Allozymes Genetic Diversity of Quercus mongolica Fisch in China  

作　　者：LI Wenying GU Wanchun 

机构地区：[1]Research Institute of Forestry Policy and Information, Chinese Academy of Forestry （CAF） ,Beijing 100091, P.R.China [2]Research Institute of Forestry, CAF,Beijing 100091, P.R.China

出　　处：《Chinese Forestry Science and Technology》2006年第4期68-75,共8页中国林业科技（英文版）

摘　　要：A gel electrophoresis method was used to study the genetic diversity of 8 Quercus mongolica populations throughout its range in China. Eleven of 21 loci from 13 enzymes assayed were polymorphic. Q. mongolica maintained low level of genetic variation compared with the average Quercus species. At the species level, the mean number of alleles per locus (A) was 1.905, the percentage of polymorphic loci (P) was 52.38%, the observed heterozygosity (Ho) was 0.092 and the expected heterozygosity (He) was 0.099. At the population level, the estimates were A =1.421, P =28.976%, Ho = 0.088, He =0.085. Genetic differentiation (Gst was high among populations, it was 0.107. According to the UPGMA cluster analysis based on the genetic distance, 4 populations located in northeast and 2 populations in southwest of the geographical distribution are classified into 2 subgroups, but there was no clear relationship between genetic distance and geographic distance among populations. The low level of genetic diversity of Q. mongolica might be related to the long-term exploitation as economic tree species in history are comparatively seriously disturbed and damaged by human beings, and most of the existing stands are secondary forests.A gel electrophoresis method was used to study the genetic diversity of 8 Quercus mongolica populations throughout its range in China. Eleven of 21 loci from 13 enzymes assayed were polymorphic. Q. mongolica maintained low level of genetic variation compared with the average Quercus species. At the species level, the mean number of alleles per locus （A） was 1.905, the percentage of polymorphic loci （P） was 52.38%, the observed heterozygosity （Ho） was 0.092 and the expected heterozygosity （He） was 0.099. At the population level, the estimates were A =1.421, P =28.976%, Ho = 0.088, He =0.085. Genetic differentiation （Gst was high among populations, it was 0.107. According to the UPGMA cluster analysis based on the genetic distance, 4 populations located in northeast and 2 populations in southwest of the geographical distribution are classified into 2 subgroups, but there was no clear relationship between genetic distance and geographic distance among populations. The low level of genetic diversity of Q. mongolica might be related to the long-term exploitation as economic tree species in history are comparatively seriously disturbed and damaged by human beings, and most of the existing stands are secondary forests.

关 键 词：Quercus mongolica ALLOZYME genetic diversity 

分 类 号：S792.18[农业科学—林木遗传育种]