Crops ›› 2020, Vol. 36 ›› Issue (2): 168-171.doi: 10.16035/j.issn.1001-7283.2020.02.025

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Effects of Salicylic Acid on Physiological and Biochemical Characteristics of Wheat Seedling under Water Stress

Wang Hezheng,Shen Sihan,Zhang Dongxia,Wang Gaijing,Zheng Jinzhi,Bi Biao,Wang Wenjie   

  1. College of Agriculture, Henan University of Science and Technology, Luoyang 471023, Henan, China
  • Received:2019-08-02 Revised:2019-10-23 Online:2020-04-15 Published:2020-04-13

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Abstract:

In order to understand the protective mechanism of salicylic acid (SA) on wheat seedlings under water stress and to screen the optimal concentration for enhancing drought resistance of wheat seedlings, wheat cultivar Luohan 6 was used as material in this study. The effects of SA on the morphological and physiological indexes of wheat seedlings under 20% polyethylene glycol (PEG) stress were studied through hydroponic method. The results showed that the contents of soluble sugar, protein and amino acid, the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) under the PEG stress increased after spraying of SA while the contents of superoxide free radical (O2 —.), H2O2 and malondialdehyde decreased. It suggested the external application of SA could reduce the rate of reactive oxygen species production, reduce the degree of lipid peroxidation, maintain the stability of cell membrane and alleviate the inhibition of water stress on wheat seedling’s growth by improving osmotic adjustment ability and antioxidant enzyme activity. In this study, 0.6mmol/L SA was found to be best.

Key words: Wheat, Salicylic acid, Water stress, Physiological and biochemical characteristics

Fig.1

Effects of SA on root-shoot ratio of wheat seedlings under water stress Different letters indicate significantly different at P<0.05, the same below"

Fig.2

Effects of SA on contents of soluble sugar, protein and amino acid in wheat seedlings under water stress"

Fig.3

Effects of SA on contents of O2—., H2O2 and MDA in wheat seedlings under water stress"

Fig.4

Effects of SA on activities of SOD、POD and CAT in wheat seedlings under water stress"

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