文献类型：期刊文献

英文题名：Genetic structure of Populus hybrid zone along the Irtysh River provides insight into plastid-nuclear incompatibility

作者：Zeng, Yan-Fei[1] Zhang, Jian-Guo[1,2] Duan, Ai-Guo[1] Abuduhamiti, Bawerjan[3]

第一作者：曾艳飞

通信作者：Zhang, JG[1];Zhang, JG[2]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Forestry Adm, Key Lab Tree Breeding & Cultivat,State Key Lab Tr, Beijing, Peoples R China;[2]Nanjing Forestry Univ, Colaborat Innovat Ctr Sustainable Forestry Southe, Nanjing, Jiangsu, Peoples R China;[3]Forest Res Inst Altai Reg, Xinjiang, Peoples R China

年份：2016

卷号：6

外文期刊名：SCIENTIFIC REPORTS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000378078000001)】；

基金：This work was supported by the Fundamental Research Funds for the Central Non-profit Research Institution of CAF (CAFYBB2016ZX001-2) and the Special Fund for Forest Scientific Research in the Public Welfare (201004035). We thank Ai-min Liu and his colleagues from the Flatland Forestry Center of the Haba River in Xinjiang for help with the sampling.

语种：英文

摘要：In plants, the maintenance of species integrity despite hybridization has often been explained by the co-adaption of nuclear gene complexes. However, the interaction between plastid and nuclear sub-genomes has been underestimated. Here, we analyzed the genetic structure of a Populus alba and P. tremula hybrid zone along the Irtysh River system in the Altai region, northwest China, using both nuclear microsatellites and plastid DNA sequences. We found high interspecific differentiation, although the hybrid P. x canescens was prevalent. Bayesian inference classified most hybrids into F1, followed by a few back-crosses to P. alba, and fewer F2 hybrids and back-crosses to P. tremula, indicating a few introgressions but preference toward P. alba. When plastid haplotypes in parental species were distinct, P. x canescens carried the haplotypes of both parents, but showed significant linkage between intraspecific haplotype and nuclear genotypes at several microsatellite loci. Selection, rather than migration and assortative mating, might have contributed to such plastid-nuclear disequilibria. By removing later-generated hybrids carrying interspecific combinations of haplotype and nuclear genotypes, plastid-nuclear incompatibility has greatly limited the gene exchange between P. alba and P. tremula via backcrossing with hybrids, demonstrating a significant association between plastid haplotype and the proportion of nuclear admixture.