Nickel localization in tissues of different hyperaccumulator species of Euphorbiaceae from ultramafic areas of Cuba |
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Authors: | Rosalina Berazaín Vicenta de la Fuente Lourdes Rufo Nuria Rodríguez Ricardo Amils Blanca Díez-Garretas Daniel Sánchez-Mata Alfredo Asensi |
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Institution: | (1) Jardín Botánico Nacional, Universidad de La Habana, 19230 Ciudad Habana, Cuba;(2) Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain;(3) Centro de Astrobiología (INTA-CSIC), 28850 Torrejón de Ardoz, Madrid, Spain;(4) Centro de Biología Molecular, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain;(5) Departamento de Biología Vegetal, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain;(6) Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense de Madrid, 28040 Madrid, Spain |
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Abstract: | Pantropical species of the genera Phyllanthus and Euphorbia and the Cuban endemic genus Leucocroton from the Euphorbiaceae family, were selected for nickel localization microanalysis. Scanning Electron Microscopy coupled
with Energy Dispersive X-ray Microanalysis (SEM-EDX) was used for qualitative detection of nickel in the selected Ni-hyperaccumulator
species: Euphorbia helenae, Leucocroton linearifolius, L. flavicans Phyllanthus orbicularis, P. discolor and P. xpallidus, all collected from Cuban ultramafic soils. The leaves and stems from the Euphorbiaceae species analyzed were the organs
with higher nickel accumulation. Elemental mapping of leaves and stem tissues from these species have been compared. The highest
Ni concentrations were found in the laticifer tubes of stems and the epidermis tissues of leaves in all the analyzed species,
suggesting a general pattern of the Euphorbiaceae family for nickel accumulation. The high nickel concentrations and its rather
homogeneous distribution found in leaves of these Ni-hyperaccumulating plants suggest a possible role in protection mechanisms
against environmental stress, such as UV irradiation. |
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Keywords: | Elemental mapping Euphorbiaceae Nickel Nickel hyperaccumulators SEM-EDX |
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