Abstract：A hydroponic culture experiment was conducted to investigate the uptake and transfer factor (TF) of zinc (Zn) by different plant species, the translocation and the redistribution of Zn in the cell wall and its’ components were also studied. The results showed that the Zn uptake and its translocation differed significantly between six cultivars, the largest shoot Zn concentrations were found in Chinese cabbage and lettuce, while rice had the largest Zn concentration in root. With the addition of 50mg/L Zn in solution, the shoot to root transfer factors of Zn by plant species followed: Chinese cabbage ≈ leaf mustard ≈ lettuce>sweet green pepper > tomato > rice, however, the TF of lettuce exceeded the leaf mustard under the lower addition concentration (20mg/LZn), it’s probably related with the hormesis of Zn phyto-toxicity to lettuce. The Zn immobilization by cell wall was an important mechanism for Zn detoxification. By the in-situ desorption technique, the Zn accumulation in cell walls and their components were measured. The result showed that the Zn contents of cell walls increased significantly after removing pectin among plant species, the largest increment of 53.7% was found with rice while the least (21.1%) with sweet green pepper. The result of adsorption kinetics of Zn on the root cell walls indicated the adsorption of Zn by raw cell walls and treated cell walls was a fast reaction, more than 91% of total Zn was adsorbed by the adsorbents within 30min, the adsorption maximum of Zn by cell walls increased significantly after removing pectin among plant species, on the contrary, the adsorption maximum of Zn by cell walls decreased remarkably after removing pectin and hemicellulose, especially with the cell walls of rice. The results indicated that the hemicellulose components in cell walls played an important role in bonding Zn and thereafter reducing the translocation of Zn in xylem in plants.
陈世宝, 孙聪, 魏威, 林蕾, 王萌. 根细胞壁及其组分差异对植物吸附、转运Zn的影响[J]. 中国环境科学, 2012, 32(9): 1670-1676.
CHEN Shi-Bao, SUN Cong, WEI Wei, LIN Lei, WANG Meng. Difference in cell wall components of roots and its effect on the transfer factor of Zn by plant species. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(9): 1670-1676.
