| 刘小文1,2，齐成媚1，梁剑3，李园2，王秋霞2，郭美霞2，刘晓燕2，曹坳程2*.重金属铅、镉污染下紫茎泽兰对氨氯吡啶酸的耐性[J].植物保护,2013,39(6):32-36. |
| 重金属铅、镉污染下紫茎泽兰对氨氯吡啶酸的耐性 |
| Picloram tolerance of Ageratina adenophorum under Pb/Cd stress |
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| DOI： |
| 中文关键词: 铅 镉 紫茎泽兰 氨氯吡啶酸 耐药性 |
| 英文关键词:Pb Cd Ageratina adenophorum picloram tolerance |
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| 中文摘要: |
| 研究了在重金属Pb、Cd污染土壤下，紫茎泽兰对氨氯吡啶酸的耐药性。结果表明，低剂量氨氯吡啶酸处理下，其鲜重防效随Pb浓度的升高显著增加，高剂量则呈先升后降的变化趋势；各处理IC50均小于对照，以500 mg/kg处理时为最低；低剂量氨氯吡啶酸处理时，紫茎泽兰鲜重防效随Cd浓度的增加显著增加，120 g/hm2氨氯吡啶酸处理时则随Cd浓度的增加呈下降趋势，各处理IC50均小于对照，以100 mg/kg处理组为最低；≤ 60 g/hm2氨氯吡啶酸处理时，Pb-Cd复合污染胁迫组的鲜重防效均小于单一Pb、Cd处理组，高于对照，120 g/hm2氨氯吡啶酸处理时，Pb-Cd复合污染胁迫组却高于单一Cd处理组和对照，接近单一Pb处理组，其IC50均高于单一Pb、Cd处理组。证实重金属Pb、Cd污染下，紫茎泽兰对氨氯吡啶酸的耐药性明显下降，鲜重防效显著提高，根系也受到一定程度的抑制，这对我国西南地区尤其是Pb、Cd污染严重地区紫茎泽兰的防治起到积极作用。 |
| 英文摘要: |
| The picloram tolerance of Ageratina adenophorum under Pb/Cd pollution stress was studied. The results showed that the preventive efficacy of A.adenophorum fresh weight (PE) was significantly increased as the Pb concentration ascended at low concentration of picloram. When Pb concentration was high, the efficacy ascended first and then descended. Picloram IC50 values in all Pb treatments were smaller than those in the control, especially under 500 mg/kg Pb stress. PE significantly increased following the increase of Cd concentration at low picloram concentration. PE was significantly decreased, however, as the Pb concentration was 120 g(ai)/hm2 picloram. Picloram IC50 values in all Cd treatments were lower than those in the control, while it is the lowest when the Cd concentration was 100 mg/kg. PE under combined Pb-Cd pollution stress was smaller than that treated with Pb or Cd alone, but higher than that of the control when picloram concentration was ≤ 60 g(ai)/hm2. PE under Pb-Cd combined pollution stress was higher than that of Cd alone or the control when treated with 120 g(ai)/hm2 picloram and close to that treated with Pb. Picloram IC50 under Pb-Cd was higher than that under Pb or Cd alone. The results demonstrated that picloram tolerance of E.adenophorum decreased significantly under Pb or Cd soil, but PE was significantly increased, and the root system of E.adenophorum were inhibited to a certain extent. This work would play a positive role in controlling A.adenophorum at Pb or Cd polluted sites in southwestern China. |
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