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Chinese Journal of Plant Ecology >
Genetic diversity of central and peripheral populations of Toona ciliata var. pubescens, an endangered tree species endemic to China
Received date: 2012-08-27
Accepted date: 2012-11-28
Online published: 2013-01-15
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.
LIU Jun, JIANG Jing-Min, ZOU Jun, XU Jin-Liang, SHEN Han, DIAO Song-Feng . Genetic diversity of central and peripheral populations of Toona ciliata var. pubescens, an endangered tree species endemic to China[J]. Chinese Journal of Plant Ecology, 2013 , 37(1) : 52 -60 . DOI: 10.3724/SP.J.1258.2013.00006
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