NDLI: Systematics of Fraxinus (Oleaceae) and evolution of dioecy

Content Provider	Springer Nature Link
Author	Wallander, Eva
Copyright Year	2008
Abstract	Phylogenetic relationships among 40 of the 43 recognized species of Fraxinus L. (Oleaceae) were estimated on the basis of 106 nuclear ribosomal ITS sequences. ITS trees resulting from maximum likelihood (ML), maximum parsimony (MP) and Bayesian inference (BI) are congruent and identify six distinct lineages. These clades allow establishing sections with high molecular and morphological support. The basal resolution generally has low ML bootstrap and MP jackknife support, but the Bayesian posterior probabilities are high for certain relationships. An independent data set of combined sequences from the chloroplast rps16 and trnL-F regions contains few informative sites but corroborate most of the relationships in the ITS tree. The molecular phylogeny is discussed in the light of morphological and other data and a revised infrageneric classification with six sections are presented. The subgenera and subsections are abandoned and the section Pauciflorae is a new combination. Fraxinus quadrangulata and Fraxinus anomala are united with Fraxinus dipetala in the section Dipetalae and Fraxinus platypoda is transferred to the section Fraxinus. Fraxinus chiisanensis, Fraxinus spaethiana and Fraxinus cuspidata are treated as incertae sedis. A sectional key is given, together with a systematic list of the 43 recognized species, with common synonyms and distribution. Breeding system and other traits mapped on the phylogeny show that dioecy has three separate origins, and in each case followed after the transition from insect to wind pollination. In one instance dioecy evolved from hermaphroditism via androdioecy and twice via polygamy.
Starting Page	25
Ending Page	49
Page Count	25
File Format	PDF
ISSN	03782697
Journal	Plant Systematics and Evolution
Volume Number	273
Issue Number	1-2
e-ISSN	16156110
Language	English
Publisher	Springer Vienna
Publisher Date	2008-04-18
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fraxinus Oleaceae ITS Phylogeny Key Classification Taxonomy Section Pauciflorae Plant Systematics/Taxonomy/Biogeography Plant Anatomy/Development Plant Ecology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science Ecology, Evolution, Behavior and Systematics

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