Chin J Plant Ecol ›› 2013, Vol. 37 ›› Issue (1): 52-60.DOI: 10.3724/SP.J.1258.2013.00006

Special Issue: 生物多样性

• Review • Previous Articles     Next Articles

Genetic diversity of central and peripheral populations of Toona ciliata var. pubescens, an endangered tree species endemic to China

LIU Jun1, JIANG Jing-Min1,*(), ZOU Jun2, XU Jin-Liang3, SHEN Han3, DIAO Song-Feng1   

  1. 1Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang, Zhejiang 311400, China
    2Laizhou National Forest Farm, Nanping, Fujian 353004, China; and 3Kaihua County Forest Farm, Kaihua, Zhejiang 234300, China
  • Received:2012-08-27 Accepted:2012-11-28 Online:2013-08-27 Published:2013-01-15
  • Contact: JIANG Jing-Min


Aims Our objective was to elucidate the genetic diversity of central and peripheral populations of Toona ciliata var. pubescens and whether there existed “central-peripheral hypothesis” in these populations.
Methods We analyzed 384 individuals from nine natural populations using eight pairs of polymorphic SSR primers.
Important findings The mean number of observed and expected number of alleles in peripheral populations were not lower, but higher than those in central populations. Common widespread and rare local alleles were distributed in all populations, but common local and rare widespread alleles were found in five and three populations, respectively. Both the observed and expected heterozygosities were higher compared to the central populations. The coefficient of gene differentiation of the peripheral populations was 0.3045, which was significantly higher than that of the central populations (FST = 0.152). The gene flow between central populations was greater than one, but less than one between peripheral populations. These indicated that frequent gene flow existed between central populations, while terrain and fragmentation prevented gene flow among peripheral populations. Mantel test indicated no relationship was found between genetic and geographical distance of T. ciliata var. pubescens.

Key words: central populations, endangered tree species, genetic diversity, peripheral populations, Toona ciliata var. pubescens