作者：Zhaoshan
Wang, Shuhui Du, Dongsheng Wang, Yanfei Zeng, Jianguo Zhang*
期刊：Plos One
影响因子：3.73
时间：2014年8月12日
卷.期.页码：DOI:
10.1371/journal.pone.0103645
摘要：
Populus (Salicaceae)
is one of the most economically and ecologically important genera of forest
trees. The complex reticulate evolution and lack of highly variable orthologous
single-copy DNA markers have posed difficulties in resolving the phylogeny of
this genus. Based on a large data set of nuclear and plastid DNA sequences, we
reconstructed robust phylogeny of Populus using parsimony, maximum
likelihood and Bayesian inference methods. The resulting phylogenetic trees
showed better resolution at both inter- and intra-sectional level than previous
studies. The results revealed that (1) the plastid-based phylogenetic tree
resulted in two main clades, suggesting an early divergence of the maternal
progenitors of Populus; (2) three advanced sections (Populus, Aigeiros
and Tacamahaca) are of hybrid origin; (3) species of the section Tacamahaca
could be divided into two major groups based on plastid and nuclear DNA data,
suggesting a polyphyletic nature of the section; and (4) many species proved to
be of hybrid origin based on the incongruence between plastid and nuclear DNA
trees. Reticulate evolution may have played a significant role in the evolution
history of Populus by facilitating rapid adaptive radiations into
different environments.