Abstract Detail

Phylogeny and evolution of angiosperms in the era of next generation sequencing

Yi, Ting-Shuang [1], Yao, Gang  [2], Jin, Jian-Jun [3], Soltis, Douglas [4], SOLTIS, PAMELA S. [5], Smith, Stephen [6], Moore, Michael J. [7], Li, De-Zhu [8].

Plastid phylogenomic insights into the evolution of Caryophyllales.

Caryophyllales are a large, diverse angiosperm clade that includes 40 families and 12,500 species. Collectively, members of the clade grow on all continents and in all terrestrial biomes and often occupy extreme habitats (e.g. xeric, salty). The order is characterized by many taxa with unusual adaptations including carnivory, halophytism, and multiple origins of C4 photosynthesis. However, deep phylogenetic relationships within the order have long been problematic due to putative rapid divergence. To resolve the deep-level relationships of Caryophyllales, we performed phylogenomic analyses of all 40 families of Caryophyllales. Molecular dating analyses were conducted, and the correlation between plastid structural changes and rates of molecular substitution was estimated. We recovered a well-resolved, well-supported tree that was largely congruent with previous estimates of Caryophyllales relationships and that provided improved support for the position of several key families. The crown age of Caryophyllales was estimated at ca. 114.4 million years ago (Ma), with periods of rapid divergence in the mid-Cretaceous. A strong, positive correlation between nucleotide substitution rate and plastid structural changes was detected. Our study highlights the importance of broad taxon sampling in phylogenomic inference and provides a firm basis for future investigations of molecular, morphological, and ecophysiological evolution in Caryophyllales.

1 -
2 - Kunming Institute of Botany, Chinese Academy of Sciences, Germplasm Bank of Wild Species, No. 132, Lanhei Road,, Kunming, Yunnan, 650201, China
3 - Kunming Institute of Botany, Chinese Academy of Sciences, Germplasm Bank of Wild Species, 132 Lanhei Rd., Kunming, Yunnan, 650201, China
4 - University of Florida, Biology, Gainesville, FL
5 - Florida Museum of Natural History, University of Florida, 1659 Museum Road, Gainesville, Florida, 32611, United States
6 - University of Michigan, Ecology and Evolutionary Biology, 2071A Kraus Natural Science Building, Ann Arbor, MI, 48109, USA
7 - Oberlin College, Department Of Biology, 119 Woodland St., Science Center K111, Oberlin, OH, 44074, United States
8 - Kunming Institute of Botany, Chinese Academy of Sciences, Germplasm Bank of Wild Species, 132 , Kunming , Yunnan, 650201, China

gene loss
molecular dating
Rapid radiation
substitution rate.

Presentation Type: Symposium Presentation
Abstract ID:529
Candidate for Awards:None

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