Thiol peptides induction in the seagrass Thalassia testudinum (Banks ex König) in response to cadmium exposure

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 CdCl 2 concentrations (0, 30, 50 and 70 μM). Levels of cadmium, cysteine, glutathione (GSH), γ-glutamylcyste...

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Bibliographic Details
Published in:Aquatic toxicology 2008-01, Vol.86 (1), p.12-19
Main Authors: Alvarez-Legorreta, Teresa, Mendoza-Cozatl, David, Moreno-Sanchez, Rafael, Gold-Bouchot, Gerardo
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
aquatic plants
bioaccumulation
Biological and medical sciences
Cadmium
Cadmium Chloride - metabolism
Cadmium Chloride - toxicity
Chromatography, High Pressure Liquid
Dose-Response Relationship, Drug
Ecotoxicology, biological effects of pollution
Fundamental and applied biological sciences. Psychology
General aspects
heavy metals
Hydrocharitaceae - chemistry
Hydrocharitaceae - drug effects
Marine
peptides
Phytochelatins
Plant Proteins - analysis
Plant Proteins - biosynthesis
Plant Structures - chemistry
plant tissues
Sea grass
Statistics, Nonparametric
Sulfhydryl Compounds - analysis
Sulfhydryl Compounds - metabolism
Thalassia testudinum
Thiol peptides
thiols
Time Factors
Tissue Distribution
translocation (plant physiology)
Water Pollutants, Chemical - metabolism
Water Pollutants, Chemical - toxicity
water pollution
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Summary: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 CdCl 2 concentrations (0, 30, 50 and 70 μM). Levels of cadmium, cysteine, glutathione (GSH), γ-glutamylcysteine (γ-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 γ-EC. This is the first report of induction of thiol peptides, presumably phytochelatins, by a trace metal in a sea grass species.
ISSN:0166-445X
1879-1514
DOI:10.1016/j.aquatox.2007.09.001