Dataset Information


Transcription profiling by array of Arabidopsis phloem

ABSTRACT: This sudy focuses on the identification of transcripts in the shoot phloem of the model plant Arabidopsis thaliana. Transcripts expressed in the phloem tissue (parenchyma cell, companion cell, sieve element) were excised by laser microdissection pressure catapulting (LMPC). These were compared with transcripts isolated from leaf phloem exudates by EDTA-chelation technique. Optimization of sample harvest resulted in RNA of high quality from both sources. Modifications of the RNA amplification procedure obtained RNA of sufficient yield and quality for microarray experiments. Microarrays (Affymetrix, ATH1) hybridized with RNA derived from phloem tissue by LMPC or phloem sap allowed us to differentiate between phloem located and mobile transcript species. The datasets provide a search criterion for phloem-based signals and will facilitate reverse genetic studies and forward genetic screens for phloem and long distance RNA signaling mutants. Experiment Overall Design: Arabidopsis plants were cultivated under short day conditions (8 h light) until flowering. Phloem tissue was isolated by Lasermicrodissection and Pressure Catapulting (LMPC) and phloem exudate by EDTA-chelation technique. In both experiments poly-A-RNA was extracted and amplified before hybridization of microarrays (Affymetrix, ATH1). For both experiments three LMPC-derived phloem tissue (LMPC-derived phloem_1-3) and three phloem exudate samples (Phloem exudate_1-3) were analysed. Precise protocols of plant growth, sample harvest, RNA extraction and amplification are provided in Deeken et al., 2008.

INSTRUMENT(S): 418 [Affymetrix]

ORGANISM(S): Arabidopsis thaliana  

SUBMITTER: Rosalia Deeken  

PROVIDER: E-GEOD-10247 | ArrayExpress | 2008-10-25



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Identification of Arabidopsis thaliana phloem RNAs provides a search criterion for phloem-based transcripts hidden in complex datasets of microarray experiments.

Deeken Rosalia R   Ache Peter P   Kajahn Inga I   Klinkenberg Joern J   Bringmann Gerhard G   Hedrich Rainer R  

The Plant journal : for cell and molecular biology 20080514 5

SUMMARY: Phloem-mobile signals play a major role in plant nutrition, development and communication. In the latter context, phloem-mobile RNAs have been associated with signalling between plant tissues. In this study, we focused on the identification of transcripts in the shoot phloem of the model plant Arabidopsis thaliana. To isolate transcripts expressed in phloem parenchyma cells and in companion cell-sieve element complexes, we used laser microdissection coupled to laser pressure catapulting  ...[more]

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