Interaction between Aeschynomene and photosynthetic Bradyrhizobium: An enigmatic Nod-independent symbiotic process
Nodule formation in legume plants was assumed to be exclusively initiated by the binding of bacterial host-specific lipochitooligosaccharidic Nod factors to kinase-like receptors of the plant. Recently, sequence analysis of the genomes of two photosynthetic Bradyrhizobium strains (ORS278 and BTAi1), symbiotic of some Aeschynomene species, overturned this dogma because these bacteria lack the canonical nodulation genes (nodABC) involved in the synthesis of Nod factors [1]. This indicates that certain rhizobia use another mechanism to trigger nodule organogenesis in legumes. The most relevant characteristic of the photosynthetic Bradyrhizobium genomes will be presented. To identify the bacterial genes involved during this symbiosis, we individually screened a large Tn5 mutant library (20,000 mutants) of Bradyrhizobium ORS278 strain for their inability to induce nodules on Aeschynomene or to fix nitrogen. Results of this screening strategy will also be discussed. (Texte intégral)
Main Authors: | Bonaldi, Katia, Cartieaux, Fabienne, Fardoux, Joël, Hannibal, Laure, Bastien, G., Moulin, Lionel, Nouwen, Nico, Prin, Yves, Renier, Adeline, Giraud, Eric |
---|---|
Format: | conference_item biblioteca |
Language: | eng |
Published: |
s.n.
|
Subjects: | F62 - Physiologie végétale - Croissance et développement, Aeschynomene, Bradyrhizobium, http://aims.fao.org/aos/agrovoc/c_159, http://aims.fao.org/aos/agrovoc/c_27138, |
Online Access: | http://agritrop.cirad.fr/547525/ http://agritrop.cirad.fr/547525/1/document_547525.pdf |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Characterization of the plant molecular mechanisms governing the Nod-independent symbiosis between Aeschynomene and photosynthetic Bradyrhizobium
by: Bonaldi, Katia, et al. -
Nodulation of Aeschynomene afraspera and A. indica by photosynthetic Bradyrhizobium Sp. Strain ORS285 : The nod-dependent versus the nod-independent symbiotic interaction
by: Bonaldi, Katia, et al. -
Large-scale transposon mutagenesis of photosynthetic Bradyrhizobium sp. strain ORS278 reveals new genetic loci putatively important for nod-independent symbiosis with Aeschynomene indica
by: Bonaldi, Katia, et al. -
The mosaic genomes of two phtosynthetic Bradyrhizobium strains do not contain canonical nodulation genes
by: Giraud, Eric, et al. -
Specific hopanoid classes differentially affect free-living and symbiotic states of Bradyrhizobium diazoefficiens
by: Kulkarni, Gargi, et al.