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Effects of cadmium, zinc and nitrogen status on non-protein thiols in the macroalgae enteromorpha spp. from the Scheldt estuary (SW Netherlands, Belgium) and Thermaikos Gulf (n Aegean Sea, Greece)
Malea, P.; Rijstenbil, J.W.; Haritonidis, S. (2006). Effects of cadmium, zinc and nitrogen status on non-protein thiols in the macroalgae enteromorpha spp. from the Scheldt estuary (SW Netherlands, Belgium) and Thermaikos Gulf (n Aegean Sea, Greece). Mar. Environ. Res. 62(1): 45-60. dx.doi.org/10.1016/j.marenvres.2006.03.002
In: Marine Environmental Research. Applied Science Publishers: Barking. ISSN 0141-1136; e-ISSN 1879-0291, meer
Peer reviewed article  
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Trefwoorden
    Algae
    Chemical elements > Metals > Heavy metals > Cadmium
    Chemical elements > Metals > Heavy metals > Zinc
    Chemical elements > Nonmetals > Atmospheric gases > Nitrogen
    MED, Greece, Thermaikos Gulf
    Ulva Linnaeus, 1753 [WoRMS]
    Thermaikos Gulf [Marine Regions]
    Brak water; Zoet water
Author keywords
    cadmium; Enteromorpha; glutathione; macroalgae; phytochelatins; zinc
Auteurs  Top 
  • Malea, P.
  • Rijstenbil, J.W., meer
  • Haritonidis, S.
Abstract
    Enteromorpha prolifera (Scheldt Estuary) and E. linza (Thermaikos Gulf) were incubated at three salinities with 100 and 200 µg L-1Cd and Zn. The objective was to measure effects of Cd, Zn and nitrogen (N) status on the pools of metal-binding non-protein thiols: glutathione and phytochelatins, (?-glutamyl-cysteinyl)n-glycine (PC). In E. linza, ammonium pools were higher, but amino acid pools, total N and protein contents were lower than in E. prolifera. Reduced glutathione (GSH) pools were positively correlated with free glutamate and protein contents. In E. linza GSH pools increased and the ratio of reduced to oxidized glutathione (GSH:(GSH + 0.5GSSG)), an indicator of oxidative stress, decreased with Cd contents, indicating Cd-induced glutathione oxidation. Total glutathione pools (reduced plus oxidized) ranged from 16 nmol S gdwt-1 in controls (at 0.5 µmol Cd gdwt-1) to 179 nmol S gdwt-1 (at 1.9 µmol Cd gdwt-1) at the highest cadmium dosage. Cadmium stimulated PC synthesis in E. prolifera which suggests that in N-rich algae, glutathione pools were high enough for PC synthesis. In both species GSH and protein increased with Zn contents, whereas GSH:(GSH + 0.5GSSG) decreased, which would indicate Zn-induced oxidative stress; in E. linza, at the highest salinity the glutathione redox ratio decreased from 0.61 (at 2.9 µmol Zn gdwt-1) to 0.26 (at 4.9 nmol S gdwt-1) (at 0.5 mol Cd gdwt-1). PCs were not synthesized in response to Zn, which may have resulted in Zn-induced GSH oxidation. The presence of both oxidative effects (Cd, Zn) and detoxification (Cd) could be identified by observing the responses of glutathione and PC pools to metal stress.
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