This Article Full Text Full Text (PDF) All Versions of this Article: 142/4/1559    most recent pp.106.086223v1 Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Related articles in Plant Physiol. Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Web of Science (14) Citing Articles via Google Scholar Google Scholar Articles by Kariola, T. Articles by Palva, E. T. Search for Related Content PubMed PubMed Citation Articles by Kariola, T. Articles by Palva, E. T. Agricola Articles by Kariola, T. Articles by Palva, E. T.

ENVIRONMENTAL STRESS AND ADAPTATION TO STRESS

EARLY RESPONSIVE TO DEHYDRATION 15, a Negative Regulator of Abscisic Acid Responses in Arabidopsis¹

Viikki Biocenter, Department of Biological and Environmental Sciences, Division of Genetics, University of Helsinki, FIN–00014, Helsinki, Finland

EARLY RESPONSIVE TO DEHYDRATION 15 (ERD15) is rapidly induced in response to various abiotic and biotic stress stimuli in Arabidopsis (Arabidopsis thaliana). Modulation of ERD15 levels by overexpression or RNAi silencing altered the responsiveness of the transgenic plants to the phytohormone abscisic acid (ABA). Overexpression of ERD15 reduced the ABA sensitivity of Arabidopsis manifested in decreased drought tolerance and in impaired ability of the plants to increase their freezing tolerance in response to this hormone. In contrast, RNAi silencing of ERD15 resulted in plants that were hypersensitive to ABA and showed improved tolerance to both drought and freezing, as well as impaired seed germination in the presence of ABA. The modulation of ERD15 levels not only affected abiotic stress tolerance but also disease resistance: ERD15 overexpression plants showed improved resistance to the bacterial necrotroph Erwinia carotovora subsp. carotovora accompanied with enhanced induction of marker genes for systemic acquired resistance. We propose that ERD15 is a novel mediator of stress-related ABA signaling in Arabidopsis.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: E. Tapio Palva (tapio.palva{at}helsinki.fi).

www.plantphysiol.org/cgi/doi/10.1104/pp.106.086223

^* Corresponding author; e-mail tapio.palva{at}helsinki.fi; fax 358–9–19159076.

Received July 3, 2006; accepted October 12, 2006; published October 20, 2006.

Related articles in Plant Physiol.:

On the Inside

Peter V. Minorsky
Plant Physiol. 2006 142: 1341-1342. [Full Text]  

This article has been cited by other articles:

				C. Sirichandra, A. Wasilewska, F. Vlad, C. Valon, and J. Leung The guard cell as a single-cell model towards understanding drought tolerance and abscisic acid action J. Exp. Bot., April 1, 2009; 60(5): 1439 - 1463. [Abstract] [Full Text] [PDF]

				A. Welling and E. T. Palva Involvement of CBF Transcription Factors in Winter Hardiness in Birch Plant Physiology, July 1, 2008; 147(3): 1199 - 1211. [Abstract] [Full Text] [PDF]

				A. Wasilewska, F. Vlad, C. Sirichandra, Y. Redko, F. Jammes, C. Valon, N. F. d. Frey, and J. Leung An Update on Abscisic Acid Signaling in Plants and More ... Mol Plant, March 1, 2008; 1(2): 198 - 217. [Abstract] [Full Text] [PDF]