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 inDioon: did volcanism constrainDioonevolution? / BARONE LUMAGA, MARIA ROSARIA; Coiro, Mario; Truernit, Elisabeth; Erdei, Boglárka; DE LUCA, Paolo. - In: BOTANICAL JOURNAL OF THE LINNEAN SOCIETY. - ISSN 0024-4074. - 179:2(2015), pp. 236-254. [10.1111/boj.12326]

Epidermal micromorphology inDioon: did volcanism constrainDioonevolution?

BARONE LUMAGA, MARIA ROSARIA;DE LUCA, PAOLO
2015

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.
2015
Epidermal micromorphology inDioon: did volcanism constrainDioonevolution? / BARONE LUMAGA, MARIA ROSARIA; Coiro, Mario; Truernit, Elisabeth; Erdei, Boglárka; DE LUCA, Paolo. - In: BOTANICAL JOURNAL OF THE LINNEAN SOCIETY. - ISSN 0024-4074. - 179:2(2015), pp. 236-254. [10.1111/boj.12326]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/667460
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