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Articles by Mingwang Zhang
Total Records ( 2 ) for Mingwang Zhang
  Mingwang Zhang , Mingzhou Li , Long Jin , Yan Li and Xuewei Li
  Tibetan pig is an endangered plateau type pig breed which distributed mainly in Qinghai-Tibetan Plateau. In present study, researchers analyzed 218 prior published partial mitochondrial D-loop sequences (415 bp) by using phylogenetic, network, mismatch distribution and Analysis of Molecular Variance (AMOVA) analysis to clarify the population differentiation and explore the relationships among populations from different geographical locations of Tibetan pigs. The results revealed a total of 43 haplotypes in 218 samples from seven Tibetan pig populations in which only one common Haplotype (H1) was shared by the seven populations. Haplotype diversity was high (0.889) whereas nucleotide diversity among all individuals was low (0.00534). It is notable that Hezuo Tibetan pigs have 19 unique haplotypes in total 24 haplotypes of 53 individuals with the highest nucleotide diversity (0.00765). Bayesian tree and median joining network procedures carried out on the data showed that seven Tibetan pig haplotypes were essentially indistinguishable except some unique haplotypes from Hezuo. The AMOVA analysis indicated that the genetic variation mainly occurred within populations (85.41%) but variance among populations was only 14.59%. The unimodal mismatch distribution of haplotypes, together with significant negative values of Fu’s FS and negative values of Tajima’s D suggest that a recent population expansion of Tibetan pig has been occurred in Diqing, Hezuo and total population.
  Mingwang Zhang , Guohua Yu , Dingqi Rao , Yimei Huang , Junxing Yang and Yan Li
  The taxonomic status of red knobby newt (Tylototriton shanjing) is under dispute. Molecular phylogenetic tree of Tylototriton verrucosus group was reconstructed based on 753 bp of partial mitochondrial cyt b gene sequence to determine species boundaries among the species in T. verrucosus group. The phylogeny result indicates that four major clades (clade I-IV) can be distinguished within Tylototriton verrucosus group. Clade I and IV consist of T. taliangensis and T. kweichowensis, respectively. Clade II consists of samples of T. shanjing derived from Yunnan of China, a form that researchers resurrect from its synonym under T. verrucosus. T. verrucosus haplotypes from Shan State of Myanmar and pet trade formed clade III. All populations of T. shanjing and T. verrucosus formed strongly supported (PP = 1.0) reciprocal monophyletic groups. The average uncorrected pairwise genetic distance (p-distance) of cyt b between these four clades ranges from 0.060-0.089 which is obviously higher than within these four major clades (0.001-0.014). Researchers propose that the T. shanjing should be a valid species rather than synonym of T. verrucosus.
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