Zinc ligands in the metal hyperaccumulator Thlaspi caerulescens as determined using X-ray absorption spectroscopy

Journal Article · Mon Mar 01 00:00:00 EST 1999 · Environmental Science and Technology

DOI:https://doi.org/10.1021/es980825x· OSTI ID:335320

Salt, D E ^[1]; Prince, R C ^[2]; Baker, A J.M. ^[3]; Raskin, I ^[4]; Pickering, I J ^[5]

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1. Northern Arizona Univ., Flagstaff, AZ (United States). Chemistry Dept.
2. Exxon Research and Engineering, Annandale, NJ (United States)
3. Univ. of Sheffield (United Kingdom). Dept. of Animal and Plant Sciences
4. Rutgers Univ., New Brunswick, NJ (United States)
5. Stanford Synchrotron Radiation Lab., CA (United States)

Using the noninvasive technique of X-ray absorption spectroscopy (XAS), the authors have been able to determine the ligand environment of Zn in different tissues of the Zn-hyperaccumulator Thlaspi caerulescens. The majority of intracellular Zn in roots of T. caerulescens was found to be coordinated with histidine. In the xylem sap Zn was found to be transported mainly as the free hydrated Zn{sup 2+} cation with a smaller proportion coordinated with organic acids. In the shoots, Zn coordination occurred mainly via organic acids, with a smaller proportion present as the hydrated cation and coordinated with histidine and the cell wall. Their data suggest that histidine plays an important role in Zn homeostasis in the roots, whereas organic acids are involved in xylem transport and Zn storage in shoots.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• OSTI ID: 335320
• Journal Information: Environmental Science and Technology, Vol. 33, Issue 5; Other Information: PBD: 1 Mar 1999
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
56 BIOLOGY AND MEDICINE
APPLIED STUDIES
ZINC
LIGANDS
BIOLOGICAL ACCUMULATION
X-RAY SPECTROSCOPY
PLANTS
LAND POLLUTION
ROOT ABSORPTION
BIOLOGICAL INDICATORS