The transcription factor ATAF2 represses the expression of pathogenesis‐related genes in Arabidopsis

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<jats:title>Summary</jats:title><jats:p>ATAF2, a member of the plant‐specific NAC‐domain transcription factor family, is highly induced in leaves at a wound site and is responsive to the wound‐related phytohormones methyl jasmonate and salicylic acid, but not to abscisic acid. Overexpression of <jats:italic>ATAF2</jats:italic> leads to an increased biomass and yellowing of the leaves, but there is no obvious phenotype in two independent <jats:italic>ATAF2</jats:italic> T‐DNA insertion lines. At the transcriptome level, <jats:italic>ATAF2</jats:italic> overexpression resulted in repression of a number of pathogenesis‐related proteins. Conversely, four of these pathogenesis‐related transcripts were increased in both <jats:italic>ATAF2</jats:italic> knock‐out lines. <jats:italic>ATAF2</jats:italic> overexpressing plants showed a higher susceptibility to the soil‐borne fungal pathogen <jats:italic>Fusarium oxysporum</jats:italic>. Our results indicate that <jats:italic>ATAF2</jats:italic> functions as a repressor of pathogenesis‐related proteins in Arabidopsis.</jats:p>

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