Search results for "Racines"

Short term adaptive response of symbiotic N2 fixation in pea to root pruning of half the root system, linked to the availability of carbon assimilates

2014

Symbiotic N fixation of legumes is very sensitive to environmental stresses, like pea pests damaging nodulated roots. However, the impact on their N uptake capacity and plant growth has not been studied so far.We analyzed the adaptive response symbiotic N2 fixation and plant growth of pea wild type Frisson and hypernodulating mutants P64, P118 and P121 mutated respectively on genes SYM28, SYM29 and NOD3 to root pruning of half the root system at the end of the vegetative stage. The adaptive responses of pea: cv. Frisson and 3 of its hypernodulating mutants were compared under varying carbon supplies from photosynthesis.At 380 ppm, mutant P118 showed the lowest decrease of the specific activ…

Réponses adaptatives du Pois protéagineux à une perturbation de la fixation symbiotique d'azote en relation avec le métabolisme carboné

2013

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…

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 …

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

2013

EA GEAPSI CT2 (EA) EJ (EA)

"Vivre dans le délai". Jacob Taubes et les racines apocalyptiques de l'Occident

2010

International audience

RPB1 as a marker gene to analyze communities of arbuscular mycorrhizal fungi (Glomeromycota)

2014

The influence of agricultural practice on the diversity of Arbuscular mycorrhizal fungi (AMF, Glomeromycota) continues to be an important research question as these mutualistic symbionts are known to improve plant growth and soil quality. To this day, studies of community diversity in AMF have exclusively been based on nuclear ribosomal gene regions, such as the small and large subunits and the ITS region. In the Glomeromycota, these regions show high intra-organism polymorphism, which can seriously complicate interpretation of diversity data. We chose the rpb1 gene as an alternative marker as this putative single-copy gene has been shown to be monomorphic within fungal isolates but shows a…