Palynological analysis of five selected <Emphasis Type="Italic">Onosma</Emphasis> taxa |
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| Authors: | Filippo Maggi Vladislav Kolar?ik Pavol Mártonfi |
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| Institution: | (1) Department of Environmental Sciences, Section of Botany and Ecology, Faculty of Pharmacy, University of Camerino, Via Pontoni 5, IT-62032 Camerino, Italy;(2) Institute of Biology and Ecology, Department of Botany, Faculty of Science, P. J. Šafárik University, Mánesova 23, SK-04154 Košice, Slovakia;(3) Institute of Botany, Slovak Academy of Sciences, Dúbravská cesta 14, SK-84523 Bratislava, Slovakia |
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| Abstract: | Pollen size and exine structure of the following five Onosma L. species from Slovakia and Italy were studied by light and scanning electron microscopy: Onosma echioides, O. tornensis, O. visianii, O. arenaria, and O. pseudoarenaria. Among the taxa studied, O. echioides has the smallest pollen grains in average (10.5–17.5 × 8.0–14.5 μm), and O. pseudoarenaria the largest grains in average (15.3–20.5 × 12.3–16.3 μm). Pollen grains of all 5 species are small sized, 3-syncolporate,
subprolate, heteropolar, with ovate equatorial outlines and circular to rounded triangular polar outlines; the tectum is microechinate.
A positive correlation is found between pollen size and chromosome number. The value of pollen characters for taxonomic purposes
and the position of the taxa studied within the genus Onosma are discussed. |
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| Keywords: | Onosma Boraginaceae pollen size pollen micromorphology taxonomy Italy Slovakia |
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