Premium
Direct evidence showing the effect of root surface iron plaque on arsenite and arsenate uptake into rice ( Oryza sativa ) roots
Author(s) -
Chen Zheng,
Zhu YongGuan,
Liu WenJu,
Meharg Andy A.
Publication year - 2005
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2004.01241.x
Subject(s) - arsenate , arsenite , arsenic , oryza sativa , phosphate , chemistry , kinetics , biochemistry , botany , biology , physics , organic chemistry , quantum mechanics , gene
Summary• 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.