| S-异丙甲草胺与镉对斜生栅藻光合作用的影响 |
| 摘要点击 2789 全文点击 1442 投稿时间：2014-02-18 修订日期：2014-03-31 |
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| 中文关键词 S-异丙甲草胺 镉 斜生栅藻 叶绿素含量 叶绿素荧光 |
| 英文关键词 S-metolachlor cadmium Scenedesmus obliquus chlorophyll content chlorophyll fluorescence |
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| 中文摘要 |
| 采用毒性试验标准方法研究了Cd2+与S-异丙甲草胺单独及联合作用对斜生栅藻叶绿素含量及叶绿素荧光特性的影响. 暴露96 h后，Cd2+和S-异丙甲草胺单独作用对斜生栅藻叶绿素含量和叶绿素荧光参数F0、Fv/Fm、Fv/F0、Y（Ⅱ）、qP、NPQ和rETR均有一定影响，表明Cd2+和S-异丙甲草胺对斜生栅藻光合作用产生影响，PSⅡ受损，抑制光合作用的原初反应，阻碍光合电子传递的过程，对热能的耗散能力逐渐丧失. Cd2+对斜生栅藻叶绿素含量和叶绿素荧光参数影响要显著大于S-异丙甲草胺的影响，影响程度随有毒物质浓度的升高而增加，光强为231 μmol ·（m2 ·s）-1时，空白组Y（Ⅱ）的平均降幅为62.5%，Cd2+处理组随Cd2+浓度的升高平均降幅分别为68.0%、82.5%和100%，S-异丙甲草胺处理组平均降幅分别为66.1%、72.1%和79.6%. Cd2+与S-异丙甲草胺联合作用对叶绿素荧光参数的影响主要是Cd2+的影响. |
| 英文摘要 |
| The single and combined effects of Cd2+ and S-metolachlor on the chlorophyll content and chlorophyll fluorescence parameters of Scenedesmus obliquus were studied by using standard toxic testing method. Both Cd2+ and S-metolachlor had effects on the chlorophyll content and fluorescence parameters such as F0, Fv/Fm, Fv/F0, Y(Ⅱ), qP, NPQ and rETR after 96 h-exposure, showing that Cd2+ and S-metolachlor damaged the PSⅡ in algae, inhibited the primary reaction of photosynthesis, stopped the process of photosynthetic electron transport, and destroyed its ability of heat dissipation. The effects of Cd2+ on the chlorophyll content and fluorescence parameters were greater than those of S-metolachlor, and the effects increased with the increasing concentration. The average drop of Y(Ⅱ) was 62.5% in the control group when the light intensity was 231 μmol ·(m2 ·s)-1, and it was 68.0%, 82.5% and 100% respectively in Cd2+-treated groups, and 66.1%, 72.1% and 79.6% respectively in S-metolachlor-treated group with the increasing concentration. The combined effects of Cd2+ and S-metolachlor on the chlorophyll fluorescence parameters were mainly due to the impacts of Cd2+. |
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