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Light sensing, absorption, and derived metabolism in photosynthetic organisms

Welcome to the Photosynthesis team

Published on 27 April 2019
Team leader

 Giovanni Finazzi
PhD, CNRS Research Director

Address - Contact

Laboratoire Physiologie Cellulaire & Végétale
CEA-Grenoble
17 avenue des Martyrs
38 054 Grenoble cedex 09
France
Phone: 33(0)4 38 78 41 84

Secretary:
Tiffany Guyonnet
Phone: +33 (0) 4 38 78 04 80
Fax: +33 (0) 4 38 78 50 91



Members of the team



Guillaume Allorent, 33 (0)4 38 78 66 63, Post Doc (HFSP)
Fabien Chevalier, 33 (0)4 38 78 34 84, CNRS Assistant Engineer
Florence Courtois, 33 (0)4 38 78 35 26, Assistant Professor of University Grenoble Alpes
Gilles Curien, 33 (0)4 38 78 66 63, CNRS Researcher - Biography
Davide Dal Bo, 33 (0)4 38 78 35 26, PhD student
Johan Decelle, 04 38 78 28 69, Chaire UGA - Biography
Giovanni Finazzi, 33 (0)4 38 78 41 84, CNRS Research Director - Biography
Cécile Giustini, 33 (0)4 38 78 35 26, INRA Assistant Engineer
Erika Gugliermo, Apprenticeship student
Michel Matringe, 33 (0)4 38 78 41 84, INRA Research Director
Claire Seydoux 33 (0)4 38 78 23 64, PhD student
Clarisse Uwizeye, 33 (0)4 38 78 23 64, PhD student


Former members of the team - Alumni

Maria Aguila Ruiz Sola, Post Doc (LabEx GRAL, ANR)
Pauline Gloaguen, Post Doc (LabEx GRAL, ANR)
Marcel Kuntz, CNRS Research Director
Angeliki Tsichla, Research Engineer
Gaëlle Villain, CNRS Assistant Engineer
Serena Flori, 2013-2016, PhD student (Marie Curie ITN Accliphot)
Leonardo Magneschi, 2014-2016, Post Doc (Total New Energies)
Valeria Villanova, 2013-2016, PhD student (Marie Curie ITN Accliphot)
Christelle Richard, 2015, Technician (Total New Energies)
Martino Tomizioli, 2011-2014, PhD student
Elisa Dell’Aglio, 2010-2013, PhD student (Program CEA Irtelis)

Short period students:
Erika Gugliermo, Apprenticeship student
Mathieu Desbuisson, 2016, Master 1 student
Fabrizio Iacono, 2016, Master 2 student (Erasmus) University of Pisa, Italy
Martina Ratti, 2016, Master 2 student, University of Ancona, Italy
Jean Alinei, 2015, ENSe3 Grenoble-INP
Stéphanie Chezeaud, 2015, M2 student (New Technologies for Energy, CEA) Mines ParisTech
Loïc Cusant, 2015, Master 1 student, Montpellier University
Stefan Kreida, 2014, Master 2 student (Erasmus) University of Uppsala, Sweden
Dimitra Karageorgou, 2013, Master 2 student (Erasmus) University of Ioaninna, Greece
Vanessa Checchetto, 2013, visiting PhD student, University of Padova, Italy


About us

The Light, Photosynthesis & Metabolism (LPM) team (founded in 2015) belongs to the Cell & Plant Physiology Laboratory of the Interdisciplinary Research Institute of Grenoble.
OUR MAIN RESEARCH FOCUS is to understand the adaptive responses of phototrophs to different trophic lifestyles (phototrophy, mixotrophy, symbiosis) and environmental constraints.
Our MAIN MODELS are the microalgae Phaeodactylum (diatom), Galdieria (rhodophyte), Phaeocystis (Haptophyte), Chlamydomonas (Chlorophyte), and the plant Arabidopsis.
OUR MAIN APPROACH is the ‘next-generation physiology’ that combines photophysiology with integrative metabolism at different scales, from the cell to the protein level.
We are a multidisciplinary team with complementary skills (molecular biology, imaging, biochemistry, modeling) and different backgrounds (eco-physiology, cell biology, biophysics, mathematics).
The LPM team belongs to the CEA (French Alternative Energies and Atomic Energy Commission), the CNRS (French National Centre for Scientific Research), the INRA (French National Institute for Agricultural Research) and the University of Grenoble Alpes. The LP&M team collaborates with many teams in France and abroad.

Research Topics


1. Acclimation to light colours
Sunlight is a substrate for photosynthesis, a developmental signal and a harmful energy source; Using the chlorophyte Chlamydomonas reinhardti, we study the link between these light functions, studying responses to UV-B light via genetics, molecular biology, biochemistry, bioinformatics and biophysics approaches.

2. Photosynthetic electron flow
Photosynthetic organisms need to plug light energy fluxes to the needs of the Calvin Benson cycle, by adjusting the rate of electron flow. We test the hypothesis that ion fluxes (K+ and H+) do this job by altering the proton motive force (PMF), which in turn controls light energy conversion, electron flow and ATP synthesis.

3. Bioenergetic Interactions
Optimizing the ATP/NADPH ratio is mandatory for CO2 assimilation in plants and marine phytoplankton. Plants do this via chloroplast-localized ATP-generating processes (cyclic electron flow), while diatoms -ecologically successful phytoplankton members- have adopted energy exchanges between plastids and mitochondria. Is this mechanism a paradigm for optimization of photosynthesis in the ocean?

4. Metabolic bases of symbioses
Photosymbiosis between single-celled hosts and microalgae is common in the oceanic -especially in oligotrophic waters- but poorly characterized. Using state of the art subcellular imaging we address the following questions: How does the heterotrophic host take control of the photosynthetic cell? What are the structural and metabolic mechanisms of this control?

We are generating knowledge which, in particular in the case of unicellular microalgae, can also be exploited for domestication (growth in photobioreactor, production of metabolites of economic interest). (See industrial partnerships)

The team gathers scientists from different countries (France, Greece, Italy) complementary skills (molecular biology, cell biology, biochemistry, biophysics) and research backgrounds to study fundamental biological questions with a truly multidisciplinary approach.
The Photosynthesis team collaborates with many teams in France and abroad
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Key-words
Photosynthesis, redox control, signalling, bioenergetics, biophysics, kinetic modelling.