Tree Genetics & Genomes

, 12:90

Conservation genetics of rare trees restricted to subtropical montane cloud forests in southern China: a case study from Quercus arbutifolia (Fagaceae)

  • Jin Xu
  • Xiao-Long Jiang
  • Min Deng
  • Murphy Westwood
  • Yi-Gang Song
  • Si-Si Zheng
Original Article

DOI: 10.1007/s11295-016-1048-1

Cite this article as:
Xu, J., Jiang, XL., Deng, M. et al. Tree Genetics & Genomes (2016) 12: 90. doi:10.1007/s11295-016-1048-1
Part of the following topical collections:
  1. Gene Conservation

Abstract

Montane cloud forests (MCFs), with their isolated nature, offer excellent opportunities to study the long-term effects of habitat fragmentation and the impacts of climate change. Quercus arbutifolia is a rare oak in MCFs of southern China and Vietnam. Its isolated populations, small population size and unique ecological niche make this species vulnerable to climate change and habitat loss. In this study, we used chloroplast (cpDNA) and nuclear (ITS) DNA sequences to investigate genetic divergence patterns and demographic history of five of the six known populations of Q. arbutifolia. Considering its small population size and fragmentation, Q. arbutifolia has unexpectedly high genetic diversity. The time since the most recent common ancestor of all cpDNA haplotypes was c. 10.25 Ma, and the rapid diversification of haplotypes occurred during the Quaternary. The maximum clade credibility chronogram of cpDNA haplotypes suggests that the DM population (Daming Mountain, Guangxi province) diverged early and rapidly became isolated from other populations. The Pearl River drainage system may have been the main geographic barrier between DM and other populations since the late Miocene. ITS data suggests that population expansion occurred during the last interglacial of the Quaternary. The combined effects of pre-Quaternary and Quaternary climatic and geological changes were the main drivers to the current genetic diversity and distribution pattern of Q. arbutifolia. Because of the high between-population genetic differentiation and high within-population genetic diversity of Q. arbutifolia, conservation efforts should be implemented for all populations, but if conservation resources are limited, populations DM, YZ (Mang Mountain, Hunan province) and ZZ (Daqin Mountain, Fujian province) should have priority.

Keywords

Phylogeography cpDNA ITS Population genetics Endangered Quercus subgenus Cyclobalanopsis 

Supplementary material

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Fig. S1

The geographical distribution of the six known sites (populations) of Q. arbutifolia. Red dots represents the locations (GIF 995 kb)

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Fig. S2

Results of Bayesian cluster analysis with BAPS for K = 4 based on (a) cpDNA data and (b) ITS data. Each individual is represented by a thin vertical line. Black line separate the 5 investigated populations of Q. arbutifolia (see Table 1 for population names) (GIF 2556 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Shanghai Key Laboratory of Plant Functional Genomics and ResourcesShanghai Chenshan Botanical GardenShanghaiChina
  2. 2.Shanghai Chenshan Plant Science Research CenterChinese Academy of SciencesShanghaiChina
  3. 3.The Morton ArboretumLisleUSA