Chemical-induced inhibition of blue light-mediated seedling development in Arabidopsis
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PROVIDER: PRJNA349022 | ENA |
REPOSITORIES: ENA
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Project description:A tuberization inhibitor has long been postulated, but not yet found. We found that blue light inhibits tuberization in Norland, a day-neutral variety of Solanum tuberosum L. Tissue-cultured plants formed tubers within 8 weeks under continuous darkness, and white, red, or far-red light. Preliminary experiments indicated that a one- or two-day exposure to blue light after 3-4 weeks of dark treatment will inhibit tuber formation in ‘Norland’ plants. Using this system and expression profiling, we may be able to identify candidate tuberization inhibitors. 'Norland' plants (subcultured from existing cultures and grown for two weeks under continuous 100 umol/m2-s white fluorescent light) were placed in tuber-inducing media containing 6% sucrose, vitamins, MS salts, and kinetin (2.5 mg/L). Tubes containing plants were wrapped in two layers of aluminum foil. After 3 weeks and 2 days, half of the tubes were exposed to 6-7 umol/m2-s blue light. The other half of the tubes were left in darkness (controls). After 2 days, all plants were harvested and frozen in liquid nitrogen. Plants exposed to blue light were harvested under blue light. Control plants were harvested under < 2 umol/m2-s light conditions. All plant transfers were done at 1700 (5 PM) to avoid possible complications due to circadian effects. Experiments were performed four times, from subculture to harvest. RNA was extracted from stem and leaf tissue of plants using the Qiagen RNeasy Plant Mini kit. Extracted RNA was then converted to dsDNA using the Invitrogen protocol and reagents for double stranded cDNA synthesis. The resulting dsDNA was in vitro transcribed into amplified RNA using the Ambion procedure and reagents for in vitro transcription. cDNA was purified using Qiagen MinElute columns and protocol. Amplified RNA was purified using Ambion columns or Qiagen RNeasy columns and the Ambion protocol, and quantified using RiboGreen dye fluorometry. Keywords: Direct comparison
2008-02-13 | GSE10491 | GEO
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2017-02-28 | GSE88864 | GEO
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2017-02-28 | GSE88889 | GEO
Project description:Purpose: The goal of this study was to characterize the transcript levels of genes in Drosophila photoreceptor neurons in response to blue light. Using transcriptome profiling of isolated photoreceptor nuclei, we analyzed the changes in gene expression that occur in response to 3h of blue light exposure at 1 or 6 days post-eclosion. We identified sets of genes with both up-regulated and down-regulated expression in response to blue light at either age.
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Project description:Cryptochromes are blue-light receptors in plants and animals. Homodimers are the physiologically active form of plant cryptochromes that mediates blue light regulation of gene expression and photomorphogenesis, but how light regulates the photoreceptor activation and inactivation remains unclear. We identified an Arabidopsis protein BIC1 (Blue-light Inhibitor of Cryptochromes 1) that inhibits all photoreactions of plant cryptochrome 2 (CRY2) examined, allowing direct tests of the photoactivation and inactivation mechanisms of CRY2. We found that blue light stimulates homodimerization of CRY2, whereas BIC1 binds to CRY2 to suppress CRY2 dimerization and the interaction of CRY2 with its signaling partners. We further show that cryptochromes and phytochromes mediate light induction of BIC1 transcription, evoking the negative feedback circuitry to control homeostasis of the active cryptochromes under the broad spectra of solar radiation in nature.
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Project description:Blue light regulates phosphate deficiency-dependent primary root growth inhibition in Arabidopsis
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Project description:We identified 737 differentially expressed genes, including 430 upregulated genes and 307 downregulated genes, by calculating the gene FPKM in each sample and conducting differential gene analysis. Gene ontology analysis and KEGG pathway enrichment analysis suggested that blue light influenced visual perception, sensory perception of light stimulus, phototransduction, and JAK-STAT signaling pathways. Differential lncRNA, circRNA and miRNA analysis suggested that blue light exposure affected pathways for retinal cone cell development and phototransduction, among others.
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