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5th Meeting on Molecular Mechanisms in Nitrogen-Fixing Root Endosymbioses - Toulouse, 12-13 October 2017

5th Meeting on Molecular Mechanisms in Nitrogen-Fixing Root Endosymbioses
The 5th meeting on Molecular Mechanisms in Nitrogen-Fixing Root Endosymbioses will be held in Toulouse at "L'amphi Toulouse Garonne" from Thursday 12 October at 13:45 to Friday 13 October at 16:15.

* * * Registrations are closed * * *

Programme flyer download (pdf) >>>


Thursday, 12th October

13:45                     Meeting introduction Catherine Masson and Julie Cullimore

14:00 - 15:40       Session 1. Chairperson: Florian Frugier

14:00 - 14:40

Pierre-Marc DELAUX (LRSV, Toulouse) - Evolution of the nitrogen-fixing root-nodule symbiosis.

14:40 - 15:00

Albin TEULET (LSTM, Montpellier) - A cocktail of type III effectors controls the symbiotic interaction between Aeschynomene and non-photosynthetic Bradyrhizobia.

15:00 - 15:20

Joëlle FOURNIER (LIPM, Toulouse) - In vivo imaging of Frankia intercellular infection in the actinorhizal species Discaria trinervis.

15:20 - 15:40

Florian LAMOUCHE (I2BC, Paris-Saclay) - Analysis of candidate genes involved in bacteroid differentiation in Aeschynomene-Bradyrhizobium symbioses.

15:40 - 16:10       Coffee break

16:10 - 17:30       Session 2. Chairperson: Valérie Hocher

16:10 - 16:30

Emanuele BIONDI (LCB, Marseille) - Bacteroid and cell cycle regulation in Sinorhizobium meliloti: divide or not divide?

16:30 - 16:50

Benoit DAUBECH (LIPM, Toulouse) - noeM, a novel rhizobial gene involved in symbiosis with Mimosa pudica.

16:50 - 17:10

Pascal RATET (IPS2, Paris-Saclay) - Role of the legume NBCL genes in symbiosis.

17:10 - 17:30

Maimouna CISSOKO (LSTM, Montpellier) - Identification et caractérisation des molécules signal impliquées dans la symbiose actinorhizienne Casuarina-Frankia.

17:30 - 19:00        Poster session and aperitif

20:00                    (Self-organized) Dinner in Toulouse downtown

Friday, 13th October

09:00 - 10:20       Session 3. Chairperson: Fernanda de Carvalho-Niebel

09:00 - 09:20

Jérémy MOREAU (IPS2, Paris-Saclay) - How do ribonucleases III impact small RNA dynamics and epigenetic regulations during development of nitrogen fixing nodules in the model legume Medicago truncatula?

09:20 - 09:40

Clare GOUGH (LIPM, Toulouse) - Roles of Medicago truncatula NFP.

09:40 - 10:00

Quentin BARRIERE (I2BC, Paris-Saclay) - Integrated roles of BclA and DD-carboxypeptidase 1 in Bradyrhizobium differentiation within NCR-producing and NCR-lacking root nodules.

10:00 - 10:20

Philippe NORMAND (Ecologie Microbienne, Lyon) - Early steps of the Alnus glutinosa/Frankia alni interactions studied through transcriptomics and proteomics.

10:20 - 10:50       Coffee break

10:50 - 12:10        Session 4. Chairperson: Pierre Frendo

10:50 - 11:10

Antoine BERGER (ISA, Sophia-Antipolis) - Contribution of nitrate reductases and hemoglobins to nitric oxide (NO) balance in the Medicago truncatula–Sinorhizobium meliloti symbiosis.

11:10 - 11:30

Marie-Françoise JARDINAUD (LIPM, Toulouse) - MtEFD, an ever surprising ERF transcription factor involved in nodule differentiation

11:30 - 11:50

Hervé SENTENAC (BPMP, Montpellier) - Réponses des poils absorbants à l'environnement abiotique et biotique analysées à l'aide d'un programme de phénotypage automatique.

11:50 - 12:10

Lionel MOULIN (IPME, Montpellier) RNA-seq analysis of wheat roots and leaves colonized by Azospirillum and Burkholderia reveals common mechanisms of plant response to beneficial bacteria.

12:10 - 14:00        Lunch

14:00 - 15:20       Session 5. Chairperson: Lionel Moulin

14:00 - 14:20

Camille SYSKA (ISA, Sophia-Antipolis) - Role of bacterial Toxin/Antitoxin systems in the nitrogen-fixing symbiosis Rhizobia-Legumes.

14:20 - 14:40

Jean-François ARRIGHI (LSTM, Montpellier) - Towards the identification of the genetic determinants of the Nod factor-independent symbiosis in Aeschynomene evenia.

14:40 - 15:00

Carole LAFFONT (IPS2, Paris-Saclay) - Systemic pathways regulating symbiotic nodulation.

15:00 - 15:20

Jacques BATUT (LIPM, Toulouse) - Autoregulation of infection in the S. meliloti - Medicago symbiosis.

15:20 - 16:00       Session 6.

                                      Discussion on future actions of SymbiFix and concluding remarks.



Ait Salem Elhosseyn, IPS2

Approche génétique du contrôle de l'immunité au cours de la symbiose


Barrière Quentin, I2BC

Molecular analysis of BclA, an antimicrobial peptide transporter involved in bacteroid differentiation during Aeschynomene/Bradyrhizobium symbiosis


Bensmihen Sandra, LIPM

A new Medicago truncatula IAA/AUX involved in symbiotic stimulation of lateral root formation?


Berger Antoine, ISA

Hemoglobins, Nitrate Reductases and Nitric Oxide in the Medicago truncatula - Sinorhizobium meliloti symbiosis


Boncompagni Eric, ISA

Thioredoxin 1 s1 is essential for bacterial terminal differentiation in the nitrogen-fixing symbiosis in Medicago truncatula


Cazalé Anne-Claire, LIPM

NO-mediated tyrosine nitration of Sinorhizobium meliloti proteins


Cissoko Maimouna, LSTM

Identification and characterization of signalling molecules involved in actinorhizal symbioses


Daubech Benoit, LIPM

Spatio-temporal control of mutualism in legumes helps spread symbiotic nitrogen fixation


Debellé Frédéric, LIPM

A forward genetic screen identifies two novel mutants of Medicago truncatula with altered Nod factor structure recognition


Garmier Marie, IPS2

Role of salicylic acid and NPR proteins in the Medicago truncatula - Sinorhizobium medicae symbiotic interaction


Gherbi Hassen, LSTM

Signalling and crosstalk in the actinorhizal root nodule symbioses


Kelner Audrey, LIPM

New GECO calcium sensors for visualizing symbiotic calcium responses in vivo


Lamouche Florian, I2BC

Transcriptomic dissection of differentiated bacteroid physiology in the Aeschynomene - Bradyrhizobium symbiosis


Lefebvre Benoit, LIPM

Conserved LysM-RLK function for arbuscular mycorrhizal symbiosis in non-legumes and for nitrogen-fixing symbiosis in legumes


Liu Shengbin, IPS2

Role of the NBCL proteins in legume symbiosis and abscission


Marchetti Marta, LIPM

Emergence of divergent evolutionary patterns during experimental evolution of legume symbiont


Niebel Andreas, LIPM

Characterization of a potential target of the transcription factor NF-YA1 in Medicago truncatula


Proust Hélène, IPS2

How does DCL3 impact small RNA dynamics and epigenetic regulations during development of nitrogen fixing nodules in the model legume Medicagotruncatula?


Rongsawat Thanyakorn, BPMP

Réponses des poils absorbants à l'environnement abiotique et biotique, et développement d'un programme de phénotypage automatique


Rovere Martina, ISA

ERF-VII family as key player in oxygen sensing and hypoxia adaptation in roots and nodules of Medicago truncatula


Sauviac Laurent, LIPM

Stress-induced DNA double-strand break NHEJ repair in Sinorhizobium meliloti: a function in lateral gene transfer?


Sentenac Hervé, BPMP

Vers un phénotypage automatisé du développement des zones pilifères et de l'archi-tecture racinaire, en vue de l'analyse des réponses racinaires à des rhizobia chez le blé


Tan Sovanna, IPS2

Characterization of Type-B Response Regulator transcription factor targets acting in early symbiotic nodulation


Xue Shuanghong, LCB

Screening cell cycle mutants showing enhanced symbiotic properties in Sinorhizobium meliloti


Yang Li, ISA

Regulation of senescence-specific proteases during the nitrogen-fixing symbiosis in Medicago truncatula

Programme flyer download (pdf) >>>

More informations will be available contacting Catherine Masson or Julie Cullimore.

See more about L'amphi Toulouse Garonne:

The organizing committee



Research unit

Catherine MASSON


LIPM - INRA/CNRS, Toulouse



LIPM - INRA/CNRS, Toulouse


PhD student

LIPM - INRA/CNRS, Toulouse


PhD student

LIPM - INRA/CNRS, Toulouse

Pierre-Marc DELAUX


LRSV - CNRS/Univ. Toulouse 3 Paul Sabatier, Toulouse

The scientific committee


Research unit


ISA - UNS/INRA/CNRS, Sophia Antipolis


LIPM - INRA/CNRS, Toulouse

Catherine MASSON

LIPM - INRA/CNRS, Toulouse


LIPM - INRA/CNRS, Toulouse


LSTM - INRA/IRD/CIRAD/SupAgro/UM2, Montpellier

Valérie HOCHER

LSTM - INRA/IRD/CIRAD/SupAgro/UM2, Montpellier

Pierre-Marc DELAUX

LRSV - CNRS/Univ. Toulouse 3 Paul Sabatier, Toulouse


I2BC - CNRS/CEA/Univ. Paris Sud, Gif-sur-Yvette


IPS2 - CNRS/INRA/Univ. Paris Sud/Univ Evry/Univ. Paris-Diderot/Sorbonne Paris-Cité/Univ. Paris-Saclay, Orsay


IPME - IRD/CIRAD/UM, Montpelli

With financial support from

RégionOccitanie rectangle