Effects of Exogenous Chitosan on Physiological Characteristics in Waxy Maize Seedlings under Salt Stress
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Rui Guo, Dengyan Yin, Chunyang Xiang, Qiu Zhao, Jin Du and Xiuping Tian
Abstract: Salinized soil is widely distributed in Tianjin. Waxy corn has high nutritional value and plays an important role in urban agriculture. It is very important to study the salt-tolerant characteristics of waxy corn for the utilization of salinized soil and using salinized soil to plant waxy corn. The effects of exogenous chitosan on the physiological characteristics of waxy corn seedlings under different salt stress were analyzed using jinnuo 72 as test material. The results showed that the content of soluble protein and proline in waxy corn seedlings treated with exogenous chitosan were significantly increased compared with the control group in the range of 0.04% to 0.52% soil salt content. The content of soluble sugar, catalase activity and superoxide dismutase activity in waxy corn seedlings treated with exogenous chitosan were significantly increased compared with the control group in the range of 0.20% to 0.52% soil salt content. The content of malondialdehyde in waxy corn seedlings treated with chitosan was significantly reduced compared with the control group under salt stress. Under certain salt stress, exogenous chitosan treatment could alleviate the damage of salt stress to waxy corn seedlings by increasing the content of osmotic substances, enhancing the activity of antioxidant enzymes and decreasing the content of malondialdehyde.
Keywords: Waxy Maize Seedling; Salt Stress; Chitosan Treatment; Enzyme Activity