Coordination and speciation of cadmium in corn seedlings and its effects on macro- and micronutrients uptake.
The effect of cadmium (Cd) on both the absorption of important nutrients and the synthesis of low molecular weight thiols (LMWTs) was investigated in corn plants. The inductively coupled plasma-optical emission spectroscopy results demonstrated that the concentration of Cd in tissues (mainly in roots) increased as the concentration in the medium increased. In addition, the concentration of phosphorus increased in roots of Cd treated plants but remained at normal concentration in shoots. On the other hand, the uptake of sulfur (S) followed a similar trend as the Cd uptake. The concentration of S and the production of LMWT were found to increase significantly upon exposure to Cd. The results of the X-ray absorption spectroscopy analyses indicated that Cd within tissues was bound to S ligands with interatomic distances of 2.51-2.52 A. These results confirm a strong linkage between S uptake and the production of LMWT upon exposure to Cd.
Castillo-Michel
Hiram A
HA
Department of Environmental Science and Engineering Ph.D. Program, The University of Texas at El Paso, 500 West University Avenue, El Paso, TX 79968-0513, USA.
Hernandez
Nahum
N
Martinez-Martinez
Alejandro
A
Parsons
Jason G
JG
Peralta-Videa
Jose R
JR
Gardea-Torresdey
Jorge L
JL
D001692:Biological Transport; D002104:Cadmium / Q000494:pharmacology*; D018548:Cotyledon / Q000378:metabolism; D003545:Cysteine / Q000096:biosynthesis; D005978:Glutathione / Q000096:biosynthesis; D008345:Manganese / Q000378:metabolism; D018977:Micronutrients / Q000378:metabolism*; D008982:Molybdenum / Q000378:metabolism; D010758:Phosphorus / Q000378:metabolism*; D054811:Phytochelatins / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism; D018520:Plant Shoots / Q000378:metabolism; D036226:Seedlings / Q000378:metabolism; D013052:Spectrometry, X-Ray Emission; D013438:Sulfhydryl Compounds / Q000378:metabolism*; D013455:Sulfur / Q000378:metabolism*; D003313:Zea mays / Q000187:drug effects* / Q000378:metabolism
D018977:Micronutrients; D013438:Sulfhydryl Compounds; D002104:Cadmium; D010758:Phosphorus; D008345:Manganese; D013455:Sulfur; D008982:Molybdenum; D054811:Phytochelatins; D005978:Glutathione; D003545:Cysteine