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Annals of Botany 86: 73-78, 2000
© 2000 Annals of Botany Company

Relative Abundance of Nickel in the Leaf Epidermis of Eight Hyperaccumulators: Evidence that the Metal is Excluded from both Guard Cells and Trichomes

G. K. Psaras+, Th. Constantinidis, B. Cotsopoulos and Y. Manetas

Section of Plant Biology, Department of Biology, School of Sciences, University of Patras, Patras, 265 00, Greece Laboratory of Electron Microscopy and Microanalysis, School of Sciences, University of Patras, Patras, 265 00, Greece

Received: 15 November 1999 ; Returned for revision: 2 February 2000 . Accepted: 16 March 2000

Scanning electron microscopy combined with X-ray microanalysis was used to localize the sites of nickel accumulation on the leaf epidermis of eight nickel accumulators grown on ultramafic soils in Greece. In all species, nickel was excluded from guard cells, and in species possessing hairy leaves (seven out of eight) nickel was excluded from the hairs. In some species the metal was present in subsidiary cells, yet at low levels, while the sites of higher accumulation were epidermal cells away from stomata. Results indicate that nickel is not compatible with the functions and development of certain epidermal cell types. Copyright 2000 Annals of Botany Company

Brassicaceae, epidermis, metal hyperaccumulators, microanalysis, serpentine plants


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