Phylogeny of section Leuce (Populus, Salicaceae) inferred from 34 chloroplast DNA fragments

作   者：Dongsheng Wang, Zhaoshan Wang, Shuhui Du, Jianguo Zhang
期刊名称：Biochemical Systematics and Ecology
影响因子：0.929
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关键词：Chloroplast DNA fragments Phylogeny Populus Rapid radiation Salicaceae Section Leuce
论文摘要：
Section Leuce Duby (Populus, Salicaceae) is an important taxon among the 6 sections in the
genus Populus. Although biological and taxonomic studies has greatly improved our understanding
of this section, the phylogenetic relationships among the species of section
Leuce remain uncertain due in part to the limited number of loci for analysis. In the present
study, 34 chloroplast DNA fragments, which included 22 new chloroplast DNA fragments
as well as 12 chloroplast DNA fragments used previously, were applied to explore interspecific
relationships in this section. The inclusion of additional chloroplast DNA fragments
recovered a well-resolved phylogeny of section Leuce. According to our phylogenetic tree,
(1) we can confirm the monophyly of section Leuce and two sister clade subdivisions; (2) P.
tremula L. shows closer affinity to P. davidiana Dode than other species, which has previously
been a source of debate; (3) P. tremuloides Michx. and P. grandidentata Michx. form
sister subclades; and (4) we propose that the previously unresolved phylogeny of section
Leuce is most likely due to insufficient data. Our phylogenetic analysis successfully resolved
the phylogeny of section Leuce using a sufficient dataset. This study provides an important
foundation for evolutionary studies and for the effective utilization of the wild germplasm
resources of section Leuce.