Transcriptome Profiles of Nod Factor-independent Symbiosis in the Tropical Legume Aeschynomene evenia

Scientific Reports
Djamel GullyFabienne Cartieaux

Abstract

Nod factors (NF) were assumed to be indispensable for the establishment of a rhizobium-legume symbiosis until the discovery that certain Bradyrhizobium strains interacting with certain Aeschynomene species lack the canonical nodABC genes required for their synthesis. So far, the molecular dialogue between Aeschynomene and its symbionts remains an open question. Here we report a time course transcriptional analysis of Aeschynomene evenia in response to inoculation with Bradyrhizobium ORS278. The NF-independent symbiotic process was monitored at five time points between bacterial infection and nodule maturity. The five time points correspond to three specific events, root infection by crack entry, nodule organogenesis, and the establishment of the nitrogen fixing process. During the third stage, about 80 NCR-like genes and eight symbiotic genes known to be involved in signaling, bacterial infection or nodulation regulation were highly expressed. Comparative gene expression analyses at the five time points also enabled the selection of genes with an expression profile that makes them promising markers to monitor early plant responses to bacteria. Such markers could be used in bioassays to identify the nature of the bacterial signa...Continue Reading

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Citations

Oct 15, 2019·Cellular Microbiology·Claire BenezechBenjamin Gourion
Dec 21, 2019·Journal of Applied Microbiology·P NagS Das
Feb 7, 2021·Nature Communications·Johan QuilbéJean-François Arrighi
Feb 25, 2021·Journal of Experimental Botany·Johan Quilbé, Jean-François Arrighi

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Datasets Mentioned

BETA
PRJNA396532
PRJNA399681
SRR5983075

Methods Mentioned

BETA
RNAseq
Confocal microscopy
454 sequencing
RNA-seq
transgenic
Illumina sequencing
PCR

Software Mentioned

coverageBed
- DESeq
MEV
BLAST
TGICL
R script
DESeq
BEDtools
TAMARA
Bioconductor

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