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《Chinese Journal of Rice Science》 2016-04
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Changes in Cadmium Concentration in Rice Plants Under Different Cadmium Levels and Expression Analysis of Genes Retated to Cadmium Regulation

ZHOU Quan;WANG Hong;ZHANG Ying-xin;DONG Qing;MENG Shuai;CAO Li-yong;SHAO Guo-sheng;SHEN Xi-hong;China National Rice Research Institute;  
Using six indica and six japonica cultivars,differed in cadmium concentrations in the above-ground parts,the growth,heavy metal contents and expression levels of heavy metal transporter related genes were studied in a hydroponic experiment at six cadmium levels.Cadmium stress reduced plant height,shoot dry weight and chlorophyll content in rice leaves,inhibiting rice growth.Significant difference in cadmium content in rice roots and shoots among rice cultivars were found under different cadmium treatments,and the results showed that root-to-shoot translocation may be a key process that determine the difference in cadmium contents between rice cultivars and subspecies,while cadmium absorption by roots had little effect.At various cadmium levels(from 0.50 to 2.00 mg/kg),saturation of cadmium accumulation in rice shoots were found in some cultivars that cadmium content stopped increasing or even decreased.Besides,the expression levels of OsNRMAP1,OsIRT2 and OsNAS2 were significantly increased at such cadmium treatment,which might be attributed to the regulation of rice plants.
【Fund】: 公益性行业(农业)科研专项(201403015);; 国家自然科学基金资助项目(31571616);; 中国农业科学院(协同)创新工程资助项目;; 国家863计划资助项目(2014AA10A603-15)
【CateGory Index】: S511
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