期刊
PLANT MOLECULAR BIOLOGY
卷 70, 期 1-2, 页码 79-102出版社
SPRINGER
DOI: 10.1007/s11103-009-9458-1
关键词
as-1 Element; Glutaredoxin; NPR1; Salicylic acid; SA-induced genes; TGA factors
资金
- FONDECYT-CONICYT [1060494]
- Millennium Science Initiative [P06-009-F]
- ANPCyT [BID 1728/OC AR, PICT 32637]
- CONICET
- SECyT-UNC
- CONICYT/SECyT [2005-7-186]
Salicylic acid (SA) is a stress-induced hormone involved in the activation of defense genes. Here we analyzed the early genetic responses to SA of wild type and npr1-1 mutant Arabidopsis seedlings, using Complete Arabidopsis Transcriptome MicroArray (CATMAv2) chip. We identified 217 genes rapidly induced by SA (early SAIGs); 193 by a NPR1-dependent and 24 by a NPR1-independent pathway. These two groups of genes also differed in their functional classification, expression profiles and over-representation of cis-elements, supporting differential pathways for their activation. Examination of the expression patterns for selected early SAIGs from both groups indicated that their activation by SA required TGA2/5/6 subclass of transcription factors. These genes were also activated by Pseudomonas syringae pv. tomato AvrRpm1, suggesting that they might play a role in defense against bacteria. This study gives a global idea of the early response to SA in Arabidopsis seedlings, expanding our knowledge about SA function in plant defense.
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