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Thuniopsis: A New Orchid Genus and Phylogeny of the Tribe Arethuseae (Orchidaceae).

Li L, Ye DP, Niu M, Yan HF, Wen TL, Li SJ - PLoS ONE (2015)

Bottom Line: The new genus is circumscribed and a description and illustrations of the new species are provided.The phylogenetic relationships among the genera in Arethuseae are accessed.Moreover, our phylogeny also shed light on the phylogenetic positions of several genera which, to date, remain uncertain.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, Guangdong, P. R. China.

ABSTRACT
An investigation of a questionable orchid led to the discovery of a new genus and species Thuniopsis cleistogama, endemic to Yunnan province, China. It is characterized by having a subglobose corm, a spike-like (racemose) inflorescence, half opened and spurless flowers, a collar-shaped stigma and subglobose capsules. Based on DNA sequence data from three gene regions (nuclear ribosomal ITS, chloroplast matK and trnL), we investigated its phylogenetic position within the tribe Arethuseae. Phylogenies using maximum likelihood and Bayesian inference support the recognition of Thuniopsis as a distinct genus, and suggest its close relationship to the genera Bletilla, Dilochia, and Thunia. The new genus is circumscribed and a description and illustrations of the new species are provided. The phylogenetic relationships among the genera in Arethuseae are accessed. Moreover, our phylogeny also shed light on the phylogenetic positions of several genera which, to date, remain uncertain.

No MeSH data available.


Related in: MedlinePlus

Thuniopsis cleistogama.A. a plant in inflorescence, B. flower, front view, C. flower, lateral view, D. bract, E. dorsal sepal, F. petal, G. lateral sepal, H. lip, I. column, ventral view, J. column, lateral view, K. anther cap, dorsal view, L. anther cap, ventral view, M. pollinaria. Drawn by Yun-Xiao Liu from L. Li 19.
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pone.0132777.g003: Thuniopsis cleistogama.A. a plant in inflorescence, B. flower, front view, C. flower, lateral view, D. bract, E. dorsal sepal, F. petal, G. lateral sepal, H. lip, I. column, ventral view, J. column, lateral view, K. anther cap, dorsal view, L. anther cap, ventral view, M. pollinaria. Drawn by Yun-Xiao Liu from L. Li 19.

Mentions: Additionally, the stigma characteristics of T. cleistogama are found to be distinct when compared to those of related genera (Figs 2 and 3). It has prominent collar-shaped stigma, with a couple of flap-like forward edges folded back, forming a V-shaped opening. So far, this type of stigma is unusual in the subfamily Epidendroideae, and also unique within orchids.


Thuniopsis: A New Orchid Genus and Phylogeny of the Tribe Arethuseae (Orchidaceae).

Li L, Ye DP, Niu M, Yan HF, Wen TL, Li SJ - PLoS ONE (2015)

Thuniopsis cleistogama.A. a plant in inflorescence, B. flower, front view, C. flower, lateral view, D. bract, E. dorsal sepal, F. petal, G. lateral sepal, H. lip, I. column, ventral view, J. column, lateral view, K. anther cap, dorsal view, L. anther cap, ventral view, M. pollinaria. Drawn by Yun-Xiao Liu from L. Li 19.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4526666&req=5

pone.0132777.g003: Thuniopsis cleistogama.A. a plant in inflorescence, B. flower, front view, C. flower, lateral view, D. bract, E. dorsal sepal, F. petal, G. lateral sepal, H. lip, I. column, ventral view, J. column, lateral view, K. anther cap, dorsal view, L. anther cap, ventral view, M. pollinaria. Drawn by Yun-Xiao Liu from L. Li 19.
Mentions: Additionally, the stigma characteristics of T. cleistogama are found to be distinct when compared to those of related genera (Figs 2 and 3). It has prominent collar-shaped stigma, with a couple of flap-like forward edges folded back, forming a V-shaped opening. So far, this type of stigma is unusual in the subfamily Epidendroideae, and also unique within orchids.

Bottom Line: The new genus is circumscribed and a description and illustrations of the new species are provided.The phylogenetic relationships among the genera in Arethuseae are accessed.Moreover, our phylogeny also shed light on the phylogenetic positions of several genera which, to date, remain uncertain.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, Guangdong, P. R. China.

ABSTRACT
An investigation of a questionable orchid led to the discovery of a new genus and species Thuniopsis cleistogama, endemic to Yunnan province, China. It is characterized by having a subglobose corm, a spike-like (racemose) inflorescence, half opened and spurless flowers, a collar-shaped stigma and subglobose capsules. Based on DNA sequence data from three gene regions (nuclear ribosomal ITS, chloroplast matK and trnL), we investigated its phylogenetic position within the tribe Arethuseae. Phylogenies using maximum likelihood and Bayesian inference support the recognition of Thuniopsis as a distinct genus, and suggest its close relationship to the genera Bletilla, Dilochia, and Thunia. The new genus is circumscribed and a description and illustrations of the new species are provided. The phylogenetic relationships among the genera in Arethuseae are accessed. Moreover, our phylogeny also shed light on the phylogenetic positions of several genera which, to date, remain uncertain.

No MeSH data available.


Related in: MedlinePlus