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《Acta Botanica Boreali-Occidentalia Sinica》 2017-07
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Genetic Variation Structure of the Endangered Plant Amygdalus pedunculata

LI Xiaochen;MA Songmei;College of Science,Shihezi University;  
In this study,we analyzed genetic diversity and population genetic structure of 8natural distribution populations(total 105individuals)based on ITS1-ITS4 sequence of endangered plant Amygdalus pedunculata,to darify the geographical distribution and genetic diversity of A.pedunculata.The results showed that:(1)the length of ITS1-ITS4 fragments is 583bp;13variation sites and 8haplotypes were obtained.Total genetic diversity was 0.727,average genetic diversity within populations was 0.564,haplotype diversity and nucleotide diversity ranged from 0.182 to 0.636 and 0.000 6to 0.006 3,respectively;(2)Genetic differentiation among these populations was not very significant.AMOVA analysis show that33.65% of total variation occurred among populations and 66.35% occurred within population.Mean gene flow among the populations was 0.986.A significant phylogeography structure was observed(GST =0.225,NST=0.362,P0.05).Results of neutrality tests and mismatch distribution curves show that A.pedunculatadid not experience recent population expansion.(3)Haplotypes of the MJ network and ML tree show that populations of Inner Mongolia and Shaanxi clustered into two genetic lineages.
【Fund】: 国家自然科学基金(41261011 41561007);; 旱区作物逆境生物学国家重点实验室开放基金(CSBAA2015014)
【CateGory Index】: S662.9
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