Details zur Publikation
Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1111/nph.13840
Titel (primär) Cadmium toxicity investigated at the physiological and biophysical levels under environmentally relevant conditions using the aquatic model plant Ceratophyllum demersum
Autor Andresen, E.; Kappel, S.; Stärk, H.-J.; Riegger, U.; Borovec, J.; Mattusch, J.; Heinz, A.; Schmelzer, C.E.H.; Matoušková, Š.; Dickinson, B.; Küpper, H.
Quelle New Phytologist
Erscheinungsjahr 2016
Department ANA
Band/Volume 210
Heft 4
Seite von 1244
Seite bis 1258
Sprache englisch
Supplements https://nph.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1111%2Fnph.13840&file=nph13840-sup-0001-SupInfo.pdf
https://nph.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1111%2Fnph.13840&file=nph13840-sup-0002-TableS1.xlsx
Keywords cadmium (Cd); Ceratophyllum demersum ; environmentally relevant; light-harvesting complexes (LHCs); macrophyte; toxic metals; toxicity
UFZ Querschnittsthemen RU2;
Abstract
  • Cadmium (Cd) is an important environmental pollutant and is poisonous to most organisms. We aimed to unravel the mechanisms of Cd toxicity in the model water plant Ceratophyllum demersum exposed to low (nM) concentrations of Cd as are present in nature.
  • Experiments were conducted under environmentally relevant conditions, including nature-like light and temperature cycles, and a low biomass to water ratio. We measured chlorophyll (Chl) fluorescence kinetics, oxygen exchange, the concentrations of reactive oxygen species and pigments, metal binding to proteins, and the accumulation of starch and metals.
  • The inhibition threshold concentration for most parameters was 20 nM. Below this concentration, hardly any stress symptoms were observed. The first site of inhibition was photosynthetic light reactions (the maximal quantum yield of photosystem II (PSII) reaction centre measured as Fv/Fm, light-acclimated PSII activity ΦPSII, and total Chl). Trimers of the PSII light-harvesting complexes (LHCIIs) decreased more than LHC monomers and detection of Cd in the monomers suggested replacement of magnesium (Mg) by Cd in the Chl molecules. As a consequence of dysfunctional photosynthesis and energy dissipation, reactive oxygen species (superoxide and hydrogen peroxide) appeared.
  • Cadmium had negative effects on macrophytes at much lower concentrations than reported previously, emphasizing the importance of studies applying environmentally relevant conditions. A chain of inhibition events could be established.
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=17932
Andresen, E., Kappel, S., Stärk, H.-J., Riegger, U., Borovec, J., Mattusch, J., Heinz, A., Schmelzer, C.E.H., Matoušková, Š., Dickinson, B., Küpper, H. (2016):
Cadmium toxicity investigated at the physiological and biophysical levels under environmentally relevant conditions using the aquatic model plant Ceratophyllum demersum
New Phytol. 210 (4), 1244 - 1258 10.1111/nph.13840