Thiol peptides induction in the seagrass Thalassia testudinum (Banks ex Konig) in response to cadmium exposure
Periodo de realización: 0001/01/01 al 2008/01/01
Tipo: Artículo científico
Lugar(es) de estudio: Quintana Roo, México
Resumen: "Trace metal accumulation and thiol compounds synthesis as induced by cadmium exposure was studied in the seagrass Thalassia testudinum.
Shoots were exposed for 24, 48, 96 and 144 h to several CdCl2 concentrations (0, 30, 50 and 70 M). Levels of cadmium, cysteine, glutathione
(GSH), -glutamylcysteine (-EC), and phytochelatin-like peptides were determined in green blades, live sheaths and root/rhizomes tissues. Metal
accumulation was dependent on Cd concentration and type of tissue, with green blades showing the highest content followed by live sheaths and
root/rhizomes. All tissues experienced an increase in thiol-containing compounds as a response to cadmium exposure. Live sheaths showed the
highest levels of cysteine, GSH and -EC. This is the first report of induction of thiol peptides, presumably phytochelatins, by a trace metal in a
sea grass species."