A different sequence of events than previously reported leads to arsenic-induced damage in Ceratophyllum demersum L.

Mishra, Seema; Stärk, Hans-Joachim; Küpper, Hendrik

A different sequence of events than previously reported leads to arsenic-induced damage in Ceratophyllum demersum L.

Dateien

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Datum

2014

Autor:innen

Mishra, Seema

Stärk, Hans-Joachim

Küpper, Hendrik

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Biologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Metallomics. 2014, 6(3), pp. 444-454. ISSN 1756-5901. eISSN 1756-591X. Available under: doi: 10.1039/C3MT00317E

Zusammenfassung

Arsenic (As) is a common pollutant, and still many questions remain concerning As toxicity mechanisms under environmentally relevant conditions in plants. Here we investigated thresholds and interactions of various proposed As toxicity mechanisms. Experiments were done under environmentally pertinent conditions in the rootless aquatic macrophyte Ceratophyllum demersum L., a model for plant shoots. Arsenic (provided as As(V)) inhibited plant metabolism at much lower concentrations and with a different sequence of events than previously reported. The first observed effect of toxicity was a decrease in pigment concentration, it started even at 0.5 μM As. In contrast to toxic metals, no inhibition of the photosystem II reaction centre (PSIIRC; measured as F_v/F_m) was found at sublethal As concentrations. Instead, the decrease in light harvesting pigments caused a less efficient exciton transfer towards the PSIIRC. At higher As concentrations this led to increased non-photochemical quenching (NPQ) by light harvesting complex II (LHCII). Afterwards, photosynthetic electron transport decreased, but the increase in starch content indicated stronger inhibition of starch consumption than production. At lethal As concentration, photosynthesis was completely inhibited, its malfunction caused oxidative stress and not the other way round as reported previously. Photosynthesis was inhibited before any sign of oxidative stress was observed. Elevated phosphate drastically shifted thresholds of lethal As effects, not only by the known uptake competition but also by modifying uptake regulation and intracellular processes.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Zitieren

ISO 690

MISHRA, Seema, Hans-Joachim STÄRK, Hendrik KÜPPER, 2014. A different sequence of events than previously reported leads to arsenic-induced damage in Ceratophyllum demersum L.. In: Metallomics. 2014, 6(3), pp. 444-454. ISSN 1756-5901. eISSN 1756-591X. Available under: doi: 10.1039/C3MT00317E

BibTex

@article{Mishra2014-03diffe-26340,
  year={2014},
  doi={10.1039/C3MT00317E},
  title={A different sequence of events than previously reported leads to arsenic-induced damage in Ceratophyllum demersum L.},
  number={3},
  volume={6},
  issn={1756-5901},
  journal={Metallomics},
  pages={444--454},
  author={Mishra, Seema and Stärk, Hans-Joachim and Küpper, Hendrik}
}

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Universitätsbibliographie

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