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Acta Prataculturae Sinica ›› 2021, Vol. 30 ›› Issue (7): 157-166.DOI: 10.11686/cyxb2020249

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Damage to the AsA-GSH cycle of soybean leaves under waterlogging stress at in seed filling period growth stages and the mitigation effect of uniconazole

Shi-ya WANG1(), Dian-feng ZHENG2(), Nai-jie FENG2(), Xi-long LIANG1,3, Hong-tao XIANG4, Sheng-jie FENG1, Xin-xin WANG1, Guan-qiang ZUO1   

  1. 1.College of Agriculture,Heilongjiang Bayi Agriculture University,Daqing 163319,China
    2.College of Coastal Agricultural Sciences,Guangdong Ocean University,Zhanjiang 524088,China
    3.Plant Growth Regulator Engineering Research Center,Heilongjiang Bayi Agriculture University,Daqing 163319,China
    4.Institute of Crop Cultivation and Tillage,Heilongjiang Academy of Agricultural Sciences,Harbin 150086,China
  • Received:2020-05-27 Revised:2020-08-10 Online:2021-07-20 Published:2021-06-03
  • Contact: Dian-feng ZHENG,Nai-jie FENG

Abstract:

This research explored the effect of spraying uniconazole (S3307) on two different soybean varieties under waterlogging stress. The waterlogging-tolerant variety Kenfeng 14 and the waterlogging-sensitive variety Kenfeng 16 were studied in pot experiments. The degree of membrane lipid peroxidation as indicated by malondialdehyde (MDA) concentration, and levels of reactive oxygen species (ROS) and peptide ascorbic acid-glutathione (AsA-GSH) in soybean leaves under waterlogging stress at growth stage R5 (seed filling period) were evaluated. AsA-GSH circulatory system damage was detected and S3307 had an alleviating effect. The results showed that waterlogging stress at the R5 growth stage significantly increased the MDA content in the leaves of the two tested soybean varieties and accelerated the accumulation of ROS. A greater increase was observed in the waterlogging-sensitive variety Kenfeng 16 than in Kenfeng 14. After foliar spraying with S3307, the concentration of non-enzyme antioxidants and the activities of key enzymes were increased, and the MDA concentration of leaves was reduced. S3307 inhibited the accumulation of ROS, reduced the damage caused by waterlogging stress to the membrane system, and assisted the maintenance of a high level of key enzyme activity and non-enzymatic antioxidant concentrations. The benefits of S3307 application persisted after plants were returned to normal soil water levels, S3307 and promoted the recovery of the two soybean varieties to a normal growth status. The recovery ability of waterlogging-tolerant variety Kenfeng 14 was better than Kenfeng 16. In summary, waterlogging stress had contrast effects on the AsA-GSH cycle in the leaves of two soybean varieties with different waterlogging tolerances. S3307 partially alleviated the damage caused by the waterlogging stress.

Key words: soybean, waterlogging stress, leaf, uniconazole, AsA-GSH cycle