| Autor: |
Bao G; Key Laboratory of Groundwater Resources and Environment of the Ministry of Education, College of New Energy and Environment, Jilin University, Changchun 130023, China; and Corresponding author. Email: baogz@jlu.edu.cn., Tang W; Key Laboratory of Groundwater Resources and Environment of the Ministry of Education, College of New Energy and Environment, Jilin University, Changchun 130023, China., He F; Key Laboratory of Groundwater Resources and Environment of the Ministry of Education, College of New Energy and Environment, Jilin University, Changchun 130023, China., Chen W; Key Laboratory of Groundwater Resources and Environment of the Ministry of Education, College of New Energy and Environment, Jilin University, Changchun 130023, China., Zhu Y; Key Laboratory of Groundwater Resources and Environment of the Ministry of Education, College of New Energy and Environment, Jilin University, Changchun 130023, China., Fan C; The Administration of Jingyu Water Conservation, Jingyu, Jilin Province 135200, China., Zhang M; Key Laboratory of Groundwater Resources and Environment of the Ministry of Education, College of New Energy and Environment, Jilin University, Changchun 130023, China., Chang Y; Key Laboratory of Groundwater Resources and Environment of the Ministry of Education, College of New Energy and Environment, Jilin University, Changchun 130023, China., Sun J; Key Laboratory of Groundwater Resources and Environment of the Ministry of Education, College of New Energy and Environment, Jilin University, Changchun 130023, China., Ding X; College of Animal Science, Jilin University, Changchun 130023, China. |
| Abstrakt: |
Freeze-thaw (FT) in northern China is a common event in spring and autumn, and the release of sulfur dioxide from coal-burning in winter is apt to trigger acid precipitation. Both these stresses can aggravate the wintering ability of white clover (Trifolium repens L.). Acid precipitation and FT simulation experiments were carried out in the field and an indoor alternation refrigerator, respectively. The contents of soluble protein, soluble sugar, malondialdehyde (MDA), proline and antioxidant activity were tested under acid precipitation and FT stress. The results showed that under acid precipitation stress, the content of MDA, peroxidase and superoxide dismutase increased in both leaves and stolons, whereas soluble protein and soluble sugar content declined compared with the control groups. During the freezing period, the content of antioxidant enzyme activity, soluble protein and proline increased at first and then dropped, whereas MDA and soluble sugar content both increased. As a conclusion, the stolon of white clover is more sensitive than the leaf to short-term stress, either as the single FT stress or the combined stress of FT and acid precipitation, suggesting that maintaining more leaves can contribute to the resistance of white clover to these stresses. |
