| Effect of NaCl on antioxidant enzyme activities and water status in cotton seedling under drought stress |
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| DOI：10.7606/j.issn.1000-7601.2018.06.15 |
| Key Words: NaCl drought stress cotton antioxidant enzymes water potential soil moisture |
| Author Name | Affiliation | | FENG Chun-xiao | School of Life Sciences, Ludong University, Yantai, Shandong 264025, China | | HAO Zhi-jun | Yantai Entry and Exit Inspection and Quarantine Bureau, Yantai, Shandong 264000, China | | GAO Jian-min | Yantai Entry and Exit Inspection and Quarantine Bureau, Yantai, Shandong 264000, China | | SUN Yan-lin | School of Life Sciences, Ludong University, Yantai, Shandong 264025, China | | BAI Xin-fu | School of Life Sciences, Ludong University, Yantai, Shandong 264025, China |
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| Abstract: |
| This study investigated the variation of antioxidant enzyme activity and the malondialdehyde (MDA) content in the seedlings under soil salinity and drought stress. Four levels of NaCl, 0, 50, 100, and 200 mmol·L-1 were carried out under drought stress. The results showed that the activities of superoxide dismutase (SOD), catalase (CAT), and total antioxidative capacity (T-AOC) of cotton seedlings significantly increased in the first 21 days with drought stress-only treatment, then, rapidly decreased with prolonged drought stress and peroxidase (POD) activity steadily increased throughout the seedling growth. In contrast, the variations of SOD, POD, CAT activities, and T-AOC in seedlings with prior treatments of 50, 100, and 200 mmol·L-1 NaCl were apparently lower than that in the drought treatment alone. The MDA content in leaves of cotton seedlings with drought treatment alone was significantly higher than that in the other salt treatments. This implied that salt treatment might alleviate the damages of drought stress on cotton seedlings. In addition, all salt treatments also showed improvement of water retention capacity in the pot soils, and increased the uptake and accumulation of Na+ in plants that resulted in decline in the osmotic potential of the leaves by 17.5%~40.1% compared with that in the plants with drought stress alone, which was favorable for the maintenance of a higher cell turgor and the mitigation of the adverse effects of drought stress in cotton. |
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