Hybrid Origins and Homoploid Reticulate Evolution within Heliosperma (Sileneae, Caryophyllaceae)-A Multigene Phylogenetic Approach with Relative Dating

被引:111
作者
Frajman, Bozo [1 ,2 ]
Eggens, Frida [2 ]
Oxelman, Bengt [2 ,3 ]
机构
[1] Univ Ljubljana, Biotech Fac, Dept Biol, SI-1000 Ljubljana, Slovenia
[2] Uppsala Univ, Dept Systemat Bot, Evolutionary Biol Ctr, SE-75236 Uppsala, Sweden
[3] Univ Gothenburg, Dept Plant & Environm Sci, SE-40530 Gothenburg, Sweden
基金
瑞典研究理事会;
关键词
BEAST; homoploid hybridization; incongruence; lineage sorting; PATHd8; r8s; relative dating; RPA2; RPB2; RPD2; MOLECULAR EVOLUTION; DIVERGENCE TIMES; SILENE CARYOPHYLLACEAE; CONCERTED EVOLUTION; ABSOLUTE RATES; NUCLEAR RDNA; GENE TREES; CHLOROPLAST; SPECIATION; HISTORY;
D O I
10.1093/sysbio/syp030
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
We used four potentially unlinked nuclear DNA regions from the gene family encoding the second largest subunit of the RNA polymerases, as well as the psbE-petG spacer and the rps16 intron from the chloroplast genome, to evaluate the origin of and relationships within Heliosperma (Sileneae, Caryophyllaceae). Relative dates of divergence times are used to discriminate between hybridization and gene duplication/loss as alternative explanations for topological conflicts between gene trees. The observed incongruent relationships among the three major lineages of Heliosperma are better explained by homoploid hybridization than by gene duplication/losses because species branching events exceed gene coalescence times under biologically reasonable population sizes and generation times, making lineage sorting an unlikely explanation. The origin of Heliosperma is complex and the gene trees likely reflect both reticulate evolution and sorting events. At least two lineages have been involved in the origin of Heliosperma, one most closely related to the ancestor of Viscaria and Atocion and the other to Eudianthe and/or Petrocoptis.
引用
收藏
页码:328 / 345
页数:18
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