Annual meeting: 2018
Fields-Topics: P1 Molecular and Cellular
Type of talk: Fellows Speed Presentation
Graduated in Biological Sciences, I am interested in the plasticity of plants for adapting to stress conditions. During my PhD at the State University of Campinas (Brazil), I studied the involvement of post-transcriptional regulations on glucose- and ABA-promoted responses using Arabidopsis as a model organism. While an experimental setup was developed for efficiently identifying potential targets of mRNA decay control in response to these two signals, specific glucose-responsive miRNAs controlling Arabidopsis early development were revealed. As Post-Doctorate Fellow, I started to explore the kinetics of ABA-promoted changes in gene expression. This research is pursued as collaboration with researchers from the Brazilian institution. I then accepted the invitation to work for one year as Senior Researcher at the Russian Institute of Radiology and Agroecology (Russian Federation). Having access to the unique populations of Scots pine chronically exposed to radiation because of the Chernobyl NPP accident in 1986, I conducted high-throughput transcriptomic studies intending to unravel the mechanisms that allow plants to endure such an extreme condition. Now, as an AgreenSkills+ Fellow, my focus has returned to Arabidopsis, working on central regulators of growth and metabolism (TOR and SnRK1 pathways) and their interplay with the bZIP transcription factors.
Plant growth and metabolism are modulated by two functionally antagonistic signalling pathways which are evolutionary conserved in eukaryotes: the Target of Rapamycin kinase (TOR) and the Sucrose non-fermenting 1-Related Kinase 1 (SnRK1) pathways. The switch between activation/deactivation of TOR or SnRK1 pathways is triggered by energetic signals, which are linked to the photosynthetic activity, but also depends on responses to biotic and abiotic stresses. Both pathways lead to transcriptional reprogramming involving, among others, the basic leucine zipper (bZIPs) transcription factors (TFs), which in turn control the metabolism of RFOs (raffinose family oligosaccharides). RFOs accumulate in response to a variety of stresses and may be involved in stress resistance. Using Arabidopsis as a model organism, this project investigates the potential interaction nodes between TOR and SnRK1 pathways involving bZIP TFs. Understanding the connections between TOR and SnRK1 signalling pathways, two central growth modulators perceiving the energetic and stress conditions to control accumulation of sugars like RFOs, is of interest within a context of global climate changes and the need of sustainable alternatives for our current agriculture production model.
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