State Key Laboratory of Food Science and Technology, School of Environment and Civil Engineering, Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, Jiangsu Province, China.
Jiangsu Cooperative Innovation Center of Water Treatment Technology and Materials, Suzhou University of Science and Technology, Suzhou, Jiangsu Province, China.
PLoS One. 2018 May 15;13(5):e0197365. doi: 10.1371/journal.pone.0197365. eCollection 2018.
REEs in the environment can be absorbed by plants and sequestered by plant phytoliths. Acid rain can directly or indirectly affect plant physiological functions. Currently, the effects of REEs and acid rain on phytolith-REEs complex in plants are not yet fully understood. In this study, a high-silicon accumulation crop, rice (Oryza sativa L.), was selected as a representative of plants, and orthogonal experiments were conducted under various levels of lanthanum [La(III)] and pH. The results showed that various La(III) concentrations could significantly improve the efficiency and sequestration of phytolith La(III) in germinated rice seeds. A pH of 4.5 promoted phytolith La(III) sequestration, while a pH of 3.5 inhibited sequestration. Compared with the single treatment with La(III), the combination of La(III) and acid rain inhibited the efficiency and sequestration of phytolith La(III). Correlation analysis showed that the efficiency of phytolith La(III) sequestration had no correlation with the production of phytolith but was closely correlated with the sequestration of phytolith La(III) and the physiological changes of germinated rice seeds. Phytolith morphology was an important factor affecting phytolith La(III) sequestration in germinated rice seeds, and the effect of tubes on sequestration was more significant than that of dumbbells. This study demonstrated that the formation of the phytolith and La(III) complex could be affected by exogenous La(III) and acid rain in germinated rice seeds.
REEs 在环境中可以被植物吸收，并被植物的植硅体固定。酸雨可以直接或间接地影响植物的生理功能。目前，REEs 和酸雨对植物中植硅体-REEs 复合物的影响尚未完全了解。在这项研究中，选择了一种高硅积累作物——水稻（Oryza sativa L.）作为植物的代表，在不同的镧 [La(III)] 和 pH 值水平下进行正交实验。结果表明，各种 La(III)浓度可以显著提高萌发水稻种子中植硅体 La(III)的效率和固定。pH 值为 4.5 促进了植硅体 La(III)的固定，而 pH 值为 3.5 则抑制了固定。与 La(III)的单一处理相比，La(III)和酸雨的组合抑制了植硅体 La(III)的效率和固定。相关分析表明，植硅体 La(III)固定效率与植硅体的产生无关，而是与植硅体 La(III)的固定和萌发水稻种子的生理变化密切相关。植硅体形态是影响萌发水稻种子中植硅体 La(III)固定的重要因素，管对固定的影响比哑铃型更显著。本研究表明，外源 La(III)和酸雨可以影响萌发水稻种子中植硅体和 La(III)复合物的形成。
