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Published on September 12, 2008; 10.1104/pp.108.127845

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Received August 8, 2008
Accepted September 7, 2008

The AtrbohD-mediated oxidative burst elicited by oligogalacturonides in Arabidopsis thaliana is dispensable for the activation of defense responses effective against Botrytis cinerea

Roberta Galletti , Carine Denoux , Stefano Gambetta , Julia Dewdney , Frederick M. Ausubel , Giulia De Lorenzo , and Simone Ferrari *

Dipartimento di Biologia Vegetale, Universita di Roma "La Sapienza", Piazzale Aldo Moro, 5 00185 Rome, Italy; Dipartimento Territorio e Sistemi Agro-Forestali, Universita degli Studi di Padova, Viale dell'Universita, 16 35020 Legnaro (PD), Italy; Department of Genetics, Harvard Medical School, and Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114 USA.

* Corresponding author; email: simone.ferrari{at}uniroma1.it.

Oligogalacturonides (OGs) are endogenous elicitors of defense responses released after partial degradation of pectin in the plant cell wall. We have previously shown that in Arabidopsis thaliana OGs induce the expression of Phytoalexin Deficient 3 (PAD3) and increase resistance to the necrotrophic fungal pathogen Botrytis cinerea independently of signaling pathways mediated by jasmonate (JA), salicylic acid (SA) and ethylene (ET). Here we describe that the rapid induction of the expression of a variety of genes by OGs is also independent of SA, ET and JA. OGs elicit a robust extracellular oxidative burst that is generated by the NADPH-oxidase AtrbohD. This burst is not required for the expression of OG-responsive genes, or for OG-induced resistance to B. cinerea, whereas callose accumulation requires a functional AtrbohD. OG-induced resistance to B. cinerea is also unaffected in powdery mildew resistant 4, despite the fact that callose accumulation was almost abolished in this mutant. These results indicate that the OG-induced oxidative burst is not required for the activation of defense responses effective against B. cinerea, leaving open the question of the role of ROS in elicitor-mediated defense.




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[Abstract] [Full Text] [PDF]


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