Yan Chong Ling, Lin Peng, Wang Xiao Rong
School of Life Sciences, Xiamen University, Xiamen 361005.
Shi Yan Sheng Wu Xue Bao. 2002 Sep;35(3):169-72.
Pot experiment was used to study the responses of membrane protection enzyme system of tobacco leaves on Hg, Cd and Pb stresses in soil. The results showed that POD activity gradually increased with increasing concetrations of Hg, Cd and Pb. CAT and SOD activity gradually decreased under three heavy metals common existing and SOD variation curve showed unimodal curve under single or two elements existing with increase of concentration of Hg, Cd and Pb. The effects of Hg, Cd and Pb in soil: three elemets together > two elements together > single element only. The effects resulted in an imbalance--activated oxygen produce and scavenge and physiological biochemical process disorder. There was a synergistic action for the effect of Hg, Cd and Pb in soil on membrane protection enzyme system in tobacco leaves.
采用盆栽试验研究了土壤中汞、镉、铅胁迫下烟草叶片膜保护酶系统的响应。结果表明，随着汞、镉、铅浓度的增加，过氧化物酶（POD）活性逐渐升高。在三种重金属共存时，过氧化氢酶（CAT）和超氧化物歧化酶（SOD）活性逐渐降低，在单一或两种元素存在时，随着汞、镉、铅浓度的增加，SOD变化曲线呈单峰曲线。土壤中汞、镉、铅的影响：三种元素共存＞两种元素共存＞单一元素。这些影响导致了活性氧产生与清除的失衡以及生理生化过程紊乱。土壤中汞、镉、铅对烟草叶片膜保护酶系统的影响存在协同作用。
