Abstract Detail



Systematics

Weitemier, Kevin [1], Edwards, Taylor [2], Dimmitt, Mark [3].

Phylogenetic analysis of Adenium (Apocynaceae) from chloroplast, mitochondrial, and nuclear markers.

Adenium (Apocynaceae) is a genus of succulents native to Africa and the Arabian Peninsula, many of which are popular ornamentals. Although a number of species and varieties have been characterized morphologically, the taxonomy of this genus is convoluted and remains in flux. We present the first phylogenetic reconstruction of the genus. We sequenced five loci from the mitochondrial, chloroplast, and nuclear genomes, with sampling from 43 cultivated Adenium specimens from known wild localities, representing 9 species. Phylogenetic reconstructions and haplotype networks for each of the five loci were concordant, suggesting three major clades matching geographic distributions: Southern African, East African/Sahel, and Arabian. The only exception to the geographic delineation of clades was A. multiflorum from southern Africa, which belongs to the East African clade. The clear genetic distinction shown here between African and Arabian Adenium, suggests that the name A. obesum, with a type specimen from Yemen but applied by multiple authors to plants from Africa, is misapplied to African specimens. There is some sharing of chloroplast haplotypes among species of the Arabian clade, and sharing of nuclear PhyA and chloroplast haplotypes among members of the East Africa/Sahel clade, suggesting that species delineations within these clades require further evaluation.


1 - Oregon State University, Fisheries and Wildlife, 104 Nash Hall, Corvallis, OR, 97331, USA
2 - University of Arizona, Genetics Core, Tucson, AZ, 85721, USA
3 - Retired, Tucson, AZ, 85745, USA

Keywords:
Multi-locus
Apocynaceae
Adenium
phylogeny.

Presentation Type: Oral Paper
Number:
Abstract ID:748
Candidate for Awards:None


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