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| Cadmium accumulation in different rice cultivars from cadmium-polluted paddy fields |
| Received:May 09, 2019 |
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| KeyWord:farmland;rice cultivar;brown rice;cadmium;screening |
| Author Name | Affiliation | E-mail | | XUE Tao | Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
Key Laboratory of Land Surface Pattern and Simulation, Chinese Academy of Sciences, Beijing 100101, China
College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | LIAO Xiao-yong | Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
Key Laboratory of Land Surface Pattern and Simulation, Chinese Academy of Sciences, Beijing 100101, China | liaoxy@igsnrr.ac.cn | | WANG Ling-qing | Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
Key Laboratory of Land Surface Pattern and Simulation, Chinese Academy of Sciences, Beijing 100101, China | | | ZHANG Yang-zhu | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | zhangyangzhu2006@163.com |
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| Abstract: |
| In this study, rice cultivars that accumulated low levels of Cd were selected to reduce Cd content in rice and ensure the security of food production. The physiological growth and yield of 8 early-and 10 late-cultivars were studied to find those with low Cd accumulation and compare their differences based on a paddy field plot experiment. The results showed significant differences in pH value and available Cd content in the rhizosphere of the different cultivars. In addition, there were significant correlations among the pH values, available Cd content in rhizosphere, and the Cd content in rice. This demonstrated that a decrease in rhizosphere pH and an increase in available Cd content resulted in an increase in Cd content in rice. Based on the Cd content and rice yield, some rice cultivars were recommended as low Cd accumulation cultivars for fields moderately to slightly contaminated with Cd, including early cultivars ZJZ17, ZLY189, and H1s/R039 and late cultivars CLY772, CLY1419, and CLY051. Of these, the Cd content in the brown rice of early-cultivar ZLY189 was 0.09 mg·kg-1 and that in the late-cultivars CLY772 and CLY051 was approximately 0.085 mg·kg-1, which are both lower than the maximum allowable levels of Cd in food in China (0.2 mg·kg-1). This study thus showed that it is practical to select rice cultivars that accumulated low levels of Cd and are adapted to moderately to slightly Cd-contaminated paddy fields based on the differences in the Cd accumulation characteristics of the former. This provides a basis for food production on farmland contaminated with heavy metals. |
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