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Arsenic response in roots of Eucalyptus spp.
conference contribution
posted on 2012-01-01, 00:00 authored by J T Sanchez-Palacios, Damien CallahanDamien Callahan, A J M Baker, I E Woodrow, A I Doronila, Y D Wang, R N CollinsThe use of deep-rooted woody plants offers a means of remediating and stabilizing Arsenic (As)-rich contaminated soil and tailings often associated with mining activities. However, precisely how these plants respond to arsenic is not well understood. Studies on the responses of eucalypts to high levels of arsenic show variation in both performance and As-uptake. For example, in studies on sugar gum (Eucalyptus cladocalyx) relative growth rate was reduced by 50% and accumulated 99% of As in the roots, ranging from 111 to 746 %mu;g/g d.w. Tissue As was found to be in a reduced form, As III, coordinated to PhytoChelatins (PCs), largely as AsIII-PC 3 . Oxidized PC 2 was also present ranging from 143 to 347 %mu;g/g f.w. Cellular localization studies further showed As-complexation to occur in the root endodermis with undetectable amounts in the vascular bundles. These results suggest that arsenic complexes play an important role in As-tolerance, and that selective breeding of eucalypts with enhanced-PC synthesis may help in the improvement of As-mine-site stabilization.
History
Event
International Society of Groundwater for Sustainable Development. Conference (4th : 2012 : Cairns, Qld.)Series
International Society of Groundwater for Sustainable Development ConferencePagination
332 - 334Publisher
CRC Press/BalkemaLocation
Cairns, Qld.Place of publication
Leiden, The NetherlandsStart date
2012-07-22End date
2012-07-27ISBN-13
9780415637633Language
engPublication classification
E Conference publication; E1.1 Full written paper - refereedCopyright notice
2012, Taylor & Francis GroupEditor/Contributor(s)
J Ng, B Noller, R Naidu, J Bundschuh, P BhattacharyaTitle of proceedings
As 2012 : Understanding the geological medical interface of arsenic : Proceedings of the 4th International Congress: Arsenic in the EnvironmentUsage metrics
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