therefore,it is speculated that foliar spraying with sali-cylic acid may enhance the osmotic regulation ability of plants under stress conditions,enhance the activity of antioxidant enzymes,reduce membrane damage,and comprehensively improve the cold and salt resistance of sweet glutinous maize seedlings.
maizesalicylic acidlow temperature stresssalt stressresistance physiology
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