| Characteristics of protective enzyme activities and lipid peroxidation in broomcorn millet leaves under soil water stress |
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| DOI：10.7606/j.issn.1000-7601.2019.01.28 |
| Key Words: broomcorn millet (panicummiliaceum L.) water stress grain yield protective enzyme activity membrane lipid peroxidation |
| Author Name | Affiliation | | FENG Xiao-min | Institute of Crop Sciences, Chinese Academy of Agricultural Sciences /Key Laboratory of Crop Physiology and Ecology, Ministry of Agriculture, Beijing 100081, China
College of Life Science, Shanxi Normal University, Linfen, Shanxi 041004, China | | ZHANG Yong-qing | College of Life Science, Shanxi Normal University, Linfen, Shanxi 041004, China
College of Geographical Sciences, Shanxi Normal University, Linfen, Shanxi 041004, China |
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| Abstract: |
| To evaluate the effects of soil water stress on the yield of broomcorn millet, activities of endogenous enzymes, membrane protective system, and membrane lipid peroxidation of leaves in broomcorn millet, two different drought tolerance broomcorn millet varieties were used for a pot trial with rain-protection shed and artificial water control system. The results showed that spikes, grains per spike, and thousand-kernel weight decreased compared with CK and significantly decreased at P<0.05 under severe water stress (SS) treatment. The activities of SOD, POD, and CAT in broomcorn millet leaves increased first and then decreased throughout the growth period with a peak at the heading stage. Meanwhile, the activities of SOD, POD, and CAT decreased under water stress. Significant differences were observed under severe water stress compared to the control group at P<0.05 level. For example, the activity of SOD of drought-tolerant variety (Longmi 4) decreased by 22.58% on average within two years under severe water stress, while that of the drought-sensitive variety (Jinshu 7) decreased by 44.94% on average within two years. However, the contents of MDA and soluble sugar of broomcorn millets were increased by water stress. The soluble sugar content increased first and then decreased throughout the growth period, and peaked at the filling stage. The correlation analysis indicated that the yield of broomcorn millets was positively correlated with chlorophyll content, SOD activity, POD activity, and CAT activity. This study provided an important evidence why Longmi 4 can survive better than Jinshu 7 under conditions of drought stress. |
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