Leaf-morphology and leaf-anatomy in Ephedra altissima Desf. (Ephedraceae, Gnetales) and their evolutionary relevance

No Thumbnail Available
Files
There are no files associated with this item.
Date
2014
Editors
Contact
Journal ISSN
Electronic ISSN
ISBN
Bibliographical data
Publisher
Series
URI (citable link)
DOI (citable link)
ArXiv-ID
International patent number
Link to the license
oops
EU project number
Project
Open Access publication
Collections
Restricted until
Title in another language
Research Projects
Organizational Units
Journal Issue
Publication type
Journal article
Publication status
Published in
Feddes Repertorium ; 123 (2014), 4. - pp. 243-255. - ISSN 0014-8962. - eISSN 1522-239X
Abstract
Leaves in most extant Ephedra -species represent only rudimentary scales without chlorophyll. Photosynthesis is completely restricted to green shoots. Only some species, e.g. Ephedra altissima, develop folious leaves even when being mature. Morphology and anatomy of cotyledons, primary leaves, and subsequent folious leaves of Ephedra altissima were examined particularly with special focus on their vasculature. The results show that the reduction of the leaves is achieved by an extreme reduction of the adaxial leaf surface. Most parts of the leaf surface are therefore developed by the abaxial side. Apart from a reduced lamina, a thick cuticle and sunken stomata are the only xerothermic adaptations in leaves of Ephedra altissima. A hypodermis and endodermis are also not developed. The anatomical results indicate that ancestors of modern Ephedra- species might have evolved in a more humid climate, contrasting to the arid habitats in which extant Ephedra- species are native today.
Summary in another language
Subject (DDC)
570 Biosciences, Biology
Keywords
Ephedra, gymnosperms, endodermis, hypodermis, leaves, vasculature
Conference
Review
undefined / . - undefined, undefined. - (undefined; undefined)
Cite This
ISO 690DÖRKEN, Veit, 2014. Leaf-morphology and leaf-anatomy in Ephedra altissima Desf. (Ephedraceae, Gnetales) and their evolutionary relevance. In: Feddes Repertorium. 123(4), pp. 243-255. ISSN 0014-8962. eISSN 1522-239X. Available under: doi: 10.1002/fedr.201200020
BibTex
@article{Dorken2014Leafm-29286,
  year={2014},
  doi={10.1002/fedr.201200020},
  title={Leaf-morphology and leaf-anatomy in Ephedra altissima D<sub>esf</sub>. (Ephedraceae, Gnetales) and their evolutionary relevance},
  number={4},
  volume={123},
  issn={0014-8962},
  journal={Feddes Repertorium},
  pages={243--255},
  author={Dörken, Veit}
}
RDF
<rdf:RDF
    xmlns:dcterms="http://purl.org/dc/terms/"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:bibo="http://purl.org/ontology/bibo/"
    xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#"
    xmlns:foaf="http://xmlns.com/foaf/0.1/"
    xmlns:void="http://rdfs.org/ns/void#"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > 
  <rdf:Description rdf:about="https://kops.uni-konstanz.de/server/rdf/resource/123456789/29286">
    <dcterms:abstract xml:lang="eng">Leaves in most extant Ephedra -species represent only rudimentary scales without chlorophyll. Photosynthesis is completely restricted to green shoots. Only some species, e.g. Ephedra altissima, develop folious leaves even when being mature. Morphology and anatomy of cotyledons, primary leaves, and subsequent folious leaves of Ephedra altissima were examined particularly with special focus on their vasculature. The results show that the reduction of the leaves is achieved by an extreme reduction of the adaxial leaf surface. Most parts of the leaf surface are therefore developed by the abaxial side. Apart from a reduced lamina, a thick cuticle and sunken stomata are the only xerothermic adaptations in leaves of Ephedra altissima. A hypodermis and endodermis are also not developed. The anatomical results indicate that ancestors of modern Ephedra- species might have evolved in a more humid climate, contrasting to the arid habitats in which extant Ephedra- species are native today.</dcterms:abstract>
    <dcterms:title>Leaf-morphology and leaf-anatomy in Ephedra altissima D&lt;sub&gt;esf&lt;/sub&gt;. (Ephedraceae, Gnetales) and their evolutionary relevance</dcterms:title>
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/28"/>
    <dc:contributor>Dörken, Veit</dc:contributor>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/28"/>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2014-11-24T16:12:25Z</dc:date>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dc:creator>Dörken, Veit</dc:creator>
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2014-11-24T16:12:25Z</dcterms:available>
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/29286"/>
    <dcterms:issued>2014</dcterms:issued>
    <dc:language>eng</dc:language>
  </rdf:Description>
</rdf:RDF>
Internal note
xmlui.Submission.submit.DescribeStep.inputForms.label.kops_note_fromSubmitter
Contact
URL of original publication
Test date of URL
Examination date of dissertation
Method of financing
Comment on publication
Alliance license
Corresponding Authors der Uni Konstanz vorhanden
International Co-Authors
Bibliography of Konstanz
Yes
Refereed