Early genomic responses to salicylic acid in Arabidopsis

Blanco F.; Salinas P.; Cecchini, NM; Jordana, X; Van Hummelen, P; Alvarez, ME; Holuigue, L

Abstract

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.

Más información

Título según WOS: Early genomic responses to salicylic acid in Arabidopsis
Título según SCOPUS: Early genomic responses to salicylic acid in Arabidopsis
Título de la Revista: PLANT MOLECULAR BIOLOGY
Volumen: 70
Número: 01-feb
Editorial: Springer
Fecha de publicación: 2009
Página de inicio: 79
Página final: 102
Idioma: English
URL: http://link.springer.com/10.1007/s11103-009-9458-1
DOI:

10.1007/s11103-009-9458-1

Notas: ISI, SCOPUS