Search results for "nodule"

Rhizobium leguminosarum biovar viciae genotypes interact with pea plants in developmental responses of nodules roots and shoots

2007

International audience; The variability of the developmental responses of two contrasting cultivars of pea (Pisum sativum) was studied in relation to the genetic diversity of their nitrogen-fixing symbiont Rhizobium leguminosarum bv. viciae. A sample of 42 strains of pea rhizobia was chosen to represent 17 genotypes predominating in indigenous rhizobial populations, the genotypes being defined by the combination of haplotypes characterized with rDNA intergenic spacer and nodD gene regions as markers. We found contrasting effects of the bacterial genotype, especially the nod gene type, on the development of nodules, roots and shoots. A bacterial nod gene type was identified that induced very…

Pois protéagineux : cheminement de la recherche génétique pour la sélection des paramètres à prendre en compte pour l’amélioration de la stabilité du…

2013

Field Pea: development of genetic research for the selection of parameters to take into account to improve yield stability. Legumes were essential in rotations in the past, but they fell off during the 20th century. Maybe they will come back into favour in the 21st century thanks to its economy, agri-environment and food assets. Field Pea is the main crop of this family in France, but it remains underdeveloped because its unstable yield does not enable the farmers to ensure their income security. Therefore researchers should focus on yield stability. Modelling Pea remains difficult because of its indeterminate development. Parameters to take into account are many and their significance must…

Modélisation de la répartition des assimilats au sein du système racinaire chez le pois de printemps (Pisum sativum)

2014

leguminous plant, can fix atmospheric nitrogen through symbiosis with symbiotic bacteria of the genus Rhizobium. Yet the sensitivity of symbiotic N fixation to biotics and abiotics stresses leads to a significant yield and protein rate variability compared with cereals. A better understanding of C and N partitioning between roots and shoots according to the mode of N nutrition seems necessary to identify levers of yield stabilisation. In this context, the model PeaNod developed within INRA Dijon Ecophysiology team combines an architectural model of pea with an source-sink approach. The main objective of this work was to study the impact of competition between nodules and roots on roots arch…

Non destructive nodulated root phenotyping of pea recombinant inbred lines

2007

National audience

Combining plant genetic, ecophysiological and microbiological approaches to enhance nitrogen uptake in legumes

2009

International audience

Analyse écophysiologique de la récupération après un stress hydrique chez la légumineuse à graines Pisum sativum

2019

National audience; Le pois (Pisum sativum) possède la capacité de fixer l’azote atmosphérique via une symbiose avec des bactéries du sol, au sein de structures racinaires appelées nodosités, permettant ainsi de s’affranchir de l’apport d’engrais azotés pour sa culture. Cependant, la fixation symbiotique de l’azote est un processus très sensible au stress hydrique qui l’affecte négativement. Bien que la capacité d’une plante à récupérer après un stress hydrique puisse être déterminante pour sa survie et l’élaboration de son rendement, les mécanismes enclenchés lors de cette phase restent peu connus. Afin d’évaluer la capacité du pois à récupérer après un stress hydrique, notamment en termes …

Genetic diversity for partner choice in a core collection of pea accessions inoculated by a mix of five Rhizobium leguminosarum bv. viciae genotypes

2013

National audience

Variabilité génétique pour la morphologie du système racinaire du pois. Impact sur la nutrition azotée

2012

Genetic diversity of nodulated root structure and nitrogen nutrition in a core collection of pea

2013

Pea (Pisum sativum) is the third most important grain legume worldwide, and the increasing demand for protein-rich raw material for animal feed or human nutrition has led to a greater interest in this crop as a protein source. Moreover, legumes do not need nitrogen (N) fertilizers, thanks to their natural ability to use, as main N resource, the atmospheric N2 from symbiosis in nodules with Rhizobiaceae spp. However, N nutrition can still be a limiting factor of yield and seed quality in legumes because nodules are very sensitive to their local environment, in particular to nitrate, and root systems of N2 fixing legumes are poorly developed, which makes them unable to explore a large soil vo…

Effet d'un stress hydrique sur l'architecture du système racinaire d'une plante de pois

2013

EA GEAPSI CT2 (EA) EJ (EA)