Genetic diversity in two threatened species in Vietnam:Taxus chinensis and Taxus wallichiana

查看全文 作　　者：Dinh Duy [1,2]Vu;Thi Tuyet Xuan [1,3]Bui;Minh Tam [2,3]Nguyen;Dinh Giap [4]Vu;Minh Duc [3]Nguyen;Van Thang [5]Bui;Xiaohua [1]Huang;Yi [1]Zhang

机构地区：[1]College of Forestry,Northwest A&F University,Yangling 712100,Shaanxi,People's Republic of China;[2]Vietnam National Museum of Nature,Vietnam Academy of Science and Technology(VAST),18 Hoang Quoc Viet,Cau Giay,Hanoi,Vietnam;[3]Institute of Ecology and Biological Resource(VAST),18 Hoang Quoc Viet,Cau Giay,Hanoi,Vietnam;[4]Institute of Natural Products Chemistry(VAST),18 Hoang Quoc Viet,Cau Giay,Hanoi,Vietnam;[5]Institute of Forest Biotechnology,Vietnam Forestry University,Xuan Mai,Chuong My,Hanoi,Vietnam

出　　处：《Journal of Forestry Research》索引2017年第28卷第2期,共8页

基　　金：supported by a research project(No.Z111021402)of Northwest A&F University;the Ministry of Natural Resources and Environment,Vietnam government,Hanoiand IDEA WILD equipment to Vu Dinh Duy,Bui Thi Tuyet Xuan 摘　　要：Taxus chinensis and T. wallichiana in have been threatened in their distribution areas in recent decades because of their over-exploitation and reduction and destruction of native habitats. Determining the genetic diversity in populations of the two species will provide guidelines for their protection and preservation. Two hundred and fifteen trees from six populations of T. chinensis and150 sampled trees of T. wallichiana were sampled. Six microsatellite primer pairs selected from 16 primer pairs were used to investigate genetic variation at the population and species levels. Five yielded polymorphic alleles, and among the 13 putative alleles amplified, 11 were polymorphic(accounting for 76.33 %).Shannon's information index(I) and percentage of polymorphic bands(PPB)(I = 0.202 and PPB = 67.22 % for T. chinensis; I = 0.217 and PPB = 65.03 % for T. wallichiana). Both species had low levels of genetic diversity(mean H_o= 0.107, H_e= 0.121 for T. chinensis; H_o= 0.095, H_e= 0.109 for T. wallichiana). Genetic differentiation among populations was higher(FST= 0.189) for T. chinensis and lower(0.156) for T.wallichiana, indicating limited gene flow(Nm) among populations for T. chinensis(0.68) and T. wallichiana(0.65).Variation among individuals of T. chinensis was 63.59 and73.12 % for T. wallichiana. Thus, the threatened status of the two conifers is related to a lack of genetic diversity. All populations are isolated in small forest remnants. An ex situ conservation site should be established with a new population for these species that comprises all the genetic groups for the best chance to improve their fitness under environmental stresses. 关键词：基因差异种类保存 SSR 标记 Taxus wallichiana Taxus chinensis

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Genetic diversity in two threatened species in Vietnam:Taxus chinensis and Taxus wallichiana

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