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Issue: Vol. 696 No. 3: 3 Apr. 2025
Type: Article
Published: 2025-04-03
DOI: 10.11646/phytotaxa.696.3.4
Page range: 235-252
Abstract views: 120
PDF downloaded: 5

Chromosome numbers and molecular phylogenetics of some endemic orchid species (Orchidaceae) of Sri Lanka

Postgraduate Institute of Science, University of Peradeniya, Sri Lanka; Department of Botany, University of Peradeniya, Sri Lanka
Postgraduate Institute of Science, University of Peradeniya, Sri Lanka; Department of Botany, University of Peradeniya, Sri Lanka
Department of Botany and Biodiversity Research, University of Vienna, Austria
Department of Botany and Biodiversity Research, University of Vienna, Austria
Royal Botanic Gardens, Kew, Richmond, Surrey, UK
Cytogenetics Flora of Sri Lanka Karyotype analysis Epidendroideae Orchidoideae Vanilloideae Monocots

Abstract

In Sri Lanka, Orchidaceae have not been investigated in detail with molecular phylogenetic or cytotaxonomic studies with reference to endemic species. To address this gap, we analysed phylogenetic relationships of 113 species including 15 endemics and five native species, of which cytological investigations of 12 species (nine endemics, three native) are provided for the first time. Data matrixes were produced for nuclear ribosomal ITS (nrDNA) and plastid matK, which we combined with sequences of non-native species from other studies. Parsimony and Baysian analyses were done to investigate the phylogenetic position of the endemic species. The endemics fell with congeneric non-native species in nearly all cases. Chromosome numbers obtained from this study and the literature were mapped on the phylogenetic tree. Chromosome number variation across the tree shows that polyploidy and dysploidy (ascending and descending) have played a role in genomic evolution of the endemic species.

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How to Cite

Ariyarathne, M., Yakandawala, D., Barfuss, M.H.J., Samuel, R. & Chase, M.W. (2025) Chromosome numbers and molecular phylogenetics of some endemic orchid species (Orchidaceae) of Sri Lanka. Phytotaxa 696 (3): 235–252. https://doi.org/10.11646/phytotaxa.696.3.4