Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of Medicago truncatula radicles incubated in polyethylene glycol solution and embryos at different time points after pollination to study dessication tolerance

ABSTRACT: Time course of the transcriptome of desiccation-sensitive 2.7-2.9 mm-long radicles of Medicago truncatula seeds at different time points during incubation in a polyethylene glycol (PEG) solution at -1.7 MPa and 10°C, resulting in a gradual re-establishment of desiccation tolerance. Gene profiling was also performed on embryos before (14 days after pollination) and after acquisition of desiccation tolerance during maturation (20 days after pollination).

INSTRUMENT(S): ScanArray Express HT [PerkinElmer]

ORGANISM(S): Medicago truncatula

SUBMITTER: helge Kuster

PROVIDER: E-MEXP-664 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Transcriptome profiling uncovers metabolic and regulatory processes occurring during the transition from desiccation-sensitive to desiccation-tolerant stages in Medicago truncatula seeds.

Buitink Julia J Leger Jean J JJ Guisle Isabelle I Vu Benoit Ly BL Wuillème Sylvie S Lamirault Guillaume G Le Bars Alice A Le Meur Nolwenn N Becker Anke A Küster Helge H Leprince Olivier O

The Plant journal : for cell and molecular biology 20060901 5

To investigate regulatory processes and protective mechanisms leading to desiccation tolerance (DT) in seeds, 16086-element microarrays were used to monitor changes in the transcriptome of desiccation-sensitive 3-mm-long radicles of Medicago truncatula seeds at different time points during incubation in a polyethylene glycol (PEG) solution at -1.7 MPa, resulting in a gradual re-establishment of DT. Gene profiling was also performed on embryos before and after the acquisition of DT during maturat ...[more]

PMID: 16923015

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Project description:Spingomonas wittichii strain RW1 can completely oxidize dibenzo-p-dioxins and dibenzofurans, which are persistent contaminants of soils and sediments. For successful application in soil bioremediation systems, strain RW1 must cope with fluctuations in water availability, or water potential. The objectives of this study were to characterize how strain RW1 responses to changes in different components of the total water potential (solute and matric potential) and to then connect these responses to more realistic scenarios of soil desiccation. To accomplish this task, transcriptome profiling was used to investigate the effects of decreasing the solute potential with sodium chloride (solute stress), decreasing the matric potential with high-molecular weight polyethylene glycol (matric stress), or inoculating cells directly into unsaturated sand (sand desiccation stress). Transcriptome profiling revealed a general response to solute, matric, and sand desiccation stress that involved synthesizing trehalose and modifying the composition of exopolysaccarides. Transcriptome profiling also revealed responses that were unique to each stress. Only solute and matric stress triggered the down-regulation of flagella genes. Only solute and sand desiccation stress triggered the up-regulation of two RNA polymerase ECF-type sigma factors along with several membrane proteins, mechanosensitive channels, and solute transporters. Finally, only matric stress triggered the up-regulation of the RNA polymerase sigma-32 factor along with several molecular chaperones. Together, this study revealed a general response to solute, matric and sand desiccation stress but also unique responses to only a subset of these stresses, suggesting that each stress affects strain RW1 in a fundamentally different way. Comparative transcriptome profiling was performed to assess the effects of acute (30 min) solute and matric stress (3 samples for acute solute stress, 3 samples for acute matric stress, 3 controls), the effects of chronic (24 hours) solute and matric stress (3 samples for chronic solute stress, 3 samples for chronic matric stress, 3 controls), and the effects of sand desiccation stress (4 samples for sand desiccation treatment, 3 controls).

Dataset Information

Transcription profiling of Medicago truncatula radicles incubated in polyethylene glycol solution and embryos at different time points after pollination to study dessication tolerance

Publications

Transcriptome profiling uncovers metabolic and regulatory processes occurring during the transition from desiccation-sensitive to desiccation-tolerant stages in Medicago truncatula seeds.

Similar Datasets

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