| 摘要: |
| 研究了外源一氧化氮对Pb2+1000 mg/L胁迫下高羊茅生长及无机离子含量变化的影响。结果表明,与对照相比,单用Pb2+胁迫使高羊茅鲜重、干重、含水量、根系活力和无机离子如NO</sup>-3、K+、Na+、Ca2+、Mg2+和Mn2+含量均下降,而其根的丙二醛含量和质膜透性、Pb2+含量均上升; 与单用Pb2+胁迫相比,用SNP(Sodium Nitroprusside,NO供体)0.01～1 mmol/L处理Pb2+胁迫下高羊茅,其鲜重、干重、含水量、根系活力、无机离子如NO</sup>-3、K+、Na+、Ca2+、Mg2+和Mn2+含量呈先上升后下降的变化趋势,而根的丙二醛含量和质膜透性、Pb2+含量呈相反的变化趋势。综合结果表明,外源NO对Pb2+胁迫下高羊茅生长影响具有剂量效应,适宜浓度能缓解铅毒害,提高耐铅性。 |
| 关键词: 高羊茅 一氧化氮 Pb2+胁迫 无机离子 生长 |
| DOI： |
| 分类号:Q945 |
| Fund project: |
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| Effect of exogenous NO on the growth and inorganic ion content of Festuca arundinacea seedlings under Pb2+ stress |
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ZHANG Yuan-Bing, LIU Ai-Rong, ZHANG Xue-Ping, HUANG Shou-Cheng
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College of Life Science, Anhui Science and Technology University, Fengyang 233100, China
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| Abstract: |
| Effects of exogenous nitric oxide(NO)on the growth and some inorganic ions changes of Festuca arundinacea seedlings under Pb2+ stress(1 000 mg/L)were investigated. The result showed that:in comparison with the control,Pb2+ stress decreased the fresh weight,dry weight,water content,the root activity,inorganic ions contents such as NO</sup>-3,K+,Na+,Ca2+,Mg2+and Mn2+,but increased the root MDA content,the root membrane permeability and Pb2+content of F.arundinacea seedlings. In comparison with Pb2+ stress,SNP 0.01-1 mmol/L made the fresh weight,dry weight,water content,the root activity,the inorganic ions contents of the seedlings under Pb2+ stress increase first and then decline,and the root MDA content,the root membrane permeability and Pb2+ content changed in the opposite direction. The results suggested that there was the dose effect of exogenous NO on the seedlings growth under Pb2+ stress,suitable concentration of NO could matigate lead poison and enhance the lead tolerance of F.arundinacea seedlings. |
| Key words: Festuca arundinacea NO Pb2+ stress inorganic ions growth |
