Direct evidence showing the effect of root surface iron plaque on arsenite and arsenate uptake into rice (Oryza sativa) roots
Direct evidence showing the effect of root surface iron plaque on arsenite and arsenate uptake into rice (Oryza sativa) roots
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DOI：
10.1111/j.1469-8137.2004.01241.x
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发表时间：
2005-01-01
期刊：
影响因子：
9.4
通讯作者：
Meharg, AA
中科院分区：
文献类型：
--
作者：
Chen, Z;Zhu, YG;Meharg, AA
本研究旨在探讨根表面铁膜对水稻离体根系对亚砷酸盐和砷酸盐吸收动力学的影响。结果表明，铁斑块的存在增强了亚砷酸盐的吸收，减少了亚砷酸盐的吸收。在没有斑块的情况下，亚砷酸盐和砷酸盐的摄取动力学充分符合Michaelis-Menten函数，但在有斑块的情况下，对该函数的拟合性较差。无论铁斑块是否存在，摄取溶液中的磷酸盐对亚砷酸盐的摄取没有显著影响；然而，磷酸盐对砷酸盐的吸收有显著影响。没有铁斑块，磷酸盐抑制砷酸盐摄取。铁斑块的存在减弱了磷酸盐对砷酸盐摄取的影响，可能是通过铁斑块对砷酸盐解吸的综合作用。
The present study aimed to investigate the effects of root surface iron plaque on the uptake kinetics of arsenite and arsenate by excised roots of rice (Oryza sativa) seedlings.The results demonstrated that the presence of iron plaque enhanced arsenite and decreased arsenate uptake.Arsenite and arsenate uptake kinetics were adequately fitted by the Michaelis-Menten function in the absence of plaque, but produced poor fits to this function in the presence of plaque.Phosphate in the uptake solution did not have a significant effect on arsenite uptake irrespective of the presence of iron plaque; however phosphate had a significant effect on arsenate uptake. Without iron plaque, phosphate inhibited arsenate uptake. The presence of iron plaque diminished the effect of phosphate on arsenate uptake, possibly through a combined effect of arsenate desorption from iron plaque.