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| Screening and human health risk assessment of rice varieties with cadmium/lead low accumulation |
| Received:August 09, 2024 |
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| KeyWord:rice;variety selection;heavy metal;low accumulation;risk assessment |
| Author Name | Affiliation | E-mail | | CHEN Ting | Key Laboratory of Plant Physiology and Developmental Regulation in Guizhou Province, Guizhou Normal University, Guiyang 550001, China
Key Laboratory of Biodiversity Conservation in Southwest Karst Mountains, State Forestry Administration, Guizhou Normal University, Guiyang 550001, China
College of Life Sciences, Guizhou Normal University, Guiyang 550001, China | | | LONG Shenglou | Key Laboratory of Plant Physiology and Developmental Regulation in Guizhou Province, Guizhou Normal University, Guiyang 550001, China
Key Laboratory of Biodiversity Conservation in Southwest Karst Mountains, State Forestry Administration, Guizhou Normal University, Guiyang 550001, China
College of Life Sciences, Guizhou Normal University, Guiyang 550001, China | | | SUN Yuanyuan | Key Laboratory of Plant Physiology and Developmental Regulation in Guizhou Province, Guizhou Normal University, Guiyang 550001, China
Key Laboratory of Biodiversity Conservation in Southwest Karst Mountains, State Forestry Administration, Guizhou Normal University, Guiyang 550001, China
College of Life Sciences, Guizhou Normal University, Guiyang 550001, China | sunyuanyuan@gznu.edu.cn | | ZHONG Lin | Key Laboratory of Plant Physiology and Developmental Regulation in Guizhou Province, Guizhou Normal University, Guiyang 550001, China
Key Laboratory of Biodiversity Conservation in Southwest Karst Mountains, State Forestry Administration, Guizhou Normal University, Guiyang 550001, China
College of Life Sciences, Guizhou Normal University, Guiyang 550001, China | | | SHANG Chengmei | Key Laboratory of Plant Physiology and Developmental Regulation in Guizhou Province, Guizhou Normal University, Guiyang 550001, China
Key Laboratory of Biodiversity Conservation in Southwest Karst Mountains, State Forestry Administration, Guizhou Normal University, Guiyang 550001, China
College of Life Sciences, Guizhou Normal University, Guiyang 550001, China | | | TANG Ming | Key Laboratory of Plant Physiology and Developmental Regulation in Guizhou Province, Guizhou Normal University, Guiyang 550001, China
Key Laboratory of Biodiversity Conservation in Southwest Karst Mountains, State Forestry Administration, Guizhou Normal University, Guiyang 550001, China
College of Life Sciences, Guizhou Normal University, Guiyang 550001, China | | | QIN Fanxin | Key Laboratory of Plant Physiology and Developmental Regulation in Guizhou Province, Guizhou Normal University, Guiyang 550001, China
Key Laboratory of Biodiversity Conservation in Southwest Karst Mountains, State Forestry Administration, Guizhou Normal University, Guiyang 550001, China
College of Life Sciences, Guizhou Normal University, Guiyang 550001, China | |
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| Abstract: |
| This study endeavors to identify rice cultivars that demonstrate high yield alongside low accumulation of cadmium（Cd）and lead （Pb）when cultivated in mildly contaminated farmland. Additionally, it assesses the potential human health risks associated with the consumption of brown rice grown under such conditions. A field plot experiment was conducted to investigate the variations in heavy metal absorption and accumulation among 20 different rice varieties（R01~R20）. The results demonstrated that the concentration of Cd in various components of the rice varieties followed this sequence：stems and leaves > brown rice >rice husk. In contrast, the concentration of Pb was ranked as follows：stems and leaves >rice husk > brown rice. Notably, the Cd content in brown rice from 13 varieties and the Pb content from 19 varieties conformed to the national safety standard of 0.2 mg · kg-1. Significant variations in the translocation factor（TF）and bioconcentration factor（BCF）of Cd and Pb were observed among the different rice varieties. The transfer coefficient for Cd showed a higher value for the TF of stems and leaves compared to the TF of stems, leaves, and husk, while the opposite trend was noted for Pb. The maximum concentration of Cd in the stems and leaves of the tested plants was found to be 5.34 times greater than the minimum concentration, whereas the concentration of Pb was 21.77 times higher. In the stems and husks, the maximum concentration of Cd was 4.27 times that of the minimum concentration, while the maximum concentration of Pb was 9.67 times greater. The maximum enrichment factor for Cd was 39 times its minimum value, while Pb exhibited an increase of 119 times. Furthermore, rice demonstrated a greater capacity to transfer and accumulate Cd compared to Pb. Cluster analysis of Cd and Pb content in relation to rice yield revealed that Baixiangyou 005 （R02）is a high-yielding variety characterized by low accumulation of both Cd and Pb. The findings from the single-factor pollution index （Pi） and total target hazard quotient（TTHQ）reveal that Cd is the predominant contributor to heavy metal pollution in the study area, posing significant health risks associated with the consumption of locally brown rice. Therefore, Baixiangyou 005 is strongly recommended for selection and cultivation. |
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