Stomata in Dioon (fossils)

 

Epidermal micromorphology in Dioon: Did volcanism constrain Dioon evolution?

by Barone Lumaga M. R., Coiro M., Truernit E., Erdei B., De Luca P. (2015)

MARIA ROSARIA BARONE LUMAGA1,
mario_coiro2
MARIO COIRO, Department of Biology, ETH Zurich, 8008 Zurich, Switzerland
ELISABETH TRUERNIT2,
BOGLÁRKA ERDEI3
PAOLO DE LUCA1
1Department of Biology, University of Naples ‘Federico II’, I-80139 Naples, Italy
2Department of Biology, ETH Zurich, 8008 Zurich, Switzerland
3Botanical Department, Hungarian Natural History Museum, POB 222, 1476 Budapest, Hungary

Epidermal micromorphology in Dioon: Did volcanism constrain Dioon evolution?. Available from: https://www.researchgate.net/publication/281371639_Epidermal_micromorphology_in_Dioon_Did_volcanism_constrain_Dioon_evolution [accessed Dec 14, 2016].

in Botanical Journal of the Linnean Society · August 2015 – DOI: 10.1111/boj.12326 –

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Abstract

The genus Dioon occupies an important phylogenetic position as sister to the other Zamiaceae. However, its epidermal morphology is still poorly known. We employed scanning and transmission electron microscopy, confocal microscopy and light microscopy to examine the epidermal and cuticular morphology of 12 of the 14 currently recognized species of Dioon, examining cultivated plants and herbarium specimens.
Epidermal characters separate Dioon quite clearly from the other genera of the cycads. Within the genus, the major subgroups can be distinguished by their epidermal morphology. Some characters, such as the degree of stomatal protection, reflect
ecological specializations in species within the subgroups. Several epidermal characters of the crown group Dioon seem to be absent in the Cenozoic fossils usually associated with the genus, which have been used as calibrations in many recent molecular dating analyses.
The presence of similar characters in a Mesozoic fossil adapted to volcanic stress offers a new key in the interpretation of Dioon evolution.

Epidermal micromorphology in Dioon: Did volcanism constrain Dioon evolution?. Available from: https://www.researchgate.net/publication/281371639_Epidermal_micromorphology_in_Dioon_Did_volcanism_constrain_Dioon_evolution [accessed Dec 25, 2016].

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Published by

Willem Van Cotthem

Honorary Professor of Botany, University of Ghent (Belgium). Scientific Consultant for Desertification and Sustainable Development.

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