Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Published on November 17, 2006; 10.1104/pp.106.086637

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Received July 12, 2006
Accepted November 12, 2006

AtERF14, a Member of the ERF Family of Transcription Factors, Plays a Non-redundant Role in Plant Defense

Luis Oñate-Sánchez , Jonathan P. Anderson , Jodi Young , and Karam B. Singh *

CSIRO Plant Industry, Floreat, Western Australia, Australia
CSIRO Plant Industry, Floreat, Western Australia, Australia; Murdoch University, Murdoch, Western Australia, Australia

* Corresponding author; email: karam.singh{at}csiro.au.

We had previously shown that several transcription factors of the ERF family were induced with different but overlapping kinetics following challenge of Arabidopsis thaliana with Pseudomonas syringae pv. tomato DC3000 (avrRpt2). One of these genes, a transcriptional activator, AtERF14, was induced at the same time as ERF-target genes (ChiB, basic chitinase). To unravel the potential function of AtERF14 in regulating the plant defense response we have analyzed gain and loss of function mutants. We show here that AtERF14 has a prominent role in the plant defense response since over-expression of AtERF14 had dramatic effects on both plant phenotype and defense gene expression and AtERF14 loss-of-function mutants showed impaired induction of defense genes following exogenous ethylene treatment and increased susceptibility to Fusarium oxysporum. Moreover, the expression of other ERF genes involved in defense and ethylene/JA responses, such as ERF1 and AtERF2, depends on AtERF14 expression. While a number of ERFs have been shown to function in the defense response through over-expression, this is the first ERF transcriptional activator shown to affect defense gene expression and pathogen resistance in loss-of-function mutants and to regulate the expression of other ERF genes. These results suggest a unique role for AtERF14 in regulating the plant defense response.




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