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Abstract Detail



Systematics Section/ASPT

Takawira Nyenya, Ratidzayi [1], Brysting, Anne Krag [2], Kativu, Shakkie [3], Wilkin, Paul [4], Stedje , Brita [1].

Molecular Phylogeny of the genera Dracaena Vand.ex L. and Sansevieria Thunb. (Asparagaceae).

The genera Dracaena and Sansevieria and (family Asparagaceae) belong to order Asparagales, a plant group that includes 40% of all monocotyledons. Members of the two genera are of great cultural and economic importance worldwide as ornamentals, sources of traditional medicine and the later as a source of fibre in many indigenous cultures in its geographical range. In spite of their economic importance, the taxonomy and systematics of Dracaena and Sansevieria has remained controversial. Proposals have been put forward to merge the two genera based on similarities observed in their flora morphology and more recently based on chloroplast DNA phylogeny. The aim of the current study was to to study the inter and intra-genera relationships of Dracaena and Sansevieria based on combined evidence from nuclear and chloroplast molecular DNA sequence data. Sampling for this study included 45 accessions belonging to genus Dracaena, corresponding to 30 species and 58 accessions belonging to genus Sansevieria and corresponding to 33 species. Phylogenetic analyses were based on nucleotide sequences of two non-coding plastid DNA regions, the trnL-F region (trnL intron and trnL-trnF intergenic spacer) and the rps16 intron and the low copy nuclear region At 103. Phylogenies were constructed using Maximum parsimony and Bayesian inference. Plastid and nuclear datasets were analysed jointly and separately. Nuclear and combined phylogenies offered the best resolution. Maximum parsimony and Bayesian inference phylogenetic analyses showed that Sansevieria is monophyletic and recently diversified, while Dracaena is paraphyletic. We identified three subclades of Sansevieria which partially correspond to the current subgeneric classification of genus Sansevieria; Sansevieria, Paniculatus and Capitulatus. The results obtained in the current study partially support previous infrageneric arrangements in genus Sansevieria. Different intragenic groups reflecting well known biogeographic patterns could be detected in both genera.


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1 - University of Oslo, Natural History Museum, P.O.Box 1172, Blindern, N-0318 Oslo, Norway, OS, +47, Norway
2 - University of Oslo, Centre for Ecological and Evolutionary Synthesis, Department of Biosciences/Institutt for biovitenskap, P.O. Box 1066, Blindern , 0316 Oslo, Norway
3 - University of Zimbabwe, Biological Sciences, P.O.Box MP 167, Mount Pleasant, Harare, Zimbabwe
4 - Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB, , UK

Keywords:
biogeography
Dracaena
Phylogeny
Sansevieria
systematics.

Presentation Type: Oral Paper:Papers for Sections
Session: 33
Location: Salon 10/The Shaw Conference Centre
Date: Tuesday, July 28th, 2015
Time: 11:15 AM
Number: 33013
Abstract ID:808
Candidate for Awards:None


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