Crops ›› 2017, Vol. 33 ›› Issue (5): 73-79.doi: 10.16035/j.issn.1001-7283.2017.05.013

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Response of Antioxidant System to Drought Stress in Sugar Beet Leaves at Seedling Stage

Li Guolong1,Sun Yaqing1,Shao Shiqin2,Zhang Yongfeng1   

  1. 1Agricultural College,Inner Mongolia Agricultural University,Hohhot 010018,Inner Mongolia,China
    2College of Life Sciences,Inner Mongolia Agricultural University,Hohhot 010018,Inner Mongolia,China
  • Received:2017-07-22 Revised:2017-08-16 Online:2017-10-15 Published:2018-08-26

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Abstract:

Two sugar beet cultivars HI0466 and KWS9454, different in drought resistance, were used to examine the response of antioxidant system to drought stress and the relationship for evaluating drought resistance during seedling stage under different drought conditions. The results showed that activities of protective enzymes SOD, POD, CAT and contents of GSH, AsA were increased significantly and then decreased significantly, however, carotenoids (Car) content decreased under drought stress. To resistant cultivar, the increase was more significant than the decrease, so the activities of SOD, POD and CAT and the contents of Car, AsA were higher, meanwhile, malondialdehyde (MDA) contents were lower under several treatments. There was significant difference between HI0466 and KWS9454. In addition, it was found that the activities of SOD, POD and contents of MDA, AsA could be used as effective indicators for the identification of drought resistance at seedling stage for sugar beet species by principal component analysis.

Key words: Sugar beet, Antioxidant system, Drought stress, Drought resistance

Fig.1

The change of SOD activity of sugar beet seedling leaves under different water conditions RW1, RW2 indicate re-water treatment of KWS9454, HI0466, respectively, the same below"

Fig.2

The change of POD activity of sugar beet seedling leaves under different water conditions"

Fig.3

The change of CAT activity of sugar beet seedling leaves under different water conditions"

Fig.4

The change of MDA content of sugar beet seedling leaves under different water conditions"

Fig.5

The change of H2O2 content of sugar beet seedling leaves under different water conditions"

Fig.6

The change of Car content of sugar beet seedling leaves under different water conditions"

Fig.7

The change of GSH content of sugar beet seedling leaves under different water conditions"

Fig.8

The change of AsA content of sugar beet seedling leaves under different water conditions"

Table 1

Eigenvectors and percentages of accumulated contribution of principal components"

生理指标
Physiological index		 成分1
Component 1		 成分2
Component 2
SOD活性SOD activity 0.977 0.425
POD活性POD activity 0.941 0.751
MDA含量MDA content 0.388 -0.972
CAT活性CAT activity 0.847 0.591
H2O2含量H2O2 content 0.718 -0.139
Car含量Car content -0.555 0.849
GSH含量GSH content 0.455 -0.089
AsA含量AsA content -0.232 0.917
特征值Eigen value 3.786 3.444
贡献率Contribution rate (%) 47.325 43.046
累计百分率Cumulative percentage (%) 47.325 90.372
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