Expression profiles of dark or red-light treated WT and phytochrome mutants
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ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
PROVIDER: GSE118824 | GEO | 2019/08/21
REPOSITORIES: GEO
Similar Datasets
Project description:Light is an ever-changing environmental parameter affecting almost every aspects of plant growth and development. It is perceived by photoreceptors, among them phytochromes (PHY) are responsible for monitoring the red and far-red part of the spectrum. Arabidopsis thaliana possesses five phytochromes genes, named through phyA-phyE. Whereas the function of phyA and phyB – that mediate most of the phytochrome responses – is extensively studied, our knowledge on other phytochromes are still rudimentary. To analyze phyD function we expressed it at high levels in different phytochrome deficient genetic backgrounds. We found that overexpressed phyD governs effective light signaling at low temperatures but only in cooperation with functional phyC. Under these conditions, opposite to phyB, phyD accumulates to high levels and this pool is stable under light illumination. Furthermore, the detectable photoconvertible phyD amount is proportional with the available protein amount indicating that the phyD pool contains fully functional photoreceptors. The thermal reversion of phyD is very fast suggesting that the thermosensing of phyD is based on its protein amount and not on its Pfr conformer stability, which was described for phyB. We also found that phyD and phyB associate to identical genomic locations and mediate similar gene expression changes, however the efficiency of phyD is lower. Taken together our data suggest that under certain conditions synergistic interaction of phyD and phyC substitutes phyB function thus increases the ability of plants to respond more flexible to environmental changes.
2024-01-19 | GSE253236 | GEO
Project description:Light is an ever-changing environmental parameter affecting almost every aspects of plant growth and development. It is perceived by photoreceptors, among them phytochromes (PHY) are responsible for monitoring the red and far-red part of the spectrum. Arabidopsis thaliana possesses five phytochromes genes, named through phyA-phyE. Whereas the function of phyA and phyB – that mediate most of the phytochrome responses – is extensively studied, our knowledge on other phytochromes are still rudimentary. To analyze phyD function we expressed it at high levels in different phytochrome deficient genetic backgrounds. We found that overexpressed phyD governs effective light signaling at low temperatures but only in cooperation with functional phyC. Under these conditions, opposite to phyB, phyD accumulates to high levels and this pool is stable under light illumination. Furthermore, the detectable photoconvertible phyD amount is proportional with the available protein amount indicating that the phyD pool contains fully functional photoreceptors. The thermal reversion of phyD is very fast suggesting that the thermosensing of phyD is based on its protein amount and not on its Pfr conformer stability, which was described for phyB. We also found that phyD and phyB associate to identical genomic locations and mediate similar gene expression changes, however the efficiency of phyD is lower. Taken together our data suggest that under certain conditions synergistic interaction of phyD and phyC substitutes phyB function thus increases the ability of plants to respond more flexible to environmental changes.
2024-01-19 | GSE253043 | GEO
Project description:Analysis of etiolated seedlings exposed for 1hr to red light. Phytochromes are red/far-red light receptors, palying important roles in photomorphogenesis. Results suggest that red light and phytochromes regulate a set of genes' expression in seedlings.
2021-03-01 | GSE111380 | GEO
Project description:The mRNA expression profiles of the quadruple spa mutant spaQ and cop1-4 were analyzed in 1 hour red light treated condition. Under same condition, the gene expression changes in phyB-SPA1 interaction domain mutant was analyzed and compared with wild type.
2018-07-14 | GSE117114 | GEO
Project description:The red/far-red light photoreceptor phytochrome mediates photomorphological responses in plants. For light sensing and signaling, phytochromes need to associate with open-chain tetrapyrrole molecules as the chromophore. Biosynthesis of tetrapyrrole chromophores requires members of ferredoxin-dependent bilin reductases (FDBRs). There are two FDBRs in Physcomitrella patens, HY2 and PUBS. Knocking out both generates the phytochrome-deficient mutant. Datasets here provides the transcriptome profiling of Physcomitrella protonema grown in the dark and exposed to one hour red light. Wild type and the hy2 pubs double mutant were used to dissect the regulated genes of moss phytochromes. For details, please see PMID: .
2012-05-08 | GSE36274 | GEO
Project description:The red/far-red light photoreceptor phytochrome mediates photomorphological responses in plants. For light sensing and signaling, phytochromes need to associate with open-chain tetrapyrrole molecules as the chromophore. Biosynthesis of tetrapyrrole chromophores requires members of ferredoxin-dependent bilin reductases (FDBRs). There are two FDBRs in Physcomitrella patens, HY2 and PUBS. Knocking out both generates the phytochrome-deficient mutant. Datasets here provides the transcriptome profiling of Physcomitrella protonema grown in the dark and exposed to one hour red light. Wild type and the hy2 pubs double mutant were used to dissect the regulated genes of moss phytochromes. 4 samples, dark-grown wild-type and pubs hy2 protonema as time 0 control, followed by red light irradiation for one hour respectively
2012-05-08 | E-GEOD-36274 | biostudies-arrayexpress
Project description:Phytochromes mediate a profound developmental shift when dark-grown seedlings are exposed to light. Here we show that a subset of genes is up regulated in phytochrome B (phyB) mutants even before dark-grown seedlings are exposed to light. Most of these genes bear the RY cis motif, which is a binding site of the transcription factor ABSCISIC ACID INSENSITIVE 3 (ABI3), and the phyB mutation also enhanced ABI3 expression. These changes in transcriptome have physiological consequences as seedlings of the abi3 mutant showed enhanced responses to pulses of far-red light, while ABI3 overexpressers exhibited the opposite pattern. Seedlings of the wild type derived from seeds germinated in full darkness showed enhanced expression of genes bearing the RY cis motif and reduced responses to far-red light. We propose that, via changes in ABI3 expression, light, perceived mainly by phyB in the seed, generates a downstream trans-developmental phase signal that pre-conditions the seedling to its most likely environment. Experiment Overall Design: We analysed the transcriptome profile in dark grown seedlings of the WT, and phyA phyB photoreceptor mutants. All seedlings have the same treatment (3d grown in complete darkness). We have two samples for each genotype that represent two replicates in each case.
2008-06-12 | E-GEOD-3002 | biostudies-arrayexpress
Project description:Phytochromes mediate a profound developmental shift when dark-grown seedlings are exposed to light. Here we show that a subset of genes is up regulated in phytochrome B (phyB) mutants even before dark-grown seedlings are exposed to light. Most of these genes bear the RY cis motif, which is a binding site of the transcription factor ABSCISIC ACID INSENSITIVE 3 (ABI3), and the phyB mutation also enhanced ABI3 expression. These changes in transcriptome have physiological consequences as seedlings of the abi3 mutant showed enhanced responses to pulses of far-red light, while ABI3 overexpressers exhibited the opposite pattern. Seedlings of the wild type derived from seeds germinated in full darkness showed enhanced expression of genes bearing the RY cis motif and reduced responses to far-red light. We propose that, via changes in ABI3 expression, light, perceived mainly by phyB in the seed, generates a downstream trans-developmental phase signal that pre-conditions the seedling to its most likely environment. Keywords: Arabidopsis, photoreceptors, light signal transduction, environmental responses
2005-09-04 | GSE2919 | GEO
Project description:Phytochromes are red/far-red light photoreceptors. We sought to test at the transcriptomic level if Arabidopsis mutants lacking all phytochromes (from phyA to phyE), or just retaining trace levels of phyC, had transcriptional response to red light exposure.
2012-04-01 | GSE31587 | GEO
Project description:Phytochromes mediate a profound developmental shift when dark-grown seedlings are exposed to light. Here we show that a subset of genes is up regulated in phytochrome B (phyB) mutants even before dark-grown seedlings are exposed to light. Most of these genes bear the RY cis motif, which is a binding site of the transcription factor ABSCISIC ACID INSENSITIVE 3 (ABI3), and the phyB mutation also enhanced ABI3 expression. These changes in transcriptome have physiological consequences as seedlings of the abi3 mutant showed enhanced responses to pulses of far-red light, while ABI3 overexpressers exhibited the opposite pattern. Seedlings of the wild type derived from seeds germinated in full darkness showed enhanced expression of genes bearing the RY cis motif and reduced responses to far-red light. We propose that, via changes in ABI3 expression, light, perceived mainly by phyB in the seed, generates a downstream trans-developmental phase signal that pre-conditions the seedling to its most likely environment. Keywords: Arabidopsis, photoreceptors, light signal transduction, environmental responses
2005-09-04 | GSE3038 | GEO