Skip to Main content Skip to Navigation
Theses

Impact de la diversité génétique des communautés prairiales sur la production et la biodiversité du sol : Implications pour l'amélioration des plantes

Abstract : Many studies highlight a positive effect of species diversity on plant community productivity and associated biodiversity. But genetic diversity effect on species community is still poorly studied despite the rare studies showing a positive effect with prospects for application in the field of plant breeding. It is in this context that this thesis examines the genetic diversity effect on grassland communities and associated soil biodiversity. This thesis is based on a real situation via an evaluation design of grassland mixtures installed by and in a plants breeding company. The major results of this thesis are a positive effect of the species genetic diversity on mixture biomass production, especially during drought episodes, and on species abundance equilibrium. These positive effects seem to be the result of a niche differentiation of species which is at the basis of species complementarity in ecology. Temporal complementarity of species has been demonstrated by asynchronous growth dynamics, but also by a complementarity for light acquisition via selection and plasticity mechanisms. Finally, genetic diversity effects have been observed on microbial diversity with plants feedbacks. In view of these results, it appears that genetic diversity occupies a central role in the assembly and structure of plant and microbial communities, leading us to consider how it could be integrated into plant breeding program.
Complete list of metadatas

Cited literature [306 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-02461075
Contributor : Abes Star :  Contact
Submitted on : Thursday, January 30, 2020 - 2:21:08 PM
Last modification on : Sunday, September 27, 2020 - 3:31:36 AM

File

2019-Meilhac-Julien-These.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-02461075, version 1

Collections

Citation

Julien Meilhac. Impact de la diversité génétique des communautés prairiales sur la production et la biodiversité du sol : Implications pour l'amélioration des plantes. Biodiversité et Ecologie. Université de Poitiers, 2018. Français. ⟨NNT : 2018POIT2302⟩. ⟨tel-02461075⟩

Share

Metrics

Record views

89

Files downloads

89