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Metallomics Vol - 6 Issue - 2

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

Content Provider	Royal Society of Chemistry (RSC)
Author	Stärk, Hans-Joachim Mishra, Seema Küpper, Hendrik
Copyright Year	2014
Abstract	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 Fv/Fm) 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.
Starting Page	444
Ending Page	454
Page Count	11
File Format	HTM / HTML PDF
ISSN	17565901
Volume Number	6
Issue Number	3
Journal	Metallomics
DOI	10.1039/c3mt00317e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Photosynthetic reaction centre Ceratophyllum demersum Oxidative stress Exciton Macrophyte Starch Non-photochemical quenching Photosystem II Metabolism Light-harvesting complex Pigment Phosphate Photosynthesis
Content Type	Text
Resource Type	Article
Subject	Chemistry Medicine Metals and Alloys Biochemistry Biomaterials Biophysics

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