Important information

Due to the COVID-19 pandemic and the current health crisis, and to ensure the safety and well-being of our delegates, the organizing committee of the ISSX/holobiont3 congress has decided to postpone the meeting originally scheduled in Lyon for this summer (July 18-23, 2021).

Instead, the meeting will take place from July 25th to 29th, 2022. Please stay tuned, registration will be opened soon!

Most of the invited speakers have already accepted to come next year, and we thank them warmly! We are currently working to maintain the dynamism of our scientific community. In particular, we will regularly post on our website several teasers from the keynote speakers, so that you can get a taste of next year’s program! We are also working on a street science program, which will be rolled out this year for open science and for advertisement of our coming congress.


Welcome to ISS 10/Holobiont 3

The first symbiotic relationships were described in the 19th century. Nearly 150 years later, immense research efforts have highlighted that symbiotic relationships are ubiquitous and have particularly important ecological and evolutionary consequences. But considering individuals as holobionts, or ecosystems that combine host and symbiotic entities, is an on-going revolution.

Within this framework, the 10th Congress of the International Symbiosis Society will be held in conjunction with the 3rd edition of the International Conference on Holobionts at the Palais des Congrès of Lyon (France) from July 25 to 29, 2022. This joint congress will provide a unique opportunity to present the most exciting and recent discoveries in the fields of symbiosis and holobiont research.

During this meeting, we will give a special emphasis on symbiosis in the Anthropocene era. Faced with the challenges generated by global upheavals, be they societal, medical, or environmental, it is indeed essential to understand the impact of these changes on symbioses, and also to foresee how symbioses may allow to cope with these challenges in the future of our biosphere.

The program has been designed to cover a wide range of fundamental and applied topics in current symbiotic and holobiotic research. We are delighted to welcome prestigious guest speakers at the forefront of research, working on various types of organisms (e.g., virus, bacteria, protists, invertebrates, plants and humans).

This major international meeting will be held in Lyon, the French capital of gastronomy and wine, a UNESCO World Heritage, and the birthplace of cinema with Lumière brothers. Along with the exciting scientific and societal programs, we expect to welcome between 500 and 700 participants, from more than 30 countries.


Preliminary list of symposia

  • Symbiosis in Anthropocene 1 - One Health and the holobiont
  • Symbiosis in Anthropocene 2 - From susceptibility to resilience in global change
  • Symbiosis in Anthropocene 3 - Symbioses for alternative agricultures
  • Coevolution in holobionts
  • Evolution of mutualistic associations: cooperation, cheating and competition
  • Symbiosis ecology: from ecosystem functionning to ecological networks
  • Development and symbiosis
  • Metabolic exchanges and gene networks in holobionts
  • Immunity and symbiosis
  • Symbiosis and reproduction
  • Symbiosis and behavior in animals and humans
  • Invertebrate symbionts: from endosymbiosis to animal farming
  • Plant holobiont: physiology, defense and applications for agriculture
  • Virus interactions in the holobionts
  • Marine holobionts: from littoral to deep sea
  • Photosymbioses: from lichens to xanthelles and plastids
  • Emerging tools and approaches to study symbiosis (omics, microscopy, field, modelling...)
  • Teaching symbiosis: methods and concepts

Keynote speakers

  • Gabriele Berg, Graz, Austria
  • Paola Bonfante, Turin, Italy
  • Joel Doré, Paris, France
  • Kevin Foster, Oxford, UK
  • Paolina Garbeva, Wageningen, Netherlands
  • Ute Hentschel, Kiel, Germany
  • Martin Kaltenpoth, Mainz, Germany
  • Michael Khul, Copenhagen, Denmark
  • Purificación López-García, Paris, France
  • Margaret McFall-Ngai, Hawaii, USA
  • Nancy Moran, Texas, USA
  • Irene Newton, Indiana, USA
  • Siobhain O'Mahony, Cork, Ireland
  • Jillian Petersen, Vienna, Austria
  • Corné Pieterse, Utrecht, Netherlands
  • Forest Rohwer, San Diego, USA
  • Joel Sachs, Riverside, USA
  • Marc-André Selosse, Paris, France


Steering committee

Federica Calevro
Feth el Zahar Haichar
Aziz Heddi
Natacha Kremer
François Lallier
Christophe Mougel
Laurence Mouton
Fabrice Not
Rita Rebollo
Marc-André Selosse
Jean-Christophe Simon
Claire Valiente-Moro
Fabrice Vavre
Anna Zaidman-Rémy



The 10th congress of the ISS/Holobiont 3 meeting will be held July 25-29, 2022 at the "Centre des congrès de Lyon" in France.




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