Resumo

FERNANDEZ HONAINE, MARIANA; DE RITO, MARA  e  OSTERRIETH, MARGARITA. Análisis de los silicofitolitos presentes en especies de las familias cannabaceae, moraceae y urticaceae del se bonaerense y estudio comparativo de los cistolitos. Bol. Soc. Argent. Bot. [online]. 2018, vol.53, n.2, pp.1-10. ISSN 1851-2372.

Silicophytolith analyses in species of Cannabaceae, Moraceae and Urticaceae from SE Buenos Aires province and a comparative study of their cystoliths. Numerous families produce silicophytoliths in their tissues, which constitute a relevant taxonomic and palaeobotanical tool. Cystoliths are one of the morphologies produced by dicotyledons, and they are defined as deposits of amorphous calcium carbonate with a silica stalk. This amorphous silica stalk remains on soils and sediments, and constitutes a diagnostic morphology for palaeoenvironmental and archaeological phytolith studies. In this work, the phytoliths of six species of Cannabaceae, Moraceae and Urticaceae, all cystolith producers, were analyzed. Phytoliths were extracted through a calcination technique, and the description of the morphologies and the measurements on cystoliths were carried on through optic and scanning electron microscopes. Statistical tests were applied in order to analyze differences. All the species analyzed produced phytoliths. The frst descriptions for three species of Urticaceae and one of Moraceae were shown. Cystoliths, hairs and polyhedrical phytoliths were described, and differentiation was achieved at family level. Celtis spp (Cannabaceae) and Morus alba L. (Moraceae) produce phytoliths different from Urticaceae species, and they present a hair associated, they are thinner and shorter. These features, as well as the morphometric measured variables, could be used for taxa differentiation in fossil phytolith record.

Palavras-chave : Amorphous silica biomineralization, Morus alba, Celtis spp., Parietaria spp., Urtica urens, SE Pampean region..

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