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Cell wall composition affects Cd2+ accumulation and intracellular thiol peptides in marine red algae
García-Ríos, V.; Freile-Pelegrín, Y.; Robledo, D.; Mendoza-Cózatl, D.; Moreno-Sánchez, R.; Gold-Bouchot, G. (2007). Cell wall composition affects Cd2+ accumulation and intracellular thiol peptides in marine red algae. Aquat. Toxicol. 81(1): 65-72. http://dx.doi.org/10.1016/j.aquatox.2006.11.001
In: Aquatic Toxicology. Elsevier Science: Tokyo; New York; London; Amsterdam. ISSN 0166-445X; e-ISSN 1879-1514, meer
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoorden
    Algae
    Cell constituents > Cell walls
    Chemical compounds > Cadmium compounds
    Chemical compounds > Organic compounds > Carbohydrates > Saccharides > Polysaccharides
    Chemical reactions > Photochemical reactions > Photosynthesis
    Composition
    Chondrophycus poiteaui (J.V.Lamouroux) K.W.Nam, 1999 [WoRMS]; Gracilaria cornea J.Agardh, 1852 [WoRMS]
    Marien/Kust
Author keywords
    red macroalgae; cadmium accumulation; photosynthesis; phytochelatins;polysaccharides; cell wall composition
Auteurs  Top 
  • García-Ríos, V.
  • Freile-Pelegrín, Y.
  • Robledo, D.
  • Mendoza-Cózatl, D.
  • Moreno-Sánchez, R.
  • Gold-Bouchot, G.
Abstract
    Two red macroalgae species, Gracilaria cornea and Chondrophycus poiteaui, were evaluated for their intra and extracellular Cd2+ accumulation capacity, photosynthetic response and thiol peptide production. Algae were exposed for 3 and 7 days to 0.1 and 1 μg CdCl2 ml−1 (0.89 and 8.9 μM). Intracellular accumulation of Cd2+ by G. cornea was relatively low, only comprising 20% of total metal (intracellular + extracellular). In contrast, C. poiteaui accumulated intracellularly close to 100% of total Cd2+. In both species, metal uptake was dependent on the external Cd2+ concentration, metal exposure time and cell wall composition. In response to Cd2+ exposure, low amounts of thiol peptides were synthesized and the major difference between G. cornea and C. poiteaui was in the cell wall composition. The absence of insoluble polysaccharides in the cell wall of C. poiteaui suggested that this insoluble fraction might be involved in establishing an efficient barrier for the intracellular accumulation of Cd2+. This is the first study in which the cell wall composition, its influence on Cd2+ accumulation and intracellular responses in red macroalgae are evaluated.
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