Description: Mobilization of aluminium in acidic soils is regarded as a health threat to many European forests. In this project, we are developing biomarkers indicating Al exposure and effects by capitalizing on genome resources recently established for forest trees. Background: Aluminium (Al) is a highly abundant metal which is innocuous at neutral and weakly acidic soil conditions. As soils become more acidic as a result of natural processes or acid deposition, Al is dissolved into toxic Al cations. This form of Al can inhibit root growth at micromolar concentrations resulting in a reduced and damaged root system. Due to continuing deposition of acidifying compounds, soil acidification and its associated dissolution of Al are regarded as a health threat to many European forests. Because soil acidification not only leads to Al mobilization but also to the depletion of base cations (BC), the molar ratio of BC:Al is widely used as an indicator of soil acidification and potential Al toxicity. However, the utility of this indicator is increasingly questioned, and there is a widespread agreement that biomarkers are needed which reflect physiological changes following Al exposure. Aims: This project aims at the development of biomarkers indicating Al exposure and effects by capitalizing on genome resources recently established for forest trees. The project is carried out within the frame of the COST Action E38 Woody Root Processes'. Methods: As a model tree species, we are using poplar for which the entire genome has been deciphered. Biomarkers will be established based on Al-responsive genes. Such genes will be identified by application of microarrays to poplar treated with Al under controlled conditions. Isolated Al-responsive genes will be used to design easy-to-use biomarkers. The established biomarkers will be validated in greenhouse experiments with poplar cultivated on acidic soils with high concentrations of Al in the soil solution. The project is part of the dissertation of Nadine Grisel.
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Tags: Pappel ? Aluminium ? Genom ? Gesundheitsgefährdung ? Waldbaum ? Blei ? Abfallbehandlung ? Baum ? Saurer Regen ? Tracer ? Gewächshaus ? Bodenversauerung ? Wirkung ? Pflanzenwurzel ? Deposition ? Metall ? Holz ? Wirkung ? Bodenzustand ? Bodenqualität ? Bodenlösung ? Exposition ? Rechtsverfahren ? Schadstoffimmobilisierung ? Toxizität ? Wald ? Indikator ? Ressource ? Vertrag ? Kosten ? Potenzial ? Stress ? Boden ? Kationen ? bewerten ? Bedarf ? Bezug ? Einsatz ? Ergebnis ? Experiment ? Formblätter ? Frage ? Ableitung ? Konzentrat ? gebraucht ? Methode ? Mobilisierungspotenzial ? gelöst ? Projekt ? Schadstoffmobilisierung ? Schadstoffremobilisierung ? neu ? Schwermetallmobilisierung ? Schwermetallremobilisierung ? Teil ? Verarbeiten ? Ablagerung ? Verbindung ? Verhältnis ? Verwertung ? unter ? Art [Spezies] ? Wachstum [biologisch] ? Auflösen ? Basen [chemisch] ?
License: Creative Commons Namensnennung-keine Bearbeitung-Nichtkommerziell 4.0
Language: Englisch/English
Last harvest: 31.07.2026 00:25
Time ranges: 2005-06-01 - 2009-03-31
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