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Sample GSM398258 Query DataSets for GSM398258
Status Public on May 13, 2009
Title Martin_5d_rep1
Sample type RNA
Source name Flag leaves, harvested at 5 d after drought stress
Organism Hordeum vulgare
Characteristics genotype: Martin
trait for drought tolerance: drought tolerance
tissue: flag leaves
treatment: 5 d after drought stress
Extracted molecule total RNA
Extraction protocol Seven flag leaves of a replication for each genotype were harvested at 5 d after reach 10% of AWC in the soil to constitute a single biological replicate. These flag leaves were employed for RNA isolation by using Trizol reagent following the manufacturer’s protocol (Invitrogen, Karlsruhe, Germany). The RNA was further purified using RNeasy Kit (Qiagen, Hilden, Germany). RNA yield and quality were determined by using an Agilent 2100 Bioanalyzer (Agilent Techologies, Boblingen, Germany).
Label Biotin
Label protocol 5 µg of high quality total RNA were reverse transcribed using the One-Cycle cDNA Synthesis Kit (Affymetrix, Santa Clara, CA, USA). The resulting double-stranded cDNA was used as a template to generate biotin-tagged cRNA from an in vitro transcription reaction (IVT), using Affymetrix IVT Labeling Kit as Expression Analysis Technical Manual (2001, Affymetrix)
Hybridization protocol Biotin-tagged cRNA was fragmented to strands of 35 to 200 bases in length, and 15 µg of fragmented cRNA was used for each hybridization. Barley 1 GeneChips were hybridized for 16 h at 45°C with rotation in a GeneChip® Hybridization Oven 640 (Affymetrix, Santa Clara, CA, USA). The arrays were washed and stained with R-phycoerythrin streptavidin in a Fluidics Station.
Scan protocol The Arrays were subsequently scanned with Affymetrix GeneChip® Scanner 3000
Description All scanned data from barley 1 GeneChips were processed by robust multiarray average (RMA) (Irizarry et al., 2003) using ArrayAssist software version 3.4 (Stratagene, La Jolla, CA, UAS)
Data processing Normalized expression values were computed from raw CEL files by first applying the RMA model of probe-specific correction of perfect match probes. The algorithm consists of three steps—a model-based background correction stage neutralizes the effects of background noise and the processing artifacts, a subsequent quantile normalization stage aligns expression values to a common scale, and finally, an iterative median polishing procedure summarizes the data and generates a single expression value for each probe set. Resulting RMA expression values were log2-transformed. Average log signal intensity values of three biological replicates for each sample were then computed and these were used for further analysis. To identify differentially expressed genes, student's t-test was applied with a maximal FDR (false discovery rate) of 5% (Benjamini-Hochberg algorithm).
RMA data for each individual Affymetrix chip not available. Thus the Sample data tables instead report MAS5.0-processed data. A table of the average, log2 RMA signal intensity values of three biological replicates for each sample is linked as a supplementary file on the GSE15970 record.
Submission date Apr 28, 2009
Last update date May 15, 2009
Contact name Michael Baum
Phone +963 (21) 2213433
Fax +963 (21) 2213490
Organization name ICARDA
Department BIGMP
Street address ICARDA
City Aleppo
State/province Aleppo
ZIP/Postal code 5466
Country Syria
Platform ID GPL1340
Series (1)
GSE15970 Differentially Expressed Genes between Drought-tolerant and Drought-sensitive Barley Genotypes

Data table header descriptions
VALUE Signal
ABS_CALL indicating whether the transcript was present (P), absent (A), or marginal (M)

Data table
AFFX-BioB-5_at 31.2139 P 0.000509415
AFFX-BioB-M_at 23.5339 P 0.000126798
AFFX-BioB-3_at 13.62 P 0.00686653
AFFX-BioC-5_at 63.7728 P 5.16732e-05
AFFX-BioC-3_at 81.9478 P 5.16732e-05
AFFX-BioDn-5_at 168.001 P 4.42873e-05
AFFX-BioDn-3_at 412.409 P 7.00668e-05
AFFX-CreX-5_at 888.691 P 4.42873e-05
AFFX-CreX-3_at 1479.96 P 4.42873e-05
AFFX-DapX-5_at 101.354 P 5.16732e-05
AFFX-DapX-M_at 261.554 P 5.16732e-05
AFFX-DapX-3_at 470.458 P 4.42873e-05
AFFX-LysX-5_at 14.797 P 4.42873e-05
AFFX-LysX-M_at 25.197 P 0.0044838
AFFX-LysX-3_at 74.5197 P 9.4506e-05
AFFX-PheX-5_at 19.8209 P 0.000581214
AFFX-PheX-M_at 23.7261 P 0.00179591
AFFX-PheX-3_at 43.8713 P 0.00010954
AFFX-ThrX-5_at 37.4024 P 5.16732e-05
AFFX-ThrX-M_at 67.1369 P 5.16732e-05

Total number of rows: 22840

Table truncated, full table size 796 Kbytes.

Supplementary file Size Download File type/resource
GSM398258.CEL.gz 2.2 Mb (ftp)(http) CEL
GSM398258.CHP.gz 122.8 Kb (ftp)(http) CHP
Processed data included within Sample table
Processed data provided as supplementary file

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