Wang Xue, Liu Dongwu
School of Life Sciences, Shandong University of Technology, Zibo, Shandong, 255049, China.
Analysis and Testing Center, Shandong University of Technology, Zibo, 255049, China.
Environ Sci Pollut Res Int. 2017 Jul;24(19):16336-16343. doi: 10.1007/s11356-017-9274-0. Epub 2017 May 25.
Rare earth elements (REEs) accumulate in the soil and ecosystem. Cerium (Ce) is one of the main additives in REE-containing fertilizers. However, little information is available on Ce distribution patterns and chemical forms in rice. The subcellular distribution and chemical forms of Ce were investigated in the rice seedlings (Oryza sativa L., cv. Zhonghua 11) exposed to 0, 10, 20, 40, 80, and 160 μM Ce. The elongation of root and shoot was significantly inhibited by 20, 40, 80, and 160 μM Ce. Cerium was significantly accumulated in the cell walls, cell organelles, and soluble fractions of the roots and shoots with the increase of Ce concentrations. The concentrations of Ce in roots were significantly higher than shoots, and a large amount of Ce was stored in cell walls. In addition, Ce existed in the different chemical forms in the rice seedlings, and there were most insoluble oxalate or phosphate forms in roots. The subcellular distribution and chemical forms of Ce were closely associated with the metal tolerance and detoxification of rice.
稀土元素（REEs）在土壤和生态系统中积累。铈（Ce）是含稀土元素肥料中的主要添加剂之一。然而，关于水稻中铈的分布模式和化学形态的信息很少。研究了水稻幼苗（Oryza sativa L.，品种：中华11）在0、10、20、40、80和160 μM铈处理下铈的亚细胞分布和化学形态。20、40、80和160 μM铈显著抑制了根和茎的伸长。随着铈浓度的增加，铈在根和茎的细胞壁、细胞器和可溶性部分中显著积累。根中铈的浓度显著高于茎，大量铈储存在细胞壁中。此外，水稻幼苗中铈以不同的化学形态存在，根中大部分为不溶性草酸盐或磷酸盐形态。铈的亚细胞分布和化学形态与水稻的金属耐受性和解毒作用密切相关。
