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New Phytologist
Volume 175 Issue 4 Page 641-654, September 2007
To cite this article: R. Tappero, E. Peltier, M. Gräfe,
K. Heidel, M. Ginder-Vogel, K. J. T. Livi, M. L. Rivers, M.
A. Marcus, R. L. Chaney, D. L. Sparks (2007)
Hyperaccumulator Alyssum murale relies on a different
metal storage mechanism for cobalt than for nickel
New Phytologist 175 (4), 641–654.
doi:10.1111/j.1469-8137.2007.02134.x
Publication history
Published article online:
02 Jul 2007
Issue online:
06 Aug 2007
Received: 31 January 2007
Accepted: 23 April 2007
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Abstract
Hyperaccumulator Alyssum murale relies on a
different metal storage mechanism for cobalt than
for nickel
R. Tappero 1, E. Peltier 1, M. Gräfe 1, K. Heidel 1, M. Ginder-Vogel 2, K.
J. T. Livi 3, M. L. Rivers 4, M. A. Marcus 5, R. L. Chaney 6 and D. L.
Sparks 1
1 Plant and Soil Sciences, University of Delaware, Newark, DE 19716,
USA; 2 Geological and Environmental Sciences, Stanford University,
Stanford, CA 94305, USA; 3 Earth and Planetary Sciences, John
Hopkins University, Baltimore, MD 21218, USA; 4 Geophysical
Sciences and Center for Advanced Radiation Sources, University of
Chicago, Chicago, IL 60637, USA; 5 Advanced Light Source, Lawrence
Berkeley National Laboratory, Berkeley, CA 94720, USA; 6 USDA-ARS,
Environmental Management and By-products Utilization, Beltsville, MD
20705, USA
Author for correspondence: R. Tappero Tel: +1 302 831 1230
Fax: +1 302 831 0605 Email: rtappero@udel.edu
Key words: Alyssum murale, cobalt (Co), computed-microtomography (CMT),
hyperaccumulation, nickel (Ni), synchrotron X-ray microfluorescence (SXRF),
tolerance.
New Phytologist (2007) 175: 641–654
© The Authors (2007). Journal compilation © New Phytologist (2007)
doi: 10.1111/j.1469-8137.2007.02134.x
Summary
• The nickel (Ni) hyperaccumulator Alyssum murale has been
developed as a commercial crop for
developed as a commercial crop for
phytoremediation/phytomining Ni from metal-enriched soils.
Here, metal co-tolerance, accumulation and localization were
investigated for A. murale exposed to metal cocontaminants.
• A. murale was irrigated with Ni-enriched nutrient solutions
containing basal or elevated concentrations of cobalt (Co) or
zinc (Zn). Metal localization and elemental associations were
investigated in situ with synchrotron X-ray microfluorescence
(SXRF) and computed-microtomography (CMT).
•
A. murale hyperaccumulated Ni and Co (> 1000 µg g 1 dry
weight) from mixed-metal systems. Zinc was not
hyperaccumulated. Elevated Co or Zn concentrations did not
alter Ni accumulation or localization. SXRF images showed
uniform Ni distribution in leaves and preferential localization
of Co near leaf tips/margins. CMT images revealed that leaf
epidermal tissue was enriched with Ni but devoid of Co, that
Co was localized in the apoplasm of leaf ground tissue and
that Co was sequestered on leaf surfaces near the
tips/margins.
• Cobalt-rich mineral precipitate(s) form on leaves of Co-
treated A. murale. Specialized biochemical processes linked
with Ni (hyper)tolerance in A. murale do not confer
(hyper)tolerance to Co. A. murale relies on a different metal
storage mechanism for Co (exocellular sequestration) than
for Ni (vacuolar sequestration).
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Alyssum murale
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computed-microtomography
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R. Tappero
E. Peltier
M. Gräfe
K. Heidel
M. Ginder-Vogel
K. J. T. Livi
M. L. Rivers
M. A. Marcus
R. L. Chaney
D. L. Sparks
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