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Phylogeny of selaginellaceae: Evaluation of generic subgeneric relationships based on rbcL gene sequences
Department of Botany, Stockholm University, S-106 91 Stockholm, Sweden.
1999 (English)In: International journal of plant sciences, ISSN 1058-5893, E-ISSN 1537-5315, Vol. 160, no 3, 585-594 p.Article in journal (Refereed) Published
Abstract [en]

A cladistic analysis based on rbcL gene sequences from a representative sample of 18 species yields three most parsimonious trees that strongly support monophyly of Selaginellaceae. Within Selaginellaceae, the morphologically distinctive subgenus Selaginella is resolved as sister group to a clade composed of all other species, here termed the rhizophoric clade. In the rhizophoric clade, subgenus Stachygynandrum is paraphyletic to subgenera Ericetorum, Tetragonostachys, and Heterostachys. Monophyly of Ericetorum and Tetragonostachys is strongly corroborated. Results support a close relationship between "resurrection plants" in Stachygynandrum and the mat-forming or tufted drought-tolerant species of Tetragonostachys, indicating a common origin of xerophytism in these groups. A close relationship for all isophyllous species, as hypothesized in many classifications, is not supported by the rbcL data. Leaf isophylly and reduction in Ericetorum and Tetragonostachys most probably represent independent reversals of the marked anisophyllous condition in Stachygynandrum, Leaf reduction is one of a suite of characters that may have evolved in response to seasonal drought.

Place, publisher, year, edition, pages
1999. Vol. 160, no 3, 585-594 p.
Keyword [en]
systematics, Selaginellaceae, rbcL, phylogeny, xerophyte
National Category
Biological Systematics
Identifiers
URN: urn:nbn:se:uu:diva-162128DOI: 10.1086/314137ISI: 000081190000016OAI: oai:DiVA.org:uu-162128DiVA: diva2:459033
Available from: 2011-11-24 Created: 2011-11-24 Last updated: 2017-12-08

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Korall, Petra

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