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| Effect of exogenous lanthanum and silicon on the biosequestration ability of lanthanum by phytoliths in rice seedlings |
| Received:March 15, 2018 |
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| KeyWord:rice;lanthanum;silicon;phytolith;phytLa |
| Author Name | Affiliation | E-mail | | SI Yong | School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China
College of Resources Environment and Tourism Management, West Anhui University, Lu'an 237012, China | | | WANG Li-hong | School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China | | | ZHOU Qing | School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China
Jiangsu Cooperative Innovation Center of Technology and Materials for Water Treatment, Suzhou University of Science and Technology, Suzhou 215009, China | qingzhou510@yahoo.com |
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| Abstract: |
| Rare earth elements (REEs) in the environment enter plant tissues through the plant's roots, after which they can be sequestrated by phytoliths in plants. Silicon (Si) can affect the formation of plant phytoliths. Currently, the effects of REEs and Si on the sequestration ability of lanthanum[La (Ⅲ)] by the phytoliths (PLSA) in plants are not yet fully understood. In this study, rice (Oryza sativa L.) was selected as a representative of plants, and orthogonal experiments were set up under various concentrations of La (Ⅲ) and Si. Phytoliths were extracted from different parts of rice seedlings (roots, stems, and leaves) via the microwave digestion method, and the effects of exogenous La (Ⅲ) on the PLSA of different rice organs were revealed by using inductively coupled plasma atomic emission spectrometry and quantitative real-time PCR. The results showed that a low concentration of La (Ⅲ) increased the size of dumbbell phytoliths in leaves and the expression level of Lsi1 in roots and promoted the PLSA in roots and leaves. Meanwhile, a high concentration of La (Ⅲ) decreased the size of dumbbell phytoliths in leaves and the expression levels of Lsi1 and Lsi2 in roots and inhibited the PLSA in roots, stems, and leaves. Exogenous La (Ⅲ) was an important factor for promoting the sequestration efficiency of La (Ⅲ) by phytoliths in leaves, stems, and roots. Compared to the single treatment with La (Ⅲ), the combined treatment with La (Ⅲ) and Si promoted the PLSA in leaves and stems significantly and exogenous Si alleviated the inhibitory effects of a high concentration of La (Ⅲ) on the PLSA of leaves, roots, and stems. This study demonstrated that different concentrations of exogenous La (Ⅲ) and Si could change the PLSA in different organs of rice seedlings. |
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