Effect of Cd Stress in Soil on Activity of Membrane Lipid Peroxidation and Protective Enzymes in Seedlings of Four Northern Broadleaved Tree Species
An experiment was conducted to study the influence of soil Cd pollution stress on the activity of peroxidation membrane lipid and protective enzymes in seedlings in pot of four northern broadleaved tree species, Acer mono Maxim, Malus bacata Borkh, Pyrus ussuriensis Maxim and Acer ginnala Maxim. A gradient with different Cd contents was created by mixing various quantity of Cd( Cl)2 · 2.5H2O with the same weight of soil. The seedling leaves of different species were determined after growing for 75 days. Results show that chlorophyll concentration and chlorophyll a/b ratio decrease, MDA concentration and POD activity increase with increasing Cd concentration in soil, and the activity of SOD increase at a low Cd concentration and decrease with Cd concentration increasing. The variations of all these indexes (except for relative conductivity) in Acer mono and Pyrus ussuriensis are greater than those in Malus bacata and Acer ginnala. Acer ginnala and Malus bacata show higher tolerance to soil Cd pollution stress, thereby, they are preferable to be employed as ornamental trees within urban environments polluted by Cd.
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NSTL
万方数据
维普
