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PHYB and PHYC–mediated transcriptomic responses to short and long day photoperiods in wheat

ABSTRACT: The phytochromes (PHYs) are a family of photoreceptors which absorb red and far-red light to modulate developmental responses in photosynthetic organisms. We developed knockout mutants of PHYB and PHYC in tetraploid wheat and performed RNA-seq studies to analyze and compare the regulons of each phytochrome under short day photoperiods.

ORGANISM(S): Triticum turgidum subsp. durum

PROVIDER: GSE141000 | GEO | 2019/11/26

REPOSITORIES: GEO

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RNA-seq studies using wheat PHYTOCHROME B and PHYTOCHROME C mutants reveal shared and specific functions in the regulation of flowering and shade-avoidance pathways

2016-06-29 | GSE79049 | GEO

RNA-seq studies using wheat PHYTOCHROME B and PHYTOCHROME C mutants reveal shared and specific functions in the regulation of flowering and shade-avoidance pathways

Project description:The phytochromes (PHYs) are a family of photoreceptors which absorb light of red and far-red wavelengths to modulate developmental responses in photosynthetic organisms. We developed knockout mutants of PHYB and PHYC in wheat and performed replicated RNA-seq studies to analyze and compare the regulons of each phytochrome under long day photoperiods. Illumina Truseq v2 RNA-seq libraries were constructed from four biological replicates of phyBnull mutants and their wild-type sister lines and of phyCnull mutants and their wild-type sister lines. Subsequently, the entire experiment was replicated. Reads were mapped to the draft assembly (v2.2) of the wheat genome provided by the International Wheat Genome Sequencing Consortium (IWGSC) and transcribed regions were identifed by mapping a non-redundant set of transcripts to this genomic assembly. Sequencing reads mapping uniquely within these identified transcribed regions were used to determine relative expression profiles. Loci which were differentially expressed in both experimental replicates were designated high-confidence PHYB-regulated and PHYC-regulated genes, respectively. A GTF file is provided detailing the location of the 150,754 loci within the IWGSC pseduomolecules and contig scaffold followed by the longest transcribed sequence mapping to this region. Most, but not all, transcribed sequences are annotated through Ensembl.

2016-06-29 | E-GEOD-79049 | biostudies-arrayexpress

Phytochrome C And Low Temperature Promote The Expression And Red Light Signaling Of Phytochrome D

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.

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Phytochrome C and Low Temperature Promote the Expression and Red Light Signaling of Phytochrome D

2024-01-19 | GSE253236 | GEO

Analyses of phyB-regulated genes by RNA-seq

Project description:The phytochrome family consists of five numbers (phyA-phyE) in Arabidopsis, of which phyB is the best characterized and shown to play a major role in mediating red light inhibition of hypocotyl elongation. In order to reveal the molecular basis for phyB-mediated red light signaling to promote photomorphogenesis, we analyzed the gene expression profile of red light-grown WT and phyB mutant seedlings by high throughput sequencing.

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Transcription profiling of Arabidopsis phyA and phyB mutants, and wild type plants, grown in the dark

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. , ,

2007-06-27 | E-GEOD-3038 | biostudies-arrayexpress

Expression data from epidermis specific phytochrome B or global phytochrome B line comparing to phyB-9 mutant.

Project description:Seedling hypocotyls display negative gravitropism in the dark but agravitropism in the light. The Arabidopsis thaliana pif quadruple mutant (pifQ), which lacks four PHYTOCHROME-INTERACTING FACTORS (PIFs), is agravitropic in the dark. Endodermis-specific expression of PIF1 rescues gravitropism in pifQ mutant seedlings. Since phytochromes induce light responses by inhibiting PIFs and the COP1-SPA ubiquitin E3 ligase complex in the nucleus, we asked whether phyB can cell autonomously inhibit hypocotyl negative gravitropism in the endodermis. We found that while epidermis-specific expression of PHYB rescues hypocotyl negative gravitropism and all other phyB mutant phenotypes, endodermis-specific expression of PHYB does not. Epidermal phyB induces the phosphorylation and degradation of endodermal PIFs in response to red light. This induces a global gene expression pattern similar to that induced by red light treatment of seedlings expressing PHYB under the control of its own endogenous promoter. Our results imply that epidermal phyB generates an unidentified mobile signal that travels to the endodermis where it promotes PIF degradation and inhibits hypocotyl negative gravitropism.

2017-02-08 | GSE87591 | GEO

PHYB and PHYC–mediated transcriptomic responses to short and long day photoperiods in wheat

Project description:PHYB and PHYC–mediated transcriptomic responses to short and long day photoperiods in wheat

| PRJNA591632 | ENA

Expression data of Arabidopsis thaliana (Ler accession) phytochrome phyABCDE quintuple mutant and phyABDE quadruple mutant in response to red light, and their comparison to WT expression data

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.

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RNA-seq Transcriptome Profiling of Tiller Buds in the First Leaf Axil of Phytochrome B mutant (phyB-1) and Wild-type Sorghum from Initiation to Dormancy (phyB-1) and Outgrowth (wild-type)

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2017-03-30 | GSE79389 | GEO

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