Assessing specialized metabolite diversity in the cosmopolitan plant genus Euphorbia l.

Madeleine Ernst*, Louis Félix Nothias, Justin J.J. van der Hooft, Ricardo R. Silva, C. Haris Saslis-Lagoudakis, Olwen M. Grace, Karen Martinez-Swatson, Gustavo Hassemer, Luís A. Funez, Henrik T. Simonsen, Marnix H. Medema, Dan Staerk, Niclas Nilsson, Paola Lovato, Pieter C. Dorrestein, Nina Rønsted

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

45 Downloads (Pure)

Abstract

Coevolutionary theory suggests that an arms race between plants and herbivores yields increased plant specialized metabolite diversity and the geographic mosaic theory of coevolution predicts that coevolutionary interactions vary across geographic scales. Consequently, plant specialized metabolite diversity is expected to be highest in coevolutionary hotspots, geographic regions, which exhibit strong reciprocal selection on the interacting species. Despite being well-established theoretical frameworks, technical limitations have precluded rigorous hypothesis testing. Here we aim at understanding how geographic separation over evolutionary time may have impacted chemical differentiation in the cosmopolitan plant genus Euphorbia. We use a combination of state-of-the-art computational mass spectral metabolomics tools together with cell-based high-throughput immunomodulatory testing. Our results show significant differences in specialized metabolite diversity across geographically separated phylogenetic clades. Chemical structural diversity of the highly toxic Euphorbia diterpenoids is significantly reduced in species native to the Americas, compared to Afro-Eurasia. The localization of these compounds to young stems and roots suggest a possible ecological relevance in herbivory defense. This is further supported by reduced immunomodulatory activity in the American subclade as well as herbivore distribution patterns. We conclude that computational mass spectrometric metabolomics coupled with relevant ecological data provide a strong tool for exploring plant specialized metabolite diversity in a chemo-evolutionary framework.

Original languageEnglish
Article number846
JournalFrontiers in Plant Science
Volume10
Number of pages15
ISSN1664-462X
DOIs
Publication statusPublished - 2019

Keywords

  • Coevolution
  • Computational metabolomics
  • Euphorbia
  • Immunomodulatory testing
  • Specialized metabolites

Cite this

Ernst, M., Nothias, L. F., van der Hooft, J. J. J., Silva, R. R., Saslis-Lagoudakis, C. H., Grace, O. M., ... Rønsted, N. (2019). Assessing specialized metabolite diversity in the cosmopolitan plant genus Euphorbia l. Frontiers in Plant Science, 10, [846]. https://doi.org/10.3389/fpls.2019.00846