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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

Phytolith analysis of Cyperaceae from the Pampean region, Argentina

Mariana Fernández Honaine A C D , Alejandro F. Zucol B C and Margarita L. Osterrieth A
+ Author Affiliations
- Author Affiliations

A Instituto de Geología de Costas y del Cuaternario, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, CC 722, Correo Central, (7600) Mar del Plata, Buenos Aires, Argentina.

B Laboratorio de Paleobotánica, Centro de Investigaciones Científicas (CICYTTP–CONICET), Dr Materi y España (E3105BWA) Diamante, Entre Ríos, Argentina.

C Comisión Nacional de Investigaciones Científicas y Tecnológicas (CONICET).

D Corresponding author. Email: fhonaine@mdp.edu.ar

Australian Journal of Botany 57(6) 512-523 https://doi.org/10.1071/BT09041
Submitted: 21 February 2009  Accepted: 20 August 2009   Published: 9 November 2009

Abstract

Cyperaceae, along with Poaceae, is the main silica accumulator. Although the anatomical-taxonomic and palaeobotanical relevance of phytoliths has been well established, there are no studies that deal with the qualitative and quantitative aspects of the phytolith production or differentiate phytoliths from the different organs in Cyperaceae. Toward the construction of a detailed database of phytolith production, we describe in the present paper the phytoliths of leaves, culms and fruits of Cyperaceae from Pampean region (Argentina). Phytoliths were extracted by a calcination technique. Qualitative and quantitative characters and percentages of phytolith morphotypes were subject to principal component analysis to analyse their taxonomic relevance. For some sedges, values of phytolith content and a comparative analysis of leaves, culms and fruit phytoliths are presented here for the first time. Diverse tissues such as epidermis, xylem, parenchyma and sclerenchyma produced phytoliths. The most abundant morphotypes were conical phytoliths, which showed differences in the base shape and in their size between organs. Leaf/culm cones have a rounded, rectangular or square base; typical fruit cones have a polygonal base and they are bigger and more robust. PCA showed that quantitative and qualitative characters of cones, along with the percentages of morphotypes, allowed group distinction.


Acknowledgements

This work was supported by the Agencia Nacional de Promoción Científica y Tecnológica (PICT 1700, PICT 07 13864), Universidad Nacional de Mar del Plata (EXA 292/04) and CONICET (postgraduate fellowship to M. F. H.). We greatly thank Professor Rosa E. Guaglianone for the help in the identification and selection of the species, for the extensive bibliography and for the comments and suggestions on the first version of the manuscript, and Dr A. M. Avalos for the corrections and suggestions to the text.


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