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《Asian Journal of Ecotoxicology》 2008-04
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Effects of Cd Spiking on Cell Ultrastructure of Root and Leaf of Two Rice Cultivars

SHI Jing,PAN Gen-xing,LI Lian-qing Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095  
To examine the rice(Oryza sativa L.) genotypic difference in the alternation of cell ultrastructure and the toxicity position of cadmium(Cd)pollution on ultrastructure of different parts of cell, a pot experiment was conducted with two cultivars of hybrid rice, Zhongzheyou 1(high grain Cd accumulation) and J196(low grain Cd accumulation). Cd concentration of soil was 25mg·kg-1 spiked with reagent grade CdCl2·2.5H2O. Results showed that there was different Cd tolerance mechanism binding to cell wall or immobilization in vacuole between Zhongzheyou 1 and J196 through electronic microscopic observation. It appeared similar for both rice cultivars that chloroplasts and mitochondria were swelling up, and thylakoids vacuolized of ultrastructure of leaf causing by high concentration of Cd. But Cd aggravated the damage in the rice cultivar-J196, making mitochondrion mesenchyme dissolve and mitochondria be on the verge of disorganization. It was indicated that Cd tolerance on cell ultrastructure of Zhongzheyou 1 was higher than that on J196. It further demonstrated that mitochondria and chloroplast of rice mesophyll cells were the most sensitive organelles.
【Fund】: 博士点专项基金项目(No.B200613);; 科技部支撑计划项目(No.2006BAD17B06)
【CateGory Index】: X173
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