Liu Donghua, Zou Jin, Meng Qingmin, Zou Jinhua, Jiang Wusheng
Department of Biology, College of Chemistry and Life Sciences, Tianjin Normal University, Tianjin, 300387, People's Republic of China.
Ecotoxicology. 2009 Jan;18(1):134-43. doi: 10.1007/s10646-008-0266-1. Epub 2008 Sep 5.
The effects of different concentrations of Pb on growth of Allium sativum L, Pb uptake and accumulation, antioxidant enzyme activity and malondialdehyde content were investigated. The results indicated that shoot growth at high concentration of Pb (10(-3) M) and roots growth at 10(-3) M and 10(-4) M Pb were significantly inhibited. Lead ions were accumulated mainly in the roots and only small amounts were translocated to bulbs and shoots. SOD activities in shoot and roots exposed to 10(-3) M Pb were observed to be high. Plants exposed to 10(-3) M Pb showed a significant increase in POD activity in roots versus the control and other Pb treatments. In roots, CAT activity and MDA concentration at 10(-3) M Pb is high significantly. The mechanisms of Pb toxicity and tolerance in garlic are briefly discussed.
研究了不同浓度铅对大蒜生长、铅吸收与积累、抗氧化酶活性及丙二醛含量的影响。结果表明，高浓度铅（10⁻³ M）显著抑制地上部生长，10⁻³ M和10⁻⁴ M铅显著抑制根系生长。铅离子主要积累在根部，仅有少量转运至鳞茎和地上部。暴露于10⁻³ M铅的地上部和根系中超氧化物歧化酶（SOD）活性较高。与对照及其他铅处理相比，暴露于10⁻³ M铅的植株根系中过氧化物酶（POD）活性显著增加。在根系中，10⁻³ M铅处理下的过氧化氢酶（CAT）活性和丙二醛（MDA）浓度显著升高。文中简要讨论了大蒜中铅毒性及耐受性的机制。
