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| Effects of selenium fertilization on cadmium uptake and transport in rice crop in different cadmiumcontaminated soils during two consecutive seasons |
| Received:August 03, 2022 |
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| KeyWord:paddy soil;cadmium;selenium;current season rice;subsequent season rice;transfer coefficient |
| Author Name | Affiliation | E-mail | | ZHOU Jingheng | Institute of Subtropical Agriculture, Chinese Academy of Sciences, Key Laboratory of Agro-Ecological Processes in Subtropical Region, Changsha 410125, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | ZHANG Quan | Institute of Subtropical Agriculture, Chinese Academy of Sciences, Key Laboratory of Agro-Ecological Processes in Subtropical Region, Changsha 410125, China | | | LIU Bo | Institute of Subtropical Agriculture, Chinese Academy of Sciences, Key Laboratory of Agro-Ecological Processes in Subtropical Region, Changsha 410125, China | | | MA Tianchi | Institute of Subtropical Agriculture, Chinese Academy of Sciences, Key Laboratory of Agro-Ecological Processes in Subtropical Region, Changsha 410125, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | HUANG Daoyou | Institute of Subtropical Agriculture, Chinese Academy of Sciences, Key Laboratory of Agro-Ecological Processes in Subtropical Region, Changsha 410125, China | | | ZHU Qihong | Institute of Subtropical Agriculture, Chinese Academy of Sciences, Key Laboratory of Agro-Ecological Processes in Subtropical Region, Changsha 410125, China | | | XU Chao | Institute of Subtropical Agriculture, Chinese Academy of Sciences, Key Laboratory of Agro-Ecological Processes in Subtropical Region, Changsha 410125, China | | | ZHU Hanhua | Institute of Subtropical Agriculture, Chinese Academy of Sciences, Key Laboratory of Agro-Ecological Processes in Subtropical Region, Changsha 410125, China | hhzhu@isa.ac.cn |
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| Abstract: |
| A pot experiment, with four rates of selenium（Se）concentration（0.5, 1.0, 2.0 mg · kg-1 and 4.0 mg · kg-1）, was conducted to investigate the effects of Se fertilization on the absorption and transport mechanisms of cadmium（Cd）in rice during two consecutive seasons under moderately and severely Cd contaminated soils. The Cd and Se contents in rice plant tissues were determined. The results showed that the Cd content of the current season rice grain decreased by 28.6% only when Se dose was 2.0 mg·kg-1 under moderately Cd contaminated paddy soil. However, the Cd content of rice under severely Cd polluted soil decreased by 36.1% only when the dose of Se was 1.0 mg · kg-1. The Cd content of rice grains of the subsequent season significantly decreased by 30.9% - 50.7% in each Se treatment. Application of 1.0 mg·kg-1 and 2.0 mg·kg-1 Se in the current season rice significantly reduced the transfer coefficient of Cd from roots to shoots by 21.5%-28.3%, with no significant effect on Cd transport in the rice crop during the subsequent season. The Se content in all parts of rice plants under moderately and severely Cd contaminated soils during the current and subsequent seasons increased with Se application rate. With the increase of Se content, the Cd enrichment coefficient of rice grain significantly decreased when the natural logarithm was used. When the Se dose was 0.5 mg·kg-1 in moderately Cd contaminated soil and ≤1.0 mg·kg-1 in severely Cd contaminated soil, the Se content in rice of the current and the subsequent seasons was less than 1.0 mg·kg-1. Therefore, Se application can effectively reduce the Cd content in subsequent rice by reducing Cd uptake by the rice crop, but the appropriate Se application level still needs to be confirmed under field conditions. |
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