Cd Toxicity and Accumulation in Rice Plants Vary with Soil Nitrogen Status and Their Genotypic Difference can be Partly Attributed to Nitrogen Uptake Capacity |
| |
| Authors: | DU Qin CHEN Ming-xue ZHOU Rong CHAO Zhao-yun ZHU Zhi-wei SHAO Guo-sheng WANG Guang-ming |
| |
| Institution: | [1]College of Agronomy and Biotechnology, Southwest University, Chongqing 400715, China [2]China National Rice Research Institute, Hangzhou 310006, China |
| |
| Abstract: | 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. |
| |
| Keywords: | rice (Oryza sativa) nitrogen cadmium genotypic difference nitrogen uptake capacity tolerance |
| 本文献已被 维普 万方数据 ScienceDirect 等数据库收录！ |
|
