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Scanning Electron Microscopy Coupled with Energy Dispersive Spectrometric Analysis Reveals for the First Time Weddellite and Sylvite Crystals on the Surface of Involucral Bracts and Petals of two Xeranthemum L. (Compositae) Species

Part of: Micrographia Collection

Published online by Cambridge University Press:  26 May 2017

Milan Gavrilović ,
Suzana Erić ,
Petar D. Marin ,
Núria Garcia-Jacas ,
Alfonso Susanna  and
Pedja Janaćković
Milan Gavrilović*
Affiliation:
Institute of Botany and Botanical Garden “Jevremovac”, Faculty of Biology, University of Belgrade, Studentski trg 16, 11000, Belgrade, Serbia
Suzana Erić
Affiliation:
Faculty of Mining and Geology, University of Belgrade, Ðušina 7, 11000 Belgrade, Serbia
Petar D. Marin
Affiliation:
Institute of Botany and Botanical Garden “Jevremovac”, Faculty of Biology, University of Belgrade, Studentski trg 16, 11000, Belgrade, Serbia
Núria Garcia-Jacas
Affiliation:
Botanic Institute of Barcelona (IBB-CSIC-ICUB), Pg. del Migdia s. n., 08038 Barcelona, Spain
Alfonso Susanna
Affiliation:
Botanic Institute of Barcelona (IBB-CSIC-ICUB), Pg. del Migdia s. n., 08038 Barcelona, Spain
Pedja Janaćković
Affiliation:
Institute of Botany and Botanical Garden “Jevremovac”, Faculty of Biology, University of Belgrade, Studentski trg 16, 11000, Belgrade, Serbia
*
* Corresponding author. [email protected]
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Abstract

In this work, weddellite and sylvite crystals are identified for the first time on the involucral bracts and petals of Xeranthemum annuum and Xeranthemum cylindraceum using scanning electron microscopy coupled with energy dispersive spectrometric (SEM-EDS) analysis. Well-developed crystals of weddellite (CaC2O4·2H2O) occur in the form of a tetragonal bipyramid (hhl), rarely in combination of a bipyramid and tetragonal prism (h00). Indumentum of involucral bracts of X. cylindraceum consists of nonglandular and glandular trichomes. Sylvite (KCl) crystals are observed only on the petal surface of X. cylindraceum. The crystals of sylvite occur in the form of perfect cubes (hexahedrons), but some crystals are deformed, i.e., partially elongated. Taxonomic significance of investigated microcharacters as well as the use of SEM-EDS analysis in taxonomic studies of plants are discussed.

Keywords

SEM-EDSweddellite and sylvite crystalsXeranthemumCardueaeinvolucral bracts and petals
Type
Micrographia
Information
Microscopy and Microanalysis , Volume 23 , Issue 3 , June 2017 , pp. 679 - 686
Copyright
© Microscopy Society of America 2017 

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