文献类型：期刊文献

英文题名：Major Chromosomal Rearrangements Distinguish Willow and Poplar After the Ancestral "Salicoid" Genome Duplication

作者：Hou, Jing[1] Ye, Ning[1] Dong, Zhongyuan[1] Lu, Mengzhu[2] Li, Laigeng[3] Yin, Tongming[1]

第一作者：Hou, Jing

通信作者：Yin, TM[1]

机构：[1]Nanjing Forestry Univ, Coll Forestry, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing, Jiangsu, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Beijing, Peoples R China;[3]Chinese Acad Sci, Shanghai Inst Biol Sci, Inst Plant Physiol & Ecol, Natl Key Lab Plant Mol Genet, Shanghai, Peoples R China

年份：2016

卷号：8

期号：6

起止页码：1868-1875

外文期刊名：GENOME BIOLOGY AND EVOLUTION

收录：;Scopus(收录号：2-s2.0-85015093799);WOS:【SCI-EXPANDED(收录号:WOS:000378633900020)】；

基金：This work is supported by the National Basic Research Project [2012CB114505], and the Natural Science Foundation of China [31561123001, 31570662]. It is also enabled by the Program for Innovative Research Team of the Educational Department of China and in Universities of Jiangsu Province, and the Priority Academic Program Development (PAPD) program and the Doctorate Fellowship Foundation of Nanjing Forestry University.

语种：英文

外文关键词：chromosomal rearrangement; genome duplication; genome divergence; Populus; Salix

摘要：Populus (poplar) and Salix(willow) are sister genera in the Salicaceae family. In both lineages extant species are predominantly diploid. Genome analysis previously revealed that the two lineages originated from a common tetraploid ancestor. In this study, we conducted a syntenic comparison of the corresponding 19 chromosome members of the poplar and willow genomes. Our observations revealed that almost every chromosomal segment had a parallel paralogous segment elsewhere in the genomes, and the two lineages shared a similar syntenic pinwheel pattern for most of the chromosomes, which indicated that the two lineages diverged after the genome reorganization in the common progenitor. The pinwheel patterns showed distinct differences for two chromosome pairs in each lineage. Further analysis detected two major interchromosomal rearrangements that distinguished the karyotypes of willow and poplar. Chromosome I of willow was a conjunction of poplar chromosome XVI and the lower portion of poplar chromosome I, whereas willow chromosome XVI corresponded to the upper portion of poplar chromosome I. Scientists have suggested that Populus is evolutionarily more primitive than Salix. Therefore, we propose that, after the ''salicoid'' duplication event, fission and fusion of the ancestral chromosomes first give rise to the diploid progenitor of extant Popuius species. During the evolutionary process, fission and fusion of poplar chromosomes I and XVI subsequently give rise to the progenitor of extant Salix species. This study contributes to an improved understanding of genome divergence after ancient genome duplication in closely related lineages of higher plants.