Evolution of the cooperation and consequences of a decrease in plant diversity on the root symbiont diversity
type: Dataset
contact point: Organization
  fn: CCSD
keyword: diversite
keyword: mutualisme
keyword: cooperation
keyword: sdvsalife-sciences-q-bioagricultural-sciences
keyword: carbon-allocation
keyword: evolution
keyword: ecosystem-functioning
keyword: sequencage-de-masse
keyword: champignons-mycorhiziens-a-arbuscules
keyword: ssu-rrna-gene
keyword: diversity
keyword: secondary-metabolites
keyword: arbuscular-mycorrhizal-fungi
keyword: metabolites-secondaires-ssu-rrna
keyword: plant
keyword: theses
keyword: allocation-de-carbone
keyword: amplicon-mass-sequencing
keyword: infoeu-reposemanticsdoctoralthesis
keyword: communautes
keyword: fonctionnement-des-ecosystemes
keyword: plante
keyword: mutualism
keyword: sdvbvlife-sciences-q-biovegetal-biology
keyword: communities
landing page: https://theses.hal.science/tel-00867233
description: The mutualism between plants and arbuscular mycorrhizal fungi is extremely widespread (~ 80% of plants are colonized by these organisms) and ancient (over 450 million years ago). This symbiotic relationship is an essential component of healthy ecosystem functioning and productivity, and is strongly involved in the cycle of two key elements: phosphorus and carbon. Maintaining this mutualism has become especially important in the current context of a biodiversity loss. One goal of this thesis was to understand the stability of the mutualism. I first focused on nutrient exchange, testing whether plant host and fungal symbionts are able to discriminate among partners, and allocate more resources to those individuals providing more nutrients. I then explored the possibility of the host-plant involvement in the protection of mycorrhizal symbionts via a transfer of secondary metabolites into fungal hyphae. We introduced a new hypothesis suggesting that chemcial protection from the plant is positively correlated with the level of cooperation (i.e. nutrient transfer) of the fungal symbiont. I then moved from the individual to the community by studying the effects of decreasing plant diversity on the diversity of root symbionts. To this aim, I utilized molecular analyzes and innovative tools, such as high throughput sequencing. To further facilitate the study of the obtained sequences and other fungal sequences, I worked with colleagues to create a database ‘Phymyco-DB’ which was released to the public in 2012. Finally, I discuss the implication of the mycorrhizal mutualism in the context of current agricultural systems and propose new trajectories to manage these systems. This PhD project provides new insights on how plant and AM fungi interactions work and how they shape ecological processes and evolutionary trajectories in natural and agricultural ecosystems. These points are of major importance to develop a more ecologically intensive agriculture. The project has provided…
identifier: NNT: 2013REN1S045
issued: 2026-05-09T13:48:14.463820
language: en
modified: 2026-05-09T13:48:14.463825

test_moissonnage_selune
type: Agent

Evolution of the cooperation and consequences of a decrease in plant diversity on the root symbiont diversity
type: Distribution
access URL: https://theses.hal.science/tel-00867233
format: HTML
issued: 2026-05-09T13:48:14.468285
modified: 2026-05-09T13:48:14.441158