Analysis of epidermis- and mesophyll-specific transcript accumulation in powdery mildew-inoculated wheat leaves.
Powdery mildew is an important disease of wheat caused by the obligate biotrophic fungus Blumeria graminis f. sp. tritici. This pathogen invades exclusively epidermal cells after penetrating directly through the cell wall. Because powdery mildew colonizes exclusively epidermal cells, it is of importance not only to identify genes which are activated, but also to monitor tissue specificity of gene activation. Acquired resistance of wheat to powdery mildew can be induced by a previous inoculation with the non-host pathogen B. graminis f. sp. hordei, the causal agent of barley powdery mildew. The establishment of the resistant state is accompanied by the activation of genes. Here we report the tissue-specific cDNA-AFLP analysis and cloning of transcripts accumulating 6 and 24 h after the resistance-inducing inoculation with B. graminis f. sp. hordei. A total of 25,000 fragments estimated to represent about 17,000 transcripts were displayed. Out of these, 141 transcripts, were found to accumulate after Bgh inoculation using microarray hybridization analysis. Forty-four accumulated predominantly in the epidermis whereas 76 transcripts accumulated mostly in mesophyll tissue.
Bruggmann
Rémy
R
Institute of Plant Biology, University of Zurich, Zürich, Switzerland.
Abderhalden
Olaf
O
Reymond
Philippe
P
Dudler
Robert
R
D001203:Ascomycota / Q000254:growth & development*; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant; D021141:Nucleic Acid Amplification Techniques / Q000379:methods; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods; D019441:Plant Epidermis / Q000235:genetics* / Q000382:microbiology; D018515:Plant Leaves / Q000235:genetics* / Q000382:microbiology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D015203:Reproducibility of Results; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D014158:Transcription, Genetic / Q000235:genetics; D015533:Transcriptional Activation; D014908:Triticum / Q000235:genetics* / Q000382:microbiology
D018076:DNA, Complementary; D012333:RNA, Messenger