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