title: Localization of nickel in tissues of Streptanthus polygaloides Gray (Cruciferae) and endemic nickel hyperaccumulators from California.
abstract: The genus Streptanthus Nutt. is one of the most important indicators of ultramafic floras in western North America. This genus contains taxa that are endemic or tolerant of ultramafic soils. Streptanthus polygaloides is an annual nickel hyperaccumulator strictly confined to ultramafic soils throughout the Californian Sierra Nevada foothills. Nickel concentration in S. polygaloides populations was evaluated by elemental microanalysis using inductively coupled plasma mass spectrometry (ICP-MS). Representative samples of S. polygaloides roots, stems, leaves, flowers, and fruits were studied by scanning electron microscopy (SEM) coupled to an energy-dispersive X-ray probe (SEM-EDX). Results show Ni accumulation values between 0.09 and 1.18 %, and a distribution pattern similar to that observed in other Ni hyperaccumulator taxa, with the leaf epidermis accumulating the largest concentrations.
authors: Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense, 28040, Madrid, Spain, dsmata@farm.ucm.es.
authors: Daniel
authors: D
authors: Sánchez-Mata
authors: Vicenta
authors: V
authors: de la Fuente
authors: Lourdes
authors: L
authors: Rufo
authors: Nuria
authors: N
authors: Rodríguez
authors: Ricardo
authors: R
authors: Amils
mesh_terms: D019607:Brassicaceae / Q000378:metabolism*; D002140:California; D013058:Mass Spectrometry; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000378:metabolism*; D013052:Spectrometry, X-Ray Emission
chemical_list: D009532:Nickel