Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of Arabidopsis exposed to low red:far red light treatment at 16 and 22 degrees

ABSTRACT: The purpose of this experiment was to identify genes responding differently to a 24 h low red to far red ratio (R:FR) treatment in plants grown at 16 and 22 degrees Experiment Overall Design: Microarrays were used as a gene discovery tool to identify genes showing differential regulation by low R:FR at 2 growth temperatures. Plants subject to a 24 h low R:FR light treatment were compared with control plants maintained in high R:FR. This experiment was carried out at two growth temperatures, 16oC and 22oC.

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Keara Franklin

PROVIDER: E-GEOD-8745 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Light-quality regulation of freezing tolerance in Arabidopsis thaliana.

Franklin Keara A KA Whitelam Garry C GC

Nature genetics 20071028 11

To acquire freezing tolerance, higher plants require a period of low temperature (usually <4 degrees C) termed cold acclimation. Upon transfer of plants to low temperature, increased expression of the CRT/DRE binding factor (CBF) family of transcriptional activators leads to the upregulation of genes containing a C-repeat/drought-responsive (CRT/DRE) promoter element and metabolic changes that enhance tolerance to subzero temperatures. Here, we show that a low red to far-red ratio (R/FR) light s ...[more]

PMID: 17965713

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Project description:In dense plant stands, the ratio between red and far-red (R:FR) light declines and shade intolerant species will respond to this cue for future shade by inducing the shade avoidance syndrome (SAS), enabling them to outgrow their neighbours. Shade tolerant species from the forest understory are unable to outgrow neighbouring trees and will suppress SAS. Although the molecular mechanisms underlying SAS are well studied in various species, mechanisms of SAS-suppression in shade tolerant species have rarely been studied. We applied RNA sequencing on Geranium pyrenaicum and G. robertianum, two wild species with contrasting growth responses to low R:FR light. G. pyrenaicum strongly induces petiole elongation when exposed to low R:FR light, at any time of the photoperiod. Contrastingly, G. robertianum only induces this response early in the day, and suppresses petiole growth in low R:FR light at the end of the photoperiod, which results after 24 hours in a net difference with control treatments of zero. We compared expression patterns in the most apical (most responsive) part of the second petioles, in two-week-old Geranium plants (two leaf stage) after 2 and 11.5 hours of far-red light enrichment. This way, we identified a number of novel candidate regulators of shade avoidance, and differential phytochrome control of plant immunity genes in the two species. For de-novo assembly of the reference transcriptomes, we pooled petiole- and leaf lamina tissue exposed to normal white light (180 mol m-2 s-1 PAR, R:FR 1.8, Â± 60 mol m-2 s-1 blue light), low R:FR light (0.2), blue-depleted light (Â± 4 mol m-2 s-1 blue) and green shade (50 mol m-2 s-1 PAR, R:FR 0.45, Â± 13 mol m-2 s-1 blue) for 2, 11.5 and 24 hours. Libraries of these samples were normalized, Illumina sequenced, and together with sequences of non-normalized petiole samples of the expression analysis constructed into a reference transcriptome for each species, using the Trinity protocol. Transcripts were clustered into orthologue clusters using the ortho-MCL clustering technique. Non-normalized libraries of samples (control vs. low R:FR light, 2 and 11.5 hours after start of the treatment) were sequenced and aligned to the newly assembled transcriptomes. Read counts were summed per orthologue cluster before statistical analysis was proceeded.

Dataset Information

Transcription profiling of Arabidopsis exposed to low red:far red light treatment at 16 and 22 degrees

Publications

Light-quality regulation of freezing tolerance in Arabidopsis thaliana.

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