Phylogeny and evolutionary history of Pinaceae updated by transcriptomic analysis

作  者:Ran JH*, Shen TT, Wu H, Gong X, Wang XQ*
影响因子:4.412
刊物名称:Molecular Phylogenetics and Evolution
出版年份:2018
卷:129  期:  页码:106-116

论文摘要:

Pinaceae comprises 11 genera, and represents the largest family of conifers with an extensive wild distribution in the Northern Hemisphere. Intergeneric relationships of Pinaceae have been investigated using many morphological characters and molecular markers, but phylogenetic positions of four genera, including CathayaCedrusNothotsuga and Pseudolarix, remain controversial or have not been completely resolved. To completely resolve the intergeneric relationships of Pinaceae, we conducted a comparative transcriptomic study of 14 species representing all Pinaceae genera. Multiple data sets, containing up to 6,369,681 sites across 4676 loci, were analyzed using concatenation and coalescent methods. Our study generated a robust topology, which divides Pinaceae into two clades, one (pinoid) including CathayaLarixPiceaPinus, and Pseudotsuga, and the other (abietoid) including AbiesCedrusKeteleeriaNothotsugaPseudolarix, and TsugaCathaya and Pinus form a clade sister to PiceaCedrus is sister to the remaining abietoid genera, and the two genera Nothotsuga and Tsuga form a clade sister to Pseudolarix. The discordant positions of CathayaCedrus and Pseudolarix in different gene trees could be explained by ancient radiation and/or molecular homoplastic evolution. The hybrid origin hypothesis of Nothotsuga is not supported. Based on molecular dating, extant Pinaceae genera diverged since about 206 Mya, earlier than the break-up of Pangea, and the divergence among the pinoid genera occurred earlier than the split among the abietoid genera. Moreover, our study indicates that two radiation events occurred in the evolution of Pinaceae genera, and some important morphological characters evolved multiple times based on ancestral state reconstruction.

全文链接:https://www.sciencedirect.com/science/article/pii/S1055790318301246?via%3Dihub