Crops ›› 2022, Vol. 38 ›› Issue (1): 130-136.doi: 10.16035/j.issn.1001-7283.2022.01.019

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Effects of Different Neutral Salt Stress on Photosynthesis and Antioxidant Enzyme System of Sugar Beet Seedlings

Cai Qiqi1(), Wang Gang1, Dong Yinzhuang1, Yu Lihua2, Wang Yuguang2, Geng Gui1,2()   

  1. 1College of Life Sciences, Heilongjiang University, Harbin 150080, Heilongjiang, China
    2College of Advanced Agriculture and Ecological Environment, Heilongjiang University, Harbin 150080, Heilongjiang, China
  • Received:2021-03-22 Revised:2021-05-05 Online:2022-02-15 Published:2022-02-16
  • Contact: Geng Gui E-mail:caiqiqi199701@163.com;genggui01@163.com

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Abstract:

In order to explore the differences in the harm of sugar beet stressed by different types of neutral salt, two neutral salts (NaCl and Na2SO4) and their mixed salts (NaCl:Na2SO4=2:1) were selected to treat sugar beet seedlings under moderate stress (140mmol/L Na+) and severe stress (280mmol/L Na+), and the difference in the effects of the two kinds of neutral salt stress on the photosynthesis and antioxidant enzyme system of sugar beet was analyzed. The changes in photosynthetic pigment content, photosynthetic parameters and antioxidant enzyme activities of sugar beet seedlings treated with different neutral salts were analyzed. The result showed that the photosynthetic pigment content and photosynthesis related indexes of sugar beet seedlings under neutral salt stress decreased compared with the control group, decrease range was Na2SO4 > mixed salt > NaCl, and the Na2SO4 treatment was more severely affected. It was found that the antioxidant enzyme activity of sugar beet increased under salt stress compared with the control group, the rising range was Na2SO4 > mixed salt > NaCl, and the change of Na2SO4 treatment group was more obvious. It was finally determined that the toxic effect of Na2SO4 on sugar beet seedlings was far greater than that of NaCl. This study provide a theoretical basis for the selection, planting and production layout of sugar beet in different saline-alkali regions.

Key words: Neutral salt stress, Sugar beet, Photosynthesis, Antioxidant enzyme system

Table 1

The amount of NaCl and Na2SO4 added in different treatments mmol/L"

处理Treatment Na+ NaCl Na2SO4
不加盐No salt（CK） 0 0 0
NaCl 140 140 0
280 280 0
Na2SO4 140 0 70
280 0 140
混合盐Mixed salt 140 70 35
（NaCl:Na2SO4=2:1） 280 140 70

Fig.1

The effects of different neutral salt treatments on the dry weight per plant and leaf area of sugar beet seedlings Different lowercase letters indicate significant difference at P < 0.05 level, the same below"

Fig.2

Effects of different neutral salt treatments on the contents of Chl, Chl a, Chl b and Caro of leaves of sugar beet seedlings"

Fig.3

Effects of different neutral salt treatments on Pn, Tr, Gs and Ci of sugar beet seedlings"

Fig.4

Changes of relative conductivity and MDA content in leaves under salt stress of different concentrations"

Fig.5

The changes in SOD, APX, CAT and POD activities of sugar beet treated with different neutral salts"

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