Molecular phylogeny of Dendrobium Callista-Dendrobium complex

Wongsawad P., . and Handa T., . and Yukawa T., . (2005) Molecular phylogeny of Dendrobium Callista-Dendrobium complex. [Proceedings Paper]

Within one of the largest orchid genera Dendrobium sections Dendrobium ca. 60 species and Callista 14 species include many horticulturally important species such as D. nobile D. anosmum D. chrysotoxum and D. densiflorum. Although the floral structure of section Dendrobium is identical with that of section Callista a single character- the reduced leaf sheath-characterizes the latter. To clarify genetic relationships and taxonomic positions of Dendrobium sections Dendrobium and Callista molecular phylogenetic analyses of the internal transcription spacer ITS region of the nuclear ribosomal DNA and the maturase-encoding gene matK of the chloroplast genome were conducted. The principal results from this study show that: 1 Phylogenetic trees are highly correlated between ITS and matK analyses. 2 Dendrobium and Callista sections are not monophyletic because several species in section Callista are nested within the clades of section Dendrobium. 3 Section Dendrobium comprises at least 7 clades. 4 Section Callista comprises at least 3 clades. 5 Results from hybridization experiments are generally consistent with phylogenetic relationships inferred from the analyses. The results suggest a neccessity for taxonomic revisions of the complex and offer new directions for breeding programmes.

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Abstract

Within one of the largest orchid genera Dendrobium sections Dendrobium ca. 60 species and Callista 14 species include many horticulturally important species such as D. nobile D. anosmum D. chrysotoxum and D. densiflorum. Although the floral structure of section Dendrobium is identical with that of section Callista a single character- the reduced leaf sheath-characterizes the latter. To clarify genetic relationships and taxonomic positions of Dendrobium sections Dendrobium and Callista molecular phylogenetic analyses of the internal transcription spacer ITS region of the nuclear ribosomal DNA and the maturase-encoding gene matK of the chloroplast genome were conducted. The principal results from this study show that: 1 Phylogenetic trees are highly correlated between ITS and matK analyses. 2 Dendrobium and Callista sections are not monophyletic because several species in section Callista are nested within the clades of section Dendrobium. 3 Section Dendrobium comprises at least 7 clades. 4 Section Callista comprises at least 3 clades. 5 Results from hybridization experiments are generally consistent with phylogenetic relationships inferred from the analyses. The results suggest a neccessity for taxonomic revisions of the complex and offer new directions for breeding programmes.

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Item Type:	Proceedings Paper
Additional Information:	Summary En
AGROVOC Term:	DENDROBIUM
AGROVOC Term:	PHYLOGENY
AGROVOC Term:	MOLECULAR GENETICS
AGROVOC Term:	TAXONOMY
AGROVOC Term:	DNA
AGROVOC Term:	GENES
AGROVOC Term:	LEAVES
AGROVOC Term:	HYBRIDIZATION
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:27
URI:	http://webagris.upm.edu.my/id/eprint/16541

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