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The poplar root transcriptome: analysis of 7000 expressed sequence tags
Annegret Kohler1, Christine Delaruelle, David Martin
1UMR INRA/Université Henri Poincaré 1136, Interactions Arbres/Microorganismes, INRA-Nancy, 54280 Champenoux, France.
FEBS Letters
|May 6, 2003
Summary
This study details expressed sequence tags (ESTs) from hybrid cottonwood roots, revealing unique transcripts involved in metabolism, signaling, and transport. These findings aid in understanding root function and developing molecular tools for poplar research.
Area of Science:
- Plant Molecular Biology
- Forest Genetics
- Transcriptomics
Background:
- Most poplar expressed sequence tags (ESTs) originate from above-ground tissues.
- Limited genomic data exists for poplar root systems, hindering functional analysis.
Purpose of the Study:
- To generate a comprehensive set of ESTs from hybrid cottonwood (Populus trichocarpaxdeltoides) roots.
- To identify root-specific transcripts and analyze their putative functions.
- To create a Unigene set for developing microarrays to study root development.
Main Methods:
- cDNA library construction from both normal and water-stressed poplar roots.
- Expressed Sequence Tag (EST) sequencing and assembly.
- Bioinformatic analysis to assign putative functions and identify transcript categories.
- Development of nylon microarrays using the Unigene set.
Main Results:
- Generated 7013 ESTs from hybrid cottonwood roots, assembling into 4874 unique transcripts.
- Assigned putative functions to 62% of transcripts, with significant representation in metabolism (5% energy, 8% metabolism).
- Identified root-specific transcripts involved in signaling (6%) and transport (4%), including aquaporins.
Conclusions:
- This study provides a valuable resource of poplar root ESTs, expanding transcriptomic knowledge for this species.
- The identified root-specific transcripts offer insights into essential root functions like nutrient uptake and stress response.
- The developed microarrays enable further investigation into gene expression during adventitious root development.