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SRX20275085: GSM7312121: bsi_KO_far-red, rep 2; Pseudomonas syringae pv. syringae B728a; RNA-Seq
1 ILLUMINA (Illumina HiSeq 4000) run: 4.5M spots, 890.4M bases, 302.5Mb downloads

External Id: GSM7312121_r1
Submitted by: Plant Pathology, Entomology, & Microbiology, Iowa State University
Study: Light cues induce transcriptional reprogramming and protective anticipation of environmental water loss in Pseudomonas syringae
show Abstracthide Abstract
The ecological significance of light perception in non-phototrophic bacteria remains largely elusive. In terrestrial environments, diurnal oscillations in light are often temporally coupled to other environmental changes, including increased temperature and evaporation. Here we report that light functions as an anticipatory cue that triggers protective adaptations to tolerate a future rapid loss of environmental water in leaf-associated Pseudomonas syringae pv. syringae (Pss) and other terrestrial pseudomonads. Global transcriptome analyses in Pss showed that light control occurs almost entirely through a bacteriophytochrome photoreceptor that senses red, far-red and blue wavelengths and influences 30% of the Pss genome. Bacteriophytochrome-mediated light control disproportionally upregulates water-stress adaptation functions and confers enhanced fitness when cells encounter light prior to water limitation. These data demonstrate that non-phototrophic bacteria can use light as a cue to mount an adaptive anticipatory response against a physiologically unrelated but ecologically coupled stress. Overall design: Comparative gene expression profiling analysis of RNA-seq data for Pseudomonas syringae pv. syringae strain B278a and isogenic mutants following brief exposure to different light wavelengths
Sample: bsi_KO_far-red, rep 2
SAMN35018109 • SRS17602728 • All experiments • All runs
Library:
Name: GSM7312121
Instrument: Illumina HiSeq 4000
Strategy: RNA-Seq
Source: TRANSCRIPTOMIC
Selection: cDNA
Layout: PAIRED
Construction protocol: Immediately after treatment, 0.5 mL of each culture sample was added to 1 mL of RNAprotect (Qiagen) and vortexed for 5 sec. Following a 5-min incubation at room temperature, the cells from the two independent cultures for a single strain x treatment combination were combined and centrifuged at 5,000 x g for 10 min. The supernatant was decanted, and the cell pellet was stored at -70°C. For each strain, this process was repeated on six separate days. The cell pellets for a given strain x treatment combination collected on two separate days were thawed on ice and combined, and this pool was considered one biological replicate. In this manner, each strain x treatment combination was represented by three biological replicates, each of which contained cells derived from four independently exposed cultures. Total RNA was extracted using a RNeasy Mini Kit (Qiagen) with on-column Dnase I treatment, with one biological replicate for each strain x treatment combination extracted at the same time. Library construction and sequencing were performed by BGI Genomics (China). For each sample, total RNA was depleted for ribosomal RNA using an Epicentre Ribo-Zero Magnetic Kit (Bacteria), fragmented, and then used for RNA-seq library construction using a TruSeq RNA Sample Prep Kit v2 (Illumina). Libraries were assessed for quality using a 2100 Bioanalyzer, quantified using real-time quantitative PCR, and sequenced on an Illumina HiSeq 4000 with 100-bp paired-end reads.
Runs: 1 run, 4.5M spots, 890.4M bases, 302.5Mb
Run# of Spots# of BasesSizePublished
SRR244897414,452,011890.4M302.5Mb2023-09-27

ID:
27696018

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