摘要
为向水体污染的植物修复技术提供依据,采用营养液水培法研究5个阿特拉津浓度(1、2、4、8和16 mg L-1)下千屈菜鲜重增量、叶片相对含水量(RWC)、丙二醛(MDA)含量、过氧化物酶(POD)活性、根系活力和叶绿素含量等的变化差异.结果表明,阿特拉津胁迫下,千屈菜在实验浓度范围内均可存活和生长;但鲜重增量、RWC、叶绿素含量均有不同程度的下降,根系活力和POD活性降低,同时MDA含量上升,膜脂过氧化程度加剧.阿特拉津浓度越高,其对千屈菜的毒性越高.1 mg L-1处理下,除POD活性外植物其他生长和生理指标均与空白对照无显著差异;但16 mgL-1处理下,鲜重增量、MDA含量和POD活性则显著低于正常水平.由于阿特拉津的降解,这种不良影响随处理时间的延长而减弱.千屈菜对低浓度阿特拉津(≤1 mg L-1)具有较高耐受性.
Phytotoxicity of atrazine residue in water to Lythrum salicaria, an emerging aquatic macrophyte species, was assessed with hydroponic experiments by examining the impacts of atrazine stress on peroxidase （POD） activity, root activity, malonaldehyde （MDA） content, chlorophyll content, relative water content （RWC） and fresh weight of the sampled plants. The original atrazine dosages in the culture solutions were 1, 2, 4, 8 and 16 mg L^-1, respectively. The plants were exposed to atrazine for 60 days. Plant samples were collected at the 15th, 30th, 45th and 60th days, respectively, after the onset of the experiment. The results showed that the plants all survived, but POD activity, root activity, chlorophyll content, RWC and increment of fresh weight were declined under the atrazine treatments except for MDA content. It was also found that the phytotoxic effects attenuated as atrazine decompounded. 1 mg L^-1 atrazine treatment had no significant effect on the parameters except for POD activity during the experiment, suggesting that the species be less sensitive to atrazine with low concentration. Fig 2, Tab 1, Ref 31
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2011年第6期814-818,共5页
Chinese Journal of Applied and Environmental Biology
基金
北京市科技新星计划项目(No.2006B03)资助~~
