| 冯春晓,郝志军,高健民,孙燕琳,柏新富.干旱胁迫下NaCl对棉花幼苗抗氧化酶活性及水分特征的影响[J].干旱地区农业研究,2018,36(6):98~103 |
| 干旱胁迫下NaCl对棉花幼苗抗氧化酶活性及水分特征的影响 |
| 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 |
| 中文关键词: NaCl 干旱胁迫 棉花 抗氧化酶 水势 土壤水分 |
| 英文关键词:NaCl drought stress cotton antioxidant enzymes water potential soil moisture |
| 基金项目:国家自然科学基金项目（31601994） |
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| 摘要点击次数: 1050 |
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| 中文摘要: |
| 测定干旱与0、50、100和200 mmol·L-1 NaCl组合条件下棉花叶片抗氧化酶活性和丙二醛（MDA）含量的变化，分析土壤盐分对棉花耐旱性的影响。结果表明，单一干旱处理的棉花幼苗SOD、CAT活性和总抗氧化力在处理后的前21d大幅升高随后又快速下降，POD活性则持续升高，而50~200 mmol·L-1 NaCl溶液浇灌的盆栽棉花幼苗在干旱期间SOD、POD、CAT活性和总抗氧化力的变幅明显小于单一干旱；同时，单一干旱棉花幼苗叶片MDA含量明显高于前者，说明NaCl溶液浇灌土壤减弱了干旱胁迫对棉花幼苗的伤害程度。另外，盆土用50~200 mmol·L-1 NaCl溶液浇灌后显著提高了土壤的保水能力，增加了植株对Na+的吸收和积累，使叶片渗透势比单一干旱降低了17.5%~40.1%，从而有利于维持较高的细胞膨压，缓解干旱胁迫对棉花的不利影响。 |
| 英文摘要: |
| 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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