Solanaceae Source

A global taxonomic resource for the nightshade family

Sept 4th, 2020 - Edeline Gagnon

Next SOL Seminar Online will be presented by Edeline Gagnon on Implication of phylogenomic analyses for macroevolutionary patterns in the large  genus Solanum (Solanaceae)

Abstract. The increasing availability of phylogenomic data is revealing incongruent topologies in gene trees between and even within genomes. Some of these incongruences indicate hard polytomies that are due to underlying biological processes may remain impossible to fully resolve. The incongruent topologies and hard polytomies could mean that multiple, alternative topologies will have to be used to explore macro-evolutionary patterns. Here, I investigate these questions in the large and economically important genus Solanum L. which, with c. 1,248 accepted species, is one of the ten largest flowering plant genera. To provide an evolutionary framework for the large research community working on the genus, our lab built a new supermatrix phylogeny comprising 61% of all accepted species (750 spp.), based on two nuclear (ITS and WAXY) and seven plastid markers. To assess whether the recovered topology is robust, we compared results with full plastome analysis of 141 species and nuclear genome target-capture analysis of 39 species. All datasets contained species from all the major clades of Solanum. I also explored the effect of taxon sampling, missing data, phylogenetic analyses, and data partition scheme on the recovered species tree. Results show discordance in the relationships between major clades. The latter have a minor impact on the taxonomic classification of major and minor clades but might affect the interpretation of trait analyses across the genus. I briefly discuss how this will impact future plans on phylogenetic comparative analyses using trait and occurrence data from Solanaceae Source which contains over 88,000 geo-referenced and taxonomically verified herbarium specimens for Solanum.

When? Friday 4th September, 4 pm (GMT+1)

The zoom link to join the meeting is Meeting ID: 943 3314 6166, password: Solanaceae

Watch this talk here:

Friday, September 4, 2020 - 16:00
Fri, 2020-09-04 13:23 -- rocio

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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith