e-journal

Phylogeny and divergence times inferred from rps16 sequence data analyses for Tricyrtis (Liliaceae), an endemic genus of north-east Asia

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Abstract.
Background and aims:
Tricyrtis is a genus of monocots with attractive and sophisticated flower shapes and colours,
endemic to north-east Asia. There are 18 known species. The highly restricted geographical
distribution of the genus is of great interest in terms of both abiotic (continental drift) and
biotic (long-distance dispersal) impacts on monocot plant speciation events and their
timing, and of evolutionary patterns of diversification leading to the extant taxa. The aims
of this study were to (i) predict the time of speciation (divergence) events at infraspecific
levels of Tricyrtis, (ii) estimate the rate of evolution of the genus and (iii) provide information
on an excellent plant model system in terms of studying loss of biodiversity or extinction of
organisms in the dynamic earth environment.

Methodology:
To investigate the divergence time and evolution rate of Tricyrtis, Bayesian Markov chain
Monte Carlo (MCMC) analyses were performed by calculating the mean branch lengths of
evolutionary paths based on base substitution variations between rps16 intron nucleotide
sequences from the 18 known species.

Principal results:
Based upon the relaxed molecular clock model test data, a Bayesian phylogenetic inference
tree is presented, and the divergence times and rate of evolution of Tricyrtis were estimated.
The analyses also suggest that evolution is occurring at the infraspecific level of the genus in a
manner that is not strictly clock bound.

Conclusions:
Continental drift may have been the main speciation process giving rise to the current
distribution of the taxa of Tricyrtis. The single-locus gene sequence data presented here are
a significant step towards an improved future understanding of the molecular evolution of
Tricyrtis via multi-locus evaluation.

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Informasi Detail

Judul Seri

AoB PLANTS

No. Panggil

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Penerbit

Oxford : Oxford University Press., 2011

Deskripsi Fisik

AoB PLANTS 2011 plr025 doi:10.1093/aobpla/plr025

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

2011 plr025

Subjek

PEMULIAAN TANAMAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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