Effects of Exogenous Salicylic Acid on the Physiological and Biochemical Characteristics of Cotton Seedlings Under Salt Stress
The experiment was to study the effect of exogenous salicylic acid of 0.1 mmol/L spraying to the surface of the leaves on physiological and biochemical characteristics of cotton seedling under NaCl (100 mmol/L)stress,by using nutrient solution culture to cultivate plants.The results indicated that,the SA of 0.1 mmol/L spraying on the surface of cotton leaves every two days more significantly relieved the damage caused to the cotton seedlings under NaCl (100 mmol/L) stress than every day and every three days,significantly improved the contents of soluble protein,proline (Pro) and anti oxidant enzymes (SOD,POD,CAT) activity; reduced the O2-production rate,the content of H2O2 and malondialdehyde (MDA) of cotton under salt stress.Compared with excess SA on cotton seedlings spraying the leaves every two days under salt stress,excessive SA spraying the leaves on cotton seedlings every day significantly reduced the relief or even aggravated the salt injury,so that spraying SA on cotton leaves every two days could increase antioxidant enzyme systems and other channels to improve the ability of resistance to salt stress,reduce and alleviate the salt stress injury on cotton seedlings.
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