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PHY-PIF interactome in tomato

Grant number: 19/25708-2
Support type:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): September 01, 2020
Effective date (End): February 28, 2021
Field of knowledge:Biological Sciences - Botany
Principal researcher:Maria Magdalena Rossi
Grantee:Ricardo Ernesto Bianchetti
Supervisor abroad: Andreas Hiltbrunner
Home Institution: Instituto de Biociências (IB). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Research place: University of Freiburg, Germany  
Associated to the scholarship:17/24354-7 - Effects of phytochrome-dependent temperature perception in tomato fruit metabolism through epigenetic regulation, BP.PD


Tomato is a species of great economical and nutritional importance. Since sugars and health-promoting metabolites are synthesized in the plastids, factors regulating plastid abundance, structure and activity directly affect tomato nutritional quality. Among them, light and temperature are key ambient factors regulating the biogenesis and activity of this organelle. In this context, the manipulation of light perception and signaling has been explored as an effective tool to alter simultaneously distinct classes of nutritional compounds derived from plastid metabolism in tomato. A recent work from our group shows that temperature negatively affects carotenogenesis in tomato leaves and fruits in a phytochrome B2 (SlPHYB2)-dependent manner, however the molecular mechanism underneath remains to be explored. Previous studies in Arabidopsis thaliana suggest that AtPHYB perceives light and temperature signals and regulates photo- and thermoresponses by affecting the levels of phytochrome-interacting factor 4 (AtPIF4) transcription factor. Since tomato SlPIF4 controls seedling thermomorphogenesis and fruit carotenogenesis, we propose that SlPHYB2 acts via SlPIF4 to regulate fruit metabolism in response to temperature. To test this hypothesis, we will investigate the protein-protein interactions between tomato PHYs and PIFs. The results obtained will allow a better understanding of the molecular mechanisms that control temperature response and the development of biotechnological tools for the simultaneous manipulation of PHYs and PIFs for temperature resistance breeding. (AU)

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