Plant metagenome
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA613184 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR11348663_1.fastq.gz | Fastqsanger.gz | |||
| SRR11348663_2.fastq.gz | Fastqsanger.gz | |||
| SRR11348664_1.fastq.gz | Fastqsanger.gz | |||
| SRR11348664_2.fastq.gz | Fastqsanger.gz | |||
| SRR11348665_1.fastq.gz | Fastqsanger.gz |
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Project description:<p>Drought stress negatively impacts microbial activity, but the magnitude of stress responses are likely dependent on a diversity of below ground interactions. Populus trichocarpa individuals and no plant bulk soils were exposed to extended drought (~0.03% gravimetric water content (GWC) after 12d), re-wet, and a 12-d 'recovery' period to determine the effects of plant presence in mediating soil microbiome stability to water stress. Plant metabolomic analyses indicated that drought exposure increased host investment in C and N metabolic pathways (amino acids, fatty-acids, phenolic glycosides) regardless of recovery. Several metabolites positively correlated with root-associated microbial alpha diversity, but not those of soil communities. Soil bacterial community composition shifted with P. trichocarpa presence and with drought relative to irrigated controls, whereas soil fungal composition only shifted with plant presence. However, root fungal communities strongly shifted with drought, whereas root bacterial communities changed to a lesser degree. The proportion of bacterial water-stress opportunistic OTUs (enriched counts in drought) were high (~11%) at the end of drying phases, and maintained after re-wet, and recovery phases in bulk soils, but declined over time in soils with plants present. For root fungi opportunistic OTUs were high at the end of recovery in drought treatments (~17% abundance), although relatively not responsive in soils, particularly planted soils (< 0.5% abundance for sensitive or opportunistic). These data indicate that plants modulate soil and root associated microbial drought responses via tight plant-microbe linkages during extreme drought scenarios, but trajectories after extreme drought vary with plant habitat and microbial functional groups.</p>
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Project description:Purpose: The recent publication of the fungal mutualist R. irregularis genome facilitated transcriptomic studies. We here adress the gene regulation of R. irregularis in response to plant signals in the switch from asymbiotic to presymbiotic growth Methods: Spores of R. irregularis were treated with GR24 (strigolactone synthetic analog) and collected at 1 hour, 2 days, 7 days and 14 days after induction. To stimulate the fungus with root exudates, a cellophane membrane allowing molecule exchanges was deposited on in vitro Daucus carotta roots. Spores were spotted on this membrane and collected 14 days after. To monitor fungal gene regulation, control conditions were also prepared and mRNA were sequenced by HiSeq Illumina. Read were mapped on the genome assembly with CLCworkbench Results: At 1 hour, GR24 triggered the overexpression (fold change >2; FDR<0,05) of 123 genes and the repression (fold change < -2; FDR<0,05) of 17 genes. At 2 days, 33 genes were induced, 13 repressed ; at 7 days 106 genes were induced and 13 repressed and at 14 days 19 genes were induced and 10 repressed. Few genes overlap between the different time point. Root exudates induced 251 genes and repressed 63 genes. Few genes were regulated by both GR24 and root exudates. Conclusions: GR24 kinetic showed that fungal gene regulation is sequential, quick and involves hundreds of genes. Among those genes, a chitin synthase, involved either in fungal growth either in symbiotic signal production was strongly induced at 1hour, 7 days and 14 days. As few genes are regulated in response to root exudates and GR24, we propose that other plant signals play a role in ealy steps and trigger fungal gene regulation. Several genes coding for putative secreted peptides were induced in response to these plant signals. These genes might be effectors involved in early plant defense manipulation, then facilitating root entry. Thus, they are good candidates to investigate early steps of plant penetration.
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