First published online October 2, 2003; 10.1104/pp.103.024182
Plant Physiology 133:1272-1284 (2003)
© 2003 American Society of Plant Biologists
PLANTS INTERACTING WITH OTHER ORGANISMS
Pathogen-Responsive Expression of a Putative ATP-Binding Cassette Transporter Gene Conferring Resistance to the Diterpenoid Sclareol Is Regulated by Multiple Defense Signaling Pathways in Arabidopsis1
Emma J. Campbell,
Peer M. Schenk*,
Kemal Kazan,
Iris A.M.A. Penninckx,
Jonathan P. Anderson,
Don J. Maclean,
Bruno P.A. Cammue,
Paul R. Ebert and
John M. Manners
Cooperative Research Centre for Tropical Plant Protection (E.J.C., P.M.S., K.K., J.P.A., D.J.M., P.R.E., J.M.M.) and Department of Biochemistry and Molecular Biology (E.J.C., P.M.S., J.P.A., D.J.M., P.R.E.), The University of Queensland, St. Lucia, Queensland 4072, Australia; Commonwealth Scientific and Industrial Research Organization Plant Industry, Queensland Bioscience Precinct, 306 Carmody Road, St. Lucia, Queensland 4067, Australia (K.K., J.M.M.); and Centre of Microbial and Plant Genetics, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20, 3001 Leuven, Belgium (I.A.M.A.P., B.P.A.C)
The ATP-binding cassette (ABC) transporters are encoded by large gene families in plants. Although these proteins are potentially involved in a number of diverse plant processes, currently, very little is known about their actual functions. In this paper, through a cDNA microarray screening of anonymous cDNA clones from a subtractive library, we identified an Arabidopsis gene (AtPDR12) putatively encoding a member of the pleiotropic drug resistance (PDR) subfamily of ABC transporters. AtPDR12 displayed distinct induction profiles after inoculation of plants with compatible and incompatible fungal pathogens and treatments with salicylic acid, ethylene, or methyl jasmonate. Analysis of AtPDR12 expression in a number of Arabidopsis defense signaling mutants further revealed that salicylic acid accumulation, NPR1 function, and sensitivity to jasmonates and ethylene were all required for pathogen-responsive expression of AtPDR12. Germination assays using seeds from an AtPDR12 insertion line in the presence of sclareol resulted in lower germination rates and much stronger inhibition of root elongation in the AtPDR12 insertion line than in wild-type plants. These results suggest that AtPDR12 may be functionally related to the previously identified ABC transporters SpTUR2 and NpABC1, which transport sclareol. Our data also point to a potential role for terpenoids in the Arabidopsis defensive armory.
Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.103.024182.
1 This work was supported by the Fonds voor Wetenschappelijk Onderzoek Vlaanderen (postdoctoral fellowship to I.A.M.A.P.) and by the Fonds voor Wetenschappelijk Onderzoek Vlaanderen and the Cooperative Research Centre for Tropical Plant Protection (grant to I.A.M.A.P. supporting a research stay at the University of Queensland, Australia).
* Corresponding author; e-mail p.schenk{at}tpp.uq.edu.au; fax 61–7–3365–4771.
Received March 25, 2003;
returned for revision May 18, 2003;
accepted July 27, 2003.
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