Search results for "rhizobium"
showing 10 items of 67 documents
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…
Comparaison de l’efficience de cinq souches de Rhizobium sur 18 génotypes de pois
2014
Legume-rhizobium association leads to the production of nodules on plant roots, in which atmospheric nitrogen is caught by the bacteria and exchanged for plant carbohydrates. This symbiotic association is probably the best way to increase nitrogen fertilization without using biological or chemical input. Symbiosis mechanisms between both species are thus a challenge for the current research. Previous studies have shown that rhizobia are not equally selected by the different pea genotypes. The objective of this study was to assess if peas select the most efficient bacterial strain. In order to answer this question, we sowed 18 pea genotypes and inoculated each of them with five different rhi…
A mathematical method for determining genome divergence and species delineation using AFLP.
2002
The delineation of bacterial species is presently achieved using direct DNA-DNA relatedness studies of whole genomes. It would be helpful to obtain the same genomically based delineation by indirect methods, provided that descriptions of individual genome composition of bacterial genomes are obtained and included in species descriptions. The amplified fragment length polymorphism (AFLP) technique could provide the necessary data if the nucleotides involved in restriction and amplification are fundamental to the description of genomic divergences. Firstly, in order to verify that AFLP analysis permits a realistic exploration of bacterial genome composition, the strong correspondence between …
Characterization of rhizobia nodulating chickpea in Tunisia
2001
Cent cinquante rhizobia nodulant le pois chiche (Cicer arietinum L.) ont ete isoles a partir de sols echantillonnes dans differentes regions de Tunisie. L'inoculation de la plante hote avec ces isolats montre une variabilite dans le temps d'apparition des premieres nodosites. Cinq isolats induisent des nodosites deux semaines apres inoculation alors que pour les 145 isolats restants les nodosites ne sont observees qu'apres au moins quatre semaines. L'etude par PCR/RFLP de l'ADNr 16S a permis de rattacher les isolats du premier groupe a l'espece Mesorhizobium mediterraneum et ceux du second groupe a l'espece Sinorhizobium medicae. La position taxonomique des isolats a ete confirmee par leurs…
Physiological characterization of Bradyrhizobium japonicum liquid inoculants stored for many years
1998
National audience
Combining plant genetic, ecophysiological and microbiological approaches to enhance nitrogen uptake in legumes
2009
International audience
Recherche des meilleurs couples pois-rhizobia. Premiers résultats et perspective
2019
Prod 2019-83g BAP GEAPSI INRA; National audience; La culture de légumineuses, et en particulier du pois, présente le double intérêt de permettre une production de graines à haute valeur nutritionnelle sans nécessité d’un apport d’engrais azoté. Cependant, la nutrition azotée du pois, et en particulier la fixation symbiotique de l’azote atmosphérique, peut être insuffisante dans certains environnements et limiter ainsi le rendement de la culture. L’établissement de la symbiose entre pois et rhizobium nécessite une reconnaissance mutuelle spécifique entre les deux partenaires, et une coordination de l'expression de nombreux gènes, indispensable à la mise en place des importantes modifications…
Evaluation de bactéries d’intérêt pour l’agriculture ou l’environnement (biofertilisant) ; cas des inoculants à Bradyrhizobium japonicum, bactérie fi…
2014
EA MERS CT3; Master
Identification et évaluation de bactéries d’intérêt pour l’agriculture
2012
Ce rapport de Stage est Confidentiel EA MERS CT3; Licence