Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of light and carbon signaling interactions in Arabidopsis

ABSTRACT: A. thaliana seeds of Columbia (Col-0) ecotype were surface-sterilized, plated on designated media and vernalized for 48 hours at 8C. Plants were grown semi-hydroponically under 16-hr-light, 8-hr-dark cycles at a constant temperature of 23C on basal Murashige and Skoog medium supplemented with 2 mM KNO3, 2 mM NH4NO3 and 30 mM sucrose. Two-week-old seedlings were transferred to fresh MS media without nitrogen and sucrose and dark-adapted for 48 hours. To perform specific metabolic treatments manipulating availability of source of carbon (C) and illumination (L): -C-L, +C-L, -C+L, +C+L, two-week-old seedlings were transferred to fresh MS medium containing 0% or 1% sucrose and either placed back into the dark or illuminated with white light for an additional 8 hours. The various treatments were compared to one another using the treatment of -C-L as the background treatment to which all other treatments (-C+L, +C-L, +C+L) were compared.

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Michael Shin

PROVIDER: E-MEXP-71 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Genome-wide investigation of light and carbon signaling interactions in Arabidopsis.

Thum Karen E KE Shin Michael J MJ Palenchar Peter M PM Kouranov Andrei A Coruzzi Gloria M GM

Genome biology 20040127 2

<h4>Background</h4>Light and carbon are two essential signals influencing plant growth and development. Little is known about how carbon and light signaling pathways intersect or influence one another to affect gene expression.<h4>Results</h4>Microarrays are used to investigate carbon and light signaling interactions at a genome-wide level in Arabidopsis thaliana. A classification system, 'InterAct Class', is used to classify genes on the basis of their expression profiles. InterAct classes and ...[more]

PMID: 14759260

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Project description:A critical step in regeneration is recreating the cellular identities and patterns of lost organs long after embryogenesis is complete. In plants, perpetual (indeterminate) organ growth occurs in apical stem cell niches, which have been shown to re-establish quickly when damaged or removed (1,2). Here we ask whether the machinery of perpetual organ growth, stem cell activity, is needed for the phase of regeneration that leads to replenishing lost cell identities and patterning, or, whether organ re-establishment enlists a wider group of pluripotent cells. We adapt a root tip regeneration system to Arabidopsis that permits us to assess the molecular and functional recovery of specific cell fates during organ regeneration. These results suggest a rapid restoration of missing cell fate and function in advance of the recovery of stem cell activity. Surprisingly, plants with mutations that fail to maintain stem cell activity were able to re-pattern their distal tip and re-specify lost cell fates. Thus, although stem cell activity is required to resume indeterminate growth (3), our results show it is not necessary for cell re-specification and patterning steps. This implies a regeneration mechanism that coordinates patterning of the whole organ, as in embryogenesis, but is initiated from different starting morphologies. 1. Feldman, L. J. Denovo Origin of Quiescent Center Regenerating Root Apices of Zea-Mays. Planta 128, 207-212 (1976). 2. Xu, J. et al. A molecular framework for plant regeneration. Science 311, 385-8 (2006). 3. Gordon, S. P. et al. Pattern formation during de novo assembly of the Arabidopsis shoot meristem. Development 134, 3539-48 (2007). We adapted root tip excision techniques to Arabidopsis, enabling us to perform microarray profiling of regenerating root tissue. Excisions were performed at 4 days post-germination (dpg) at a distance of 130 um from the root tip, resulting in the complete excision of QC, all surrounding stem cells along with several tiers of daughter cells, and the root cap, including all of the columella and most of the lateral root cap. The tip section and then approximately 70 um of regenerating tissue was recut at different time points post cutting. We sampled regenerating stumps at 0hrs, 5 hrs, 13 hrs, 22 hrs, and 7 days after the excision for microarray analysis (Methods). We also sampled root sections immediately above the zone competent to regenerate at 270 um to approximately 340 um. Experiment Overall Design: 30 samples with 4 or 3 replicates for each condition representing a time course of regenerating root stumps and including controls for root tips (regeneration endpoint) at 4 dpg and 8 dpg and a wounded set of samples representing root tissue at 270-340 mm from the root tip for non-regeneration control

Dataset Information

Transcription profiling of light and carbon signaling interactions in Arabidopsis

Publications

Genome-wide investigation of light and carbon signaling interactions in Arabidopsis.

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