Cd Toxicity and Accumulation in Rice Plants Vary with Soil Nitrogen Status and Their Genotypic Difference can be Partly Attributed to Nitrogen Uptake Capacity

• Published in: Rice science Vol. 16; no. 4; pp. 283 - 291
• Main Authors: DU, Qin, CHEN, Ming-xue, ZHOU, Rong, CHAO, Zhao-yun, ZHU, Zhi-wei, SHAO, Guo-sheng, WANG, Guang-ming
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2009; College of Agronomy and Biotechnology, Southwest University, Chongqing 400715, China; China National Rice Research Institute, Hangzhou 310006, China%China National Rice Research Institute, Hangzhou 310006, China%College of Agronomy and Biotechnology, Southwest University, Chongqing 400715, China
• Subjects: cadmium; genotypic difference; nitrogen; nitrogen uptake capacity; rice ( Oryza sativa); tolerance; 吸收能力; 基因型差异; 氮素状况; 镉毒性; 镉积累; cadmium; nitrogen uptake capacity; genotypic difference; rice ( Oryza sativa); nitrogen; tolerance; rice (Oryza sativa)
• ISSN: 1672-6308; 1876-4762
• DOI: 10.1016/S1672-6308(08)60092-X

Two indica rice genotypes, viz. Milyang 46 and Zhenshan 97B differing in Cd accumulation and tolerance were used as materials in a hydroponic system consisting of four Cd levels （0, 0.1, 1.0 and 5.0 μmol/L） and three N levels （23.2, 116.0 and 232.0 mg/L） to study the effects of nitrogen status and nitrogen uptake capacity on Cd accumulation and tolerance in rice plants. N-efficient rice genotype, Zhenshan 97B, accumulated less Cd and showed higher Cd tolerance than N-inefficient rice genotype, Milyang 46. There was consistency between nitrogen uptake capacity and Cd tolerance in rice plants. Increase of N level in solution slightly increased Cd concentration in shoots but significantly increased in roots of both genotypes. Compared with the control at low N level, Cd tolerance in both rice genotypes could be significantly enhanced under normal N level, but no significant difference was observed between the Cd tolerances under normal N （116.0 mg/L） and high N （232.0 mg/L） conditions. The result proved that genotypic differences in Cd accumulation and toxicity could be, at least in part, attributed to N uptake capacity in rice plants.