Isotopic discrimination of zinc in higher plants

A - Papers appearing in refereed journals

Weiss, D. J., Mason, T. F. D., Zhao, F-J., Kirk, G. J. D., Coles, B. J. and Horstwood, M. S. A. 2005. Isotopic discrimination of zinc in higher plants. New Phytologist. 165 (3), pp. 703-710.

AuthorsWeiss, D. J., Mason, T. F. D., Zhao, F-J., Kirk, G. J. D., Coles, B. J. and Horstwood, M. S. A.
Abstract

The extent of isotopic discrimination of transition metals in biological processes is poorly understood but potentially has important applications in plant and biogeochemical studies. Using multicollector inductively coupled plasma (ICP) mass spectrometry, we measured isotopic fractionation of zinc (Zn) during uptake from nutrient solutions by rice (Oryza sativa), lettuce (Lactuca sativa) and tomato (Lycopersicon esculentum) plants. For all three species, the roots showed a similar extent of heavy Zn enrichment relative to the nutrient solution, probably reflecting preferential adsorption on external root surfaces. By contrast, a plant-species specific enrichment of the light Zn isotope occurred in the shoots, indicative of a biological, membrane-transport controlled uptake into plant cells. The extent of the fractionation in the shoots further depended on the Zn speciation in the nutrient solution. The observed isotopic depletion in heavy Zn from root to shoot (-0.13 to -0.26parts per thousand. per atomic mass unit) is equivalent to roughly a quarter of the total reported terrestrial variability of Zn isotopic compositions (c. 0.84parts per thousand. per atomic mass unit). Plant uptake therefore represents an important source of isotopic variation in biogeochemical cycling of Zn.

KeywordsPlant Sciences
Year of Publication2005
JournalNew Phytologist
Journal citation165 (3), pp. 703-710
Digital Object Identifier (DOI)doi:10.1111/j.1469-8137.2004.01307.x
PubMed ID15720681
Open accessPublished as non-open access
Funder project or code512
ISSN0028646X
PublisherWiley

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