Create your own conference schedule! Click here for full instructions

Abstract Detail


Huang, Han-Yau [1], Chung, Kuo-Fang [2], Peng, Ching-I [3].

A population genetics study of widespread Begonia (Begoniaceae) species from limestone karst area in Guangxi China.

To investigate the origin of limestone karst biodiversity, this project takes Sino- Vietnamese limestone Begonia as a model system. We incorporate the studies of population genetics and phylogeography of limestone Begonia to test the hypothesis of allopatric speciation via isolation-by-distance triggered by extensive karstification. We sampled 20 populations of a widely distributed species of Begonia sect. Coelocentrum, B. luzhaiensis, from limestone karst area of Guangxi, China. Using next-generation sequencing (NGS) technique, 44,368 contigs were assembled, revealing 5,602 EST-SSR loci and resulting in 12 polymorphic EST-SSR markers for B. luzhaiensis. Significantly high Fst suggests strong population differentiation. Based on Bayesian clustering analyses, all populations were restrictively distributed in isolation localities. Mantel Tests indicate a significant positive correlation between genetic differentiation and geographic distances, concurring to geographic speciation via isolation-by-distance. Haplotype network reconstructed using cpDNA trnC-ycf6 sequences portrays a highly geographic-correlated phylogeographic pattern, also supporting the hypothesis of population differentiation via geographic isolation. Our data support strongly the importance of extensive karstification in shaping the species diversity on the Sino-Vietnamese limestone karsts. From a conservation prospective, geographically isolated populations on limestone karsts often harbor unique genetic variation that is threaten by rapid habitat destructions and their uniqueness deserves high conservation priority.

Log in to add this item to your schedule

1 - National Taiwan University, School of Forestry and Resource Conservation, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan(R.O.C)
2 - National Taiwan University, School of Forestry and Resource Conservation, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan
3 - Academia Sinica, Biodiversity Research Center, 128 Academia Road, Section 2, Nankang, , Taipei , 11529, Taiwan(R.O.C)

next generation sequencing
non-adaptive radiation
phylogenetic network.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Eyrie/Boise Centre
Date: Monday, July 28th, 2014
Time: 5:30 PM
Number: PBG017
Abstract ID:915
Candidate for Awards:None

Copyright 2000-2013, Botanical Society of America. All rights reserved