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Transcriptional regulation by an NAC (NAM-ATAF1,2-CUC2) transcription factor attenuates ABA signalling for efficient basal defence towardsBlumeria graminisf. sp.hordeiin Arabidopsis
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Jensen, Michael K., Hagedorn, Peter H., de Torres-Zabala, Marta, Grant, Murray, Rung, Jesper H., Collinge, David B. and Lyngkjaer, Michael F. (2008) Transcriptional regulation by an NAC (NAM-ATAF1,2-CUC2) transcription factor attenuates ABA signalling for efficient basal defence towardsBlumeria graminisf. sp.hordeiin Arabidopsis. The Plant Journal, 56 (6). pp. 867-880. doi:10.1111/j.1365-313X.2008.03646.x ISSN 0960-7412.
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Official URL: http://dx.doi.org/10.1111/j.1365-313X.2008.03646.x
Abstract
ATAF1 is a member of a largely uncharacterized plant-specific gene family encoding NAC transcription factors, and is induced in response to various abiotic and biotic stimuli in Arabidopsis thaliana. Previously, we showed that a mutant allele of ATAF1 compromises penetration resistance in Arabidopsis with respect to the non-host biotrophic pathogen Blumeria graminis f. sp. hordei (Bgh). In this study, we have used genome-wide transcript profiling to characterize signalling perturbations in ataf1 plants following Bgh inoculation. Comparative transcriptomic analyses identified an over-representation of abscisic acid (ABA)-responsive genes, including the ABA biosynthesis gene AAO3, which is significantly induced in ataf1 plants compared to wild-type plants following inoculation with Bgh. Additionally, we show that Bgh inoculation results in decreased endogenous ABA levels in an ATAF1-dependent manner, and that the ABA biosynthetic mutant aao3 showed increased penetration resistance to Bgh compared to wild-type plants. Furthermore, we show that ataf1 plants show ABA-hyposensitive phenotypes during seedling development and germination. Our data support a negative correlation between ABA levels and penetration resistance, and identify ATAF1 as a new stimuli-dependent attenuator of ABA signalling for the mediation of efficient penetration resistance in Arabidopsis upon Bgh attack.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||
Journal or Publication Title: | The Plant Journal | ||||
Publisher: | Wiley-Blackwell Publishing Ltd. | ||||
ISSN: | 0960-7412 | ||||
Official Date: | 2008 | ||||
Dates: |
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Volume: | 56 | ||||
Number: | 6 | ||||
Page Range: | pp. 867-880 | ||||
DOI: | 10.1111/j.1365-313X.2008.03646.x | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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