| 伊朗Zanjan城市尾矿土壤中入侵植物的抗氧化能力和金属积累情况 |
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| 作者姓名： | M. M. A. BOOJAR Z. TAVAKKOLI |
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| 作者单位： | Department of Biology;Tarbiat Moalem University; |
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| 基金项目： | Supported by the Tarbiat Moallem University,Iran |
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| 摘 要： | Tailings of a Pb and Zn mine as a metal-contaminated area (Zone 1) with two pioneer plant species, Peganum harmala and Zygophyllum fabago, were investigated and compared with a non-contaminated area (Zone 2) in the vicinity. Total concentrations of Pb, Zn, and Cu in the soil of Zone 1 were 1 416, 2 217, and 426 mg kg-1 , respectively, and all exceeded their ranges in the normal soils. The soil pH was in the neutral range and most of the physical and chemical characteristics of the soils from both zones were almost similar. The species Z. fabago accumulated higher Cu and Zn in its aerial part and roots than the normal plants. On the other hand, their concentrations did not reach the criteria that the species could be considered as a metal hyperaccumulator. The species P. harmala did not absorb metals in its roots; accordingly, the accumulation factor values of these metals were lower than 1. The contents of chlorophyll, biomass, malondialdehyde, and dityrosine in these two species did not vary significantly between the two zones studied. In Zone 1, leaf vacuoles of Z. fabago stored 35.6% and 43.2% of the total leaf Cu and Zn, respectively. However, in this species, the levels of phytochelatins (PCs) and glutathione (GSH) and antioxidant enzyme activities were significantly higher in Zone 1 than in Zone 2. In conclusion, metal exclusion in P. harmala and metal accumulation in Z. fabago were the basic strategies in the two studied pioneer species growing on the metal-contaminated zone. In response to metal stress, elevation in antioxidant enzyme activities, increases in the PCs and GSH levels in the aerial parts, and metal storage within vacuoles counteracted each other in the invasion mechanism of Z. fabago.
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| 关 键 词： | accumulation factor antioxidant enzymes glutathione metal stress phytochelatins |
| 收稿时间： | 8 January 2011 |
Antioxidative responses and metal accumulation in invasive plant species growing on mine tailings in Zanjan, Iran |
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| M. M. A. BOOJAR,Z. TAVAKKOLI.Antioxidative responses and metal accumulation in invasive plant species growing on mine tailings in Zanjan, Iran[J].Pedosphere,2011,21(6):802-812. |
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| Authors: | M M A BOOJAR and Z TAVAKKOLI |
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| Institution: | Department of Biology, University of Tarbiat Moalem, No. 49. Dr. Mofateh Avenue, Tehran, P.O. Box 15614 (Iran);'Department of Biology, University of Tarbiat Moalem, No. 49. Dr. Mofateh Avenue, Tehran, P.O. Box 15614 (Iran) |
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| Abstract: | Tailings of a Pb and Zn mine as a metal contaminated area (Zone 1) with two pioneer plant species, Peganum harmala and Zygophyllum fabago, were investigated and compared with a non-contaminated area (Zone 2) in the vicinity. Total concentrations of Pb, Zn, and Cu in the soil of Zone 1 were 1 416, 2 217, and 426 mg kg-1 DW, respectively, and all exceeded their ranges in the normal soils. The soil pH was in the neutral range and most of the physical and chemical characteristics of the soils from both zones were almost similar. The species Z. fabago accumulated higher Cu and Zn in its aerial part and roots than the normal plants. On the other hand, their concentrations did not reach the criteria that the species could be considered as a metal hyperaccumulator. The species P. harmala did not absorb metals in its roots; accordingly the accumulation factor of these metals were lower than 1. The contents of chlorophyll, biomass, malondialdehyde, and dityrosine in these two species did not vary significantly between the two zones studied. In Zone 1, leaf vacuoles of Z. fabago stored 35.6% and 43.2% of the total leaf Cu and Zn, respectively. However, in this species, the levels of phytochelatins (PCs) and glutathione (GSH) and antioxidant enzyme activities were significantly higher in Zone 1 than in Zone 2. In conclusion, metal exclusion in P. harmala and metal accumulation in Z. fabago were the basic strategies in the two studied pioneer species growing on the metal-contaminated zone. In response to metal stress, elevation in antioxidant enzyme activities, increases in the PCs and GSH levels in the aerial parts, and metal storage within vacuoles counteracted each other in the invasion mechanism of Z. fabago. |
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| Keywords: | accumulation factor antioxidant enzymes glutathione metal stress phytochelatins |
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