Abstract Detail

From the backbone to diversification: unraveling the evolutionary history of Ericales

Pizzardo, Raquel [1], Goncalves, Deise [2], MedellĂ­n-Zabala, Diana [3], Chanderbali, Andre [4], Soltis, Douglas [5], Soltis, Pamela [6], Smith, Stephen [7], Dick, Christopher [8].

Phylogenetic incongruence in an important tropical tree family, Sapotaceae, based on target sequence captured nuclear and plastome genes.

With around 1,250 species and 58 genera, Sapotaceae ranges throughout tropical America, Africa, Australasia, and Pacific, and is usually restricted to lowland tropical rainforests. It consists of woody plants ranging from shrubs and understory trees to the canopy-emergent trees of the rainforest. The taxonomy of the family is unstable. During the past few years, many incongruences between phylogeny and classification in Sapotaceae have been noted, as well as alternative topologies for species-level phylogenies. In the present study we generate a higher sampled Sapotaceae phylogeny aiming to compare nuclear and plastid data with the goal of exploring the extent to which subfamily and genus relationships corroborate previously published results. We used target sequence capture data from the Angio353 probe for 199 taxa, and 78 plastome protein-coding genes for 157 taxa of Sapotaceae with representatives from all the subfamilies described for the family. The concatenated maximum likelihood molecular phylogeny was constructed using IQ-TREE (v. 1.6) considering GTR+G and partition models, and 1000 bootstrap replicates. We found that the plastome and nuclear phylogenies are not in full agreement, presenting pointed discordances in known ambiguous taxa (e.g., Pouteria genus). The nuclear phylogeny moderately recovered the three subfamilies of Sapotaceae, showing relatively high support for Sapotoideae but not for Chrysophyloideae. However, these relationships were more ambiguous in the plastome phylogeny. Besides, both phylogenies are inconsistent with the current morphological classification. Our analysis agreed with previous studies that placed Chrysophyllum, Pouteria, and Pradosia, all from the Chrysophylloideae subfamily, as polyphyletic taxa. Their classification was based on combinations of morphological characters that appear to have been lost multiple times and present high levels of homoplasy. All these characteristics are fundamental to understanding why Sapotaceae present so many different classifications. Our work points to this aspect and the need for further studies of phylogeny, biogeographic history, and the evolution of morphological characters in this ecologically and economically important family.

1 - University of Michigan, 1105 N University Ave, Ann Arbor, MI, 48109, USA
2 - University Of Michigan, Ecology And Evolutionary Biology, 800 Fuller St. APT #16, Ann Arbor, MI, 48104, United States
3 - University of Michigan, Ecology and Evolutionary Biology, 1105 N University Ave, Ann Arbor, MI, 48109, USA
4 - University Of Florida, Florida Museum Of Natural History, Gainesville, FL, 32611, USA
5 - University of Florida, Florida Museum of Natural History,, 3215 Hull Road, P. O. Box 2710, Gainesville, FL, 32611, USA
6 - University Of Florida, Florida Museum Of Natural History, Gainesville, FL, 32611.0, United States
7 - 1105 N University Ave, Ann Arbor, MI, 48109, United States
8 - Ecology And Evolutionary Biology, 830 N University, 2019 Natural Science, Ann Arbor, MI, 48109, United States


Presentation Type: Colloquium Presentations
Number: C3005
Abstract ID:542
Candidate for Awards:None

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