中文摘要：

以大蒜为材料，研究不同酸度（pH4．5和pH5．8）的铝溶液对蒜苗根系的氧化损伤和遗传损伤．结果表明，经10umol／L～1000umol／L的铝处理后，大蒜根系抗氧化酶SOD、POD、CAT活性改变，pH4．5的铝组酶活性呈诱导性增高，而pH5．8时高浓度组酶活与对照接近，其余铝组酶活性降低，但pH4．5和pH5．8的铝处理均能使细胞MDA含量增加．5umol／L～100umol／L的铝处理能导致大蒜根尖微核细胞率增加，且显著增加的铝浓度在pH4．5时较低．研究结果表明，铝对植物细胞具有遗传损伤作用，可能与铝胁迫引起的氧化损伤有关，环境酸度增强能加重铝对植物的毒害．

英文摘要：

Genotoxicity and oxidative damage of aluminum （A1） on plant cells was studied in Allium sativum L. root cells at pH 5. 8 and pH 4. 5, respectively. Exposure to 10 umol/L to 1 000 umol/L aluminum trichloride solution containing 100 umol/L Ca^2＋, activities of superoxide dismutase （SOD）, peroxidase （POD） and catalase （CAT） increased significantly in plant roots at pH 4. 5, but enzymes activities decreased at pH 5. 8 except in higher concentration treatment groups. However, A1 treatments both at pH 4. 5 and pH 5. 8 caused marked increases in MDA contents in root cells. Furthermore,Al treatments induced micronucleus formation in the range of 5 to 100umol/L,and higher toxicity occurred in pH 4.5 groups than those in pH 5.8 groups. Our results indicate that aluminum trichloride is a genotoxic agent in plant cells,and its toxicity is enhanced at low pH value. Our results suggest that the genoxicity may result from the oxidative stress by Al.