Study on the Effect of Exogenous Melatonin(MT)and Ca2+on Improving Salt Tolerance in Melon Seedlings under Salt Stress
Using the thick-skinned melon(Cucumis melo L.)variety'West State honey No.25'as the test material,the effects of exogenous melatonin(MT)and Ca2+on the growth,root activity,and antioxidant enzyme activity of melon seedlings under 150 mmol/L NaCl salt stress were studied in a light culture room(day and night temperature of 28 ℃/25 ℃)using substrate potted plants for hydroponic cultivation.The results showed that compared with the control(ck),salt stress treatment significantly inhibited the growth of melon seedlings,reduced root activity and antioxidant enzyme activities such as superoxide dismutase(SOD),catalase(CAT),and peroxidase(POD).Under salt stress,the application of exogenous melatonin(MT)or Ca2+alone,as well as the combination treatment,could improve the growth status of melon seedlings,enhance root vitality and antioxidant enzyme activity,and significantly alleviate salt stress damage to melon seedlings.Among them,the combination treatment of melatonin(MT)and Ca2+had a better effect,which could effectively enhance the salt tolerance of melon seedlings,both of which had a complementary and synergistic effect.
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