Search results for "medicago"

Vers la validation fonctionnelle du gène WEE1 dans l’acquisition de la résistance au stress abiotique chez des protéagineux

2017

Plant genotype: a lever in the interactions between plant and its associated rhizosphere microbiome

2018

International audience; In the context of highly pressured agricultural production using low levels of inputs, cropping strategies could take advantage of existing plant-microbiome interactions that can improve both plant growth and health. We believe that plant genetics can provide some clues to better understand the mechanisms underlying microbiome recruitment by the plant.The aims of this work were (i) to assess plant genotype effect on the rhizosphere bacterial communities in relation to the plant nutritional strategies for a core collection of 155 genotypes of Medicago truncatula and (ii) to highlight the genetic determinisms potentially associated in these interactions. To achieve the…

Genes encoding transcription factors in Glomus intraradices and their expression at the appressoria stage of arbuscular mycorrhiza interactions

2007

International audience; Molecular pathways governing the life cycle of arbuscular mycorrhizal (AM) fungi and their symbiotic interactions with root tissues are not yet fully understood. Most studies fo fungal responses to host plants have targeted developmental stages before root contact (germinating spores), or after root colonization (intraradical mycelium). We are focusing on the early cell events of appressoria contact with the root surface which are essential to the successful outcome of the AM symbiosis. Recent monitoring of Glomus intraradices gene expression at this stage has revealed differential fungal responses to roots of host and non-host (Myc- mutants) M. truncatula (Seddas et…

Effect of Arbuscular Mycorrhiza establishment on the genetic structure and functionality of bacterial communities in the rhizosphere of Medicago trun…

2007

Bacterial communities associated with (i) M. Truncatula J5 (Myc+/Nod+) and TRV48 (Myc+/Nod-), and with (ii) M. Truncatula TRV25 (Myc-/Nod-) were compared. The genetic structure of communities was characterized with an A-RISA DNA fingerprint. The genetic structures of communities associated with mycorrhizal and non-mycorrhizal roots were significantly different. Bacteria belonging to the Oxalobacteraceae and Comamonadaceae families were preferentially associated with mycorrhizal roots. The genetic diversity of cultured bacteria belonging to these groups was analysed by BOX-PCR. The diversity of isolates from mycorrhizal and non-mycorrhizal roots was significantly different. The functionality…

Protein storage accumulation at mid-embryogenesis in Medicago truncatula and Pisum sativum

2005

National audience

Etude de l’interaction « Plante x Communauté microbienne du sol » chez l’espèce modèle Medicago truncatula

2010

National audience

Identification de transporteurs de sucres marqueurs de la mycorhize à arbuscules

2012

Seed coat structure in Medicago truncatula : histological changes associated with seed development.

2007

National audience

Phosphorus tolerance of an hypermycorrhizal mutant of Medicago truncatula

2010

International audience

Déterminisme génétique de la composition protéique des graines de légumineuses et de sa plasticité vis-à-vis de l’environnement

2018

Les légumineuses sont capables de produire des graines riches en protéines sans apport d’engrais azoté grâce à la symbiose racinaire avec des bactéries du genre rhizobium. Riches en lysine, ces protéines sont utilisées pour l’alimentation des animaux d’élevage et en nutrition humaine. Afin de promouvoir la culture des légumineuses, il est nécessaire d’optimiser et de stabiliser la qualité de cette fraction protéique. L’objectif de ma thèse est de mettre en évidence les déterminismes génétiques sous-jacents à la teneur et à la composition protéique des graines de légumineuses ainsi qu’à la plasticité de ces composantes vis-à-vis de l’environnement. Afin de répondre à cet objectif, l’approche…