Search results for "Root"
showing 10 items of 1237 documents
Nodulating symbiotic bacteria and soil quality
2005
Chapitre 9 : Plant microbe interactions and soil quality Partie : 9-2; International audience
Medicago species affect the community composition of arbuscular mycorrhizal fungi associated with roots
2007
National audience; The symbiosis between plants and arbuscular mycorrhizal fungi (AMF) is ancient and involves 80% of terrestrial plant families. The symbiotic association between AMF and plants was described to be non specific. However, AMF were reported to influence plant community diversity and productivity. On the other way, the effect of plant genotypes belonging to closely related species on AMF diversity has not been explored so far. The aim of this work was to assess the impact of four different Medicago species, M. laciniata, M. murex, M. polymorpha and M. truncatula cv. Jemalong J5, on the composition of AM fungal community, when cultivated in a silty-thin clay soil (Mas d’Imbert,…
Comparative effect of inorganic N on plant growth and N2 fixation of ten legume crops
2018
International audience; [pas de résumé]
Nodulated root imaging within the high throughput plant phenotyping platform (PPHD, INRA, Dijon)
2014
Présentation orale/ Communication avec actes
Caractérisation expérimentale de la variabilité phénotypique du système racinaire nodulé de génotypes contrastés de pois (Pisum sativum L.), en phase…
2013
One of the challenges in plant breeding pea is to offer adapted genotypes to non-optimal environmental conditions. One of the factors limiting the agronomic performance of the pea is related to the environment plant sensitivity. Nodulated root system traits determine this sensitivity. The characterization of phenotypic traits combinations of the nodulated root system in different peas genotypes is interesting to suggest new plant breeding traits. The objective of this work was to experimentally characterize the phenotypic variability of the nodulated root system of 10 pea genotypes. The analysis was conducted under controlled conditions. The plants were grown in the absence of nitrates. Phe…
Effect of rhizosphère bacteria and endomycorrhizal fungi on the growth of Christmas rose (Helleborus niger L.)
2010
International audience; Micropropagated and vegetative (by rhizome cuttings) propagated plants of Christmas rose ( Helleborus niger L.) were tested for their responses to the inoculation with microorganisms in order to optimize root growth and development. In our experiment, plants were inoculated with arbuscular endomycorrhizal fungi or/and Agrobacterium radiobacter . The investigation indicated that inoculation with A. radiobacter had significantly positive effect on growth and development of plants multiplicated by in vitro techniques as compared to the dual inoculation. This study indicates that, biotization can be beneficial to plant growth in in vitro plant production systems but inoc…
Study of the adaptative response of N2 fixation to a root pruning in peas using environmental and genetic variations
2013
International audience; Pea is the first grain legume grown in Europe for its seeds rich in protein. As a legume, it has the ability to fix atmospheric N2 by the symbiosis with Rhyzobium bacteria. Still, N nutrition can be a limiting factor of pea yield, due to a high sensitivity of symbiotic N2 fixation to biotic stress like Aphanomyces that leads to root rots. The consequences of root damage on nodules and their N2 fixing activity and the possible adaptive response of plants still remain unknown. Root pruning could be an innovative experimental way to study these effects, resulting both in nodules and N2 deprivation. Still, researches described the adaptive responses of plants to a local …
Quantification of nitrogen fluxes and explanatory plant traits during a two year legume-cereal rotation
2018
National audience; A better understanding of how plant growth, N nutrition and symbiotic nitrogen fixation (SNF) are influenced by soil inorganic N availability, for a wide range of legume species, is crucial to optimise legume productivity, N2 fixation, while limiting environmental risks such as N leaching. A comparative analysis was performed for ten legume crops, grown in a field experiment and supplied with four levels of N fertiliser. Dry matter, N concentration and SNF were measured. Parallely, root traits were studied in a greenhouse experiment. For most species, inorganic N inputs had little effect on plant growth and N nutrition. SNF was negatively affected by soil inorganic N avai…
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…
New perspectives and approaches in plant growth-promoting rhizobacteria research
2007
International audience; In the context of increasing international concern for food and environmental quality, use of Plant Growth-Promoting Rhizobacteria (PGPR) for reducing chemical inputs in agriculture is a potentially important issue. PGPR are root-colonizing bacteria that exert beneficial effects on plant growth and development, but they can be also employed in the control of plant pathogens, for enhancing the efficiency of fertilizers, and for degrading xenobiotic compounds. This book provides an update by renowned international experts on the most recent advances in the ecology of these important bacteria, the application of innovative methodologies for their study, their interactio…