Genomic footprints of repeated evolution of CAM photosynthesis in tillandsioid bromeliads:
- Author(s)
- La Harpe M de, M Paris, J Hess, MHJ Barfuss, ML Serrano-Serrano, A Ghatak, P Chaturvedi, W Weckwerth, W Till, N Salamin, CM Wai, R Ming, C Lexer
- Abstract
The adaptive radiation of Bromeliaceae (pineapple family) is one of the most diverse among Neotropical flowering plants. Diversification in this group was facilitated by several ‘key innovations’ including the transition from C3 to CAM photosynthesis. We used a phylogenomic approach complemented by differential gene expression (RNA-seq) and targeted metabolite profiling to address the patterns and mechanisms of C3/CAM evolution in the extremely species-rich bromeliad genus Tillandsia and related taxa. Evolutionary analyses at a range of different levels (selection on protein-coding genes, gene duplication and loss, regulatory evolution) revealed three common themes driving the evolution of CAM: response to heat and drought, alterations to basic carbohydrate metabolism, and regulation of organic acid storage. At the level of genes and their products, CAM/C3 shifts were accompanied by gene expansion of a circadian regulator, re-programming of ABA-related gene expression, and adaptive sequence evolution of an enolase, effectively linking carbohydrate metabolism to ABA-mediated stress response. These changes include several pleiotropic regulators, which facilitated the evolution of correlated adaptive traits during a textbook adaptive radiation.
- Organisation(s)
- Department of Botany and Biodiversity Research
- External organisation(s)
- Université de Fribourg, Université de Lausanne, Michigan State University, University of Illinois at Urbana-Champaign
- DOI
- https://doi.org/10.1101/495812
- Publication date
- 12-2018
- Austrian Fields of Science 2012
- 106012 Evolutionary research, 106044 Systems biology, 106013 Genetics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/7077825d-dbf0-4c78-94bc-f217a1bc9b11