Project description:The cold acclimation process is regulated by many factors like ambient temperature, day length, light intensity, or hormonal status. Experiments with plants grown under different light-quality conditions indicate that the plant response to cold is also a light-quality-dependent process. Here, the role of light quality in the cold response was studied in one-month-old Arabidopsis thaliana (Col‐0) plants exposed for one week to 4 °C at short‐day conditions under white (100 and 20 μmol m‐2s‐1), blue or red (20 μmol m‐2s‐1) light conditions. An upregulated expression of CBF1, an inhibition of photosynthesis, and an increase in membrane damage showed that blue light enhanced the effect of low temperature. Interestingly, cold-treated plants under blue and red light showed only limited freezing tolerance compared to white light cold-treated plants. Next, the specificity of the light quality signal in cold response was evaluated in Arabidopsis accessions originating from different and contrasting latitudes. In all but one Arabidopsis accessions, blue light increased the effect of cold on photosynthetic parameters and electrolyte leakage. This effect was not found for Ws-0, which lacks functional CRY2 protein, indicating its role in the cold response. Proteomics data confirmed significant differences between red and blue light treated plants at low temperature and showed that the cold response is highly accession specific. In general, blue light increased mainly the cold-stress related proteins and red light induced higher expression of chloroplast-related proteins, which correlated with higher photosynthetic parameters in red light cold-treated plants. Altogether, our data suggest that light modulates two distinct mechanisms during the cold treatment - red light driven cell function maintaining program and blue light activated specific cold response. The importance of mutual complementarity of these mechanisms was demonstrated by significantly higher freezing tolerance of cold-treated plants under white light.
Project description:Elongator is a histone acetyltransferase (HAT) complex associated with RNA polymerase II (RNAPII) to facilitate transcription elongation. It consists of subunits Elp1-6, with Elp3 conferring HAT activity. Elongator is conserved in yeast, plants and humans. In humans, mutations in Elp genes cause neuronal diseases. In plants, Elongator is a positive regulator of cell proliferation during leaf and root growth. Consequently, Arabidopsis Elongator mutants (elo) have narrow leaves and short roots; additionally, germination, vegetative growth and reproductive development are also affected. Mutants have altered auxin signaling, and a number of auxin-related genes are among those differentially expressed in the mutant. Only two genes have been confirmed as targeted by Elongator during RNAPII transcription elongation, including the light-regulated auxin response regulator IAA3/SHY2.
Project description:Environmental stimuli-triggered stomatal movement is a key physiological process that regulates CO<sub>2</sub> uptake and water loss in plants. Stomata are defined by pairs of guard cells that perceive and transduce external signals, leading to cellular volume changes and consequent stomatal aperture change. Within the visible light spectrum, red light induces stomatal opening in intact leaves. However, there has been debate regarding the extent to which red-light-induced stomatal opening arises from direct guard cell sensing of red light versus indirect responses as a result of red light influences on mesophyll photosynthesis. Here we identify conditions that result in red-light-stimulated stomatal opening in isolated epidermal peels and enlargement of protoplasts, firmly establishing a direct guard cell response to red light. We then employ metabolomics workflows utilizing gas chromatography mass spectrometry and liquid chromatography mass spectrometry for metabolite profiling and identification of Arabidopsis guard cell metabolic signatures in response to red light in the absence of the mesophyll. We quantified 223 metabolites in Arabidopsis guard cells, with 104 found to be red light responsive. These red-light-modulated metabolites participate in the tricarboxylic acid cycle, carbon balance, phytohormone biosynthesis and redox homeostasis. We next analyzed selected Arabidopsis mutants, and discovered that stomatal opening response to red light is correlated with a decrease in guard cell abscisic acid content and an increase in jasmonic acid content. The red-light-modulated guard cell metabolome reported here provides fundamental information concerning autonomous red light signaling pathways in guard cells.
Project description:Plants experience dynamic light daily, with light conditions varying on a second-by-second basis. Little is understood about the mechanisms that allow plants to survive such variable conditions. Here, we have exposed Arabidopsis thaliana plants to naturally fluctuating light regimes alongside traditional square light regimes. The response was highly consistent across experiments, leading us to believe there is an epigenetic mechanism involved. We show significant alterations in DNA methylation between fluctuating light acclimated plants, and square light acclimated plants, demonstrating the frequency of fluctuations impacts the plant methylation. This was accompanied by significant changes in gene expression, some of which correlated with altered DNA methylation. Interestingly, several transposable elements which displayed differential methylation were found to be differentially expressed between light regimes. This data suggests DNA methylation may have a role in acclimation to natural light which may directly regulate gene expression and impact transposable element activation.
Project description:To understand the transcript regulation of early Arabidopsis seedlings developments with different chemicals under continuous blue light irradiation.
Project description:The aim of this study was to perform a transcriptional characterization of the Arabidopsis eds4 mutant. To this end two separate experiments were performed: Experiment 1: comparison of the transcriptional profile (RNA-seq) of eds4 Arabidopsis mutants in contrast to wild type Col-0 accession grown under continuous light conditions. Experiment 2: Analysis of the distribution of transcripts (RNA-seq) between nucleus and cytoplasm in the eds4 Arabidopsis mutants in comparison to wild type Col-0 plants grown under continuous light conditions.
Project description:Louis Pasteur first reported that living cells switch from aerobic to anaerobic metabolism under low-oxygen conditions. We searched for Arabidopsis thaliana mutants with downregulated expression of hypoxia-induced ALCOHOL DEHYDROGENASE 1 (ADH1), encoding a key enzyme in ethanolic fermentation. This screen identified mutants in IQ DOMAIN containing protein 22 (IQD22). The iqd22 mutants were hypersensitive to submergence and hypoxic stress, whereas IQD22 overexpressors were more tolerant of both compared to wild type. Moreover, under hypoxia, IQD22 interacted with calmodulins (CaMs) in vivo and facilitated their association with ADH1, stimulating its activity. Metabolic profiling revealed that hypoxia caused significant increases of glycolytic metabolites, but significantly lower ethanol in iqd22-2 mutant compared to the wild type. Furthermore, deleting ADH1 suppressed the improved hypoxia-tolerance phenotype of IQD22 overexpressors. Our findings thus shed light on the IQD22–CaM–ADH1 regulatory module that mediates calcium-dependent activation of anaerobic respiration to control metabolic flux during hypoxia.
Project description:Plants experience dynamic light daily, with light conditions varying on a second-by-second basis. Little is understood about the mechanisms that allow plants to survive such variable conditions. Here, we have exposed Arabidopsis thaliana plants to naturally fluctuating light regimes alongside traditional square light regimes. The response was highly consistent across experiments, leading us to believe there is an epigenetic mechanism involved. We show significant alterations in DNA methylation between fluctuating light acclimated plants, and square light acclimated plants, demonstrating the frequency of fluctuations impacts the plant methylation. This was accompanied by significant changes in gene expression, some of which correlated with altered DNA methylation. Interestingly, several transposable elements which displayed differential methylation were found to be differentially expressed between light regimes. This data suggests DNA methylation may have a role in acclimation to natural light which may directly regulate gene expression and impact transposable element activation.
Project description:Sun-loving plants have the ability to detect and avoid shading through sensing of both blue and red light wavelengths. Higher plant cryptochromes (CRYs) control how plants modulate growth in response to changes in blue light. For growth under a canopy, where blue light is diminished, CRY1 and CRY2 perceive this change and respond by directly contacting two bHLH transcription factors, PIF4 and PIF5. These factors are also known to be controlled by phytochromes, the red/far-red photoreceptors; however, transcriptome analyses indicate that the gene regulatory programs induced by the different light wavelengths are distinct. Our results indicate that CRYs signal by modulating PIF activity genome-wide, and that these factors integrate binding of different plant photoreceptors to facilitate growth changes under different light conditions. We performed whole-genome transcriptome (mRNA-seq) analysis on 5-day-old Arabidopsis thaliana Columbia wild-type (WT) and pif4pif5 seedlings exposed to low blue-light (LBL) or mock-treated for 1, 6 and 24 hours. In addition we performed mRNA-seq on WT, 35S::PIF4-9xMyc-6x-His-3xFlag(Flash) and 35S::PIF5-9xMyc-6x-His-3xFlag (Flash) seedlings treated with LBL or mock-treated for 16 hours.