Publication Type Journal Article
Title Nickel speciation in the xylem sap of the hyperaccumulator Alyssum serpyllifolium ssp lusitanicum growing on serpentine soils of northeast Portugal
Authors Sheila Alves Cristina Nabais Maria de Lurdes Simoes Goncalves Margarida Correia dos Santos
Groups
Journal JOURNAL OF PLANT PHYSIOLOGY
Year 2011
Month October
Volume 168
Number 15
Pages 1715-1722
Abstract Nickel speciation was studied in the xylem sap of Alyssum serpyllifolium ssp. lusitanicum, a Ni-hyperaccumulator endemic to the serpentine soils of northeast Portugal. The xylem sap was collected from plants growing in its native habitat and characterized in terms of carboxylic and amino acids content. The speciation of nickel was studied in model and real solutions of xylem sap by voltammetric titrations using Square Wave Voltammetry (SWV). The results showed that Ni transport in the xylem sap occurs mainly as a free hydrated cation (about 70\%) and complexed with carboxylic acids, mainly citric acid (18\%). Altogether, oxalic acid, malic acid, malonic acid and aspartic acid complexed less than 13\% of total Ni. A negligible amount bounded to the amino acids, like glutamic acid and glutamine (<1\%). Histidine did not play a role in Ni translocation in the xylem sap of A. serpyllifolium under field conditions. Amino acids are one of the main forms of N transport in the xylem sap, and under field conditions, N is usually a limited nutrient. We hypothesize that the translocation of Ni in the xylem sap as a free ion or chelated with carboxylic acids is cheaper in terms of N resources. (C) 2011 Elsevier GmbH. All rights reserved.
DOI http://dx.doi.org/10.1016/j.jplph.2011.04.004
ISBN
Publisher
Book Title
ISSN 0176-1617
EISSN
Conference Name
Bibtex ID ISI:000295703100001
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