KOPS - Das Institutionelle Repositorium der Universität Konstanz

Complexation and Toxicity of Copper in Higher Plants : I. Characterization of Copper Accumulation, Speciation, and Toxicity in Crassula helmsii as a New Copper Accumulator

Complexation and Toxicity of Copper in Higher Plants : I. Characterization of Copper Accumulation, Speciation, and Toxicity in Crassula helmsii as a New Copper Accumulator

Zitieren

Dateien zu dieser Ressource

Dateien Größe Format Anzeige

Zu diesem Dokument gibt es keine Dateien.

KÜPPER, Hendrik, Birgit GÖTZ, Ana MIJOVILOVICH, Frithjof Christian KÜPPER, Wolfram MEYER-KLAUCKE, 2009. Complexation and Toxicity of Copper in Higher Plants : I. Characterization of Copper Accumulation, Speciation, and Toxicity in Crassula helmsii as a New Copper Accumulator. In: Plant Physiology. 151(2), pp. 702-714. ISSN 0032-0889. eISSN 1532-2548

@article{Kupper2009Compl-1274, title={Complexation and Toxicity of Copper in Higher Plants : I. Characterization of Copper Accumulation, Speciation, and Toxicity in Crassula helmsii as a New Copper Accumulator}, year={2009}, number={2}, volume={151}, issn={0032-0889}, journal={Plant Physiology}, pages={702--714}, author={Küpper, Hendrik and Götz, Birgit and Mijovilovich, Ana and Küpper, Frithjof Christian and Meyer-Klaucke, Wolfram} }

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/1274"> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-23T09:07:34Z</dcterms:available> <dc:creator>Mijovilovich, Ana</dc:creator> <dc:contributor>Mijovilovich, Ana</dc:contributor> <dc:rights>deposit-license</dc:rights> <dc:creator>Meyer-Klaucke, Wolfram</dc:creator> <dcterms:issued>2009</dcterms:issued> <dc:contributor>Meyer-Klaucke, Wolfram</dc:contributor> <dc:contributor>Götz, Birgit</dc:contributor> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-23T09:07:34Z</dc:date> <dcterms:rights rdf:resource="http://nbn-resolving.org/urn:nbn:de:bsz:352-20140905103416863-3868037-7"/> <dc:language>eng</dc:language> <dcterms:title>Complexation and Toxicity of Copper in Higher Plants : I. Characterization of Copper Accumulation, Speciation, and Toxicity in Crassula helmsii as a New Copper Accumulator</dcterms:title> <dc:creator>Küpper, Frithjof Christian</dc:creator> <dcterms:abstract xml:lang="eng">The amphibious water plant Crassula helmsii is an invasive copper (Cu)-tolerant neophyte in Europe. It now turned out to accumulate Cu up to more than 9,000 ppm in its shoots at 10 µM (=0.6 ppm) Cu2+ in the nutrient solution, indicating that it is a Cu hyperaccumulator. We investigated uptake, binding environment, and toxicity of Cu in this plant under emerged and submerged conditions. Extended x-ray absorption fine structure measurements on frozen-hydrated samples revealed that Cu was bound almost exclusively by oxygen ligands, likely organic acids, and not any sulfur ligands. Despite significant differences in photosynthesis biochemistry and biophysics between emerged and submerged plants, no differences in Cu ligands were found. While measurements of tissue pH confirmed the diurnal acid cycle typical for Crassulacean acid metabolism, {Delta}13C measurements showed values typical for regular C3 photosynthesis. Cu-induced inhibition of photosynthesis mainly affected the photosystem II (PSII) reaction center, but with some unusual features. Most obviously, the degree of light saturation of electron transport increased during Cu stress, while maximal dark-adapted PSII quantum yield did not change and light-adapted quantum yield of PSII photochemistry decreased particularly in the first 50 s after onset of actinic irradiance. This combination of changes, which were strongest in submerged cultures, shows a decreasing number of functional reaction centers relative to the antenna in a system with high antenna connectivity. Nonphotochemical quenching, in contrast, was modified by Cu mainly in emerged cultures. Pigment concentrations in stressed plants strongly decreased, but no changes in their ratios occurred, indicating that cells either survived intact or died and bleached quickly.</dcterms:abstract> <dc:contributor>Küpper, Hendrik</dc:contributor> <dc:creator>Küpper, Hendrik</dc:creator> <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/1274"/> <dcterms:bibliographicCitation>Publ. in: Plant Physiology 151 (2009), 2, pp. 702-714</dcterms:bibliographicCitation> <dc:contributor>Küpper, Frithjof Christian</dc:contributor> <dc:creator>Götz, Birgit</dc:creator> </rdf:Description> </rdf:RDF>

Das Dokument erscheint in:

KOPS Suche


Stöbern

Mein Benutzerkonto