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Arabidopsis DMR6 encodes a putative 2OG‐Fe(II) oxygenase that is defense‐associated but required for susceptibility to downy mildew

Arabidopsis DMR6 encodes a putative 2OG‐Fe(II) oxygenase that is defense‐associated but required... The Arabidopsis mutant downy mildew resistant 6 (dmr6) carries a recessive mutation that results in the loss of susceptibility to Hyaloperonospora parasitica. Here we describe the map‐based cloning of DMR6 (At5g24530), which was found to encode a 2‐oxoglutarate (2OG)‐Fe(II) oxygenase of unknown function. DMR6 transcription is locally induced during infections with both compatible and incompatible H. parasitica isolates. High DMR6 transcript levels were also observed in constitutive defense mutants and after treatment with salicylic acid analog BTH, suggesting that DMR6 has a role during plant defense. Expression analysis of dmr6 mutants, using DNA microarrays and quantitative PCR, showed the enhanced expression of a subset of defense‐associated genes, including DMR6 itself, suggesting dmr6‐mediated resistance results from the activation of plant defense responses. Alternatively, resistance could be caused by the accumulation of a toxic DMR6 substrate, or by the absence of a DMR6 metabolic product that is required for H. parasitica infection. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Plant Journal Wiley

Arabidopsis DMR6 encodes a putative 2OG‐Fe(II) oxygenase that is defense‐associated but required for susceptibility to downy mildew

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References (38)

Publisher
Wiley
Copyright
Copyright © 2008 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0960-7412
eISSN
1365-313X
DOI
10.1111/j.1365-313X.2008.03427.x
pmid
18248595
Publisher site
See Article on Publisher Site

Abstract

The Arabidopsis mutant downy mildew resistant 6 (dmr6) carries a recessive mutation that results in the loss of susceptibility to Hyaloperonospora parasitica. Here we describe the map‐based cloning of DMR6 (At5g24530), which was found to encode a 2‐oxoglutarate (2OG)‐Fe(II) oxygenase of unknown function. DMR6 transcription is locally induced during infections with both compatible and incompatible H. parasitica isolates. High DMR6 transcript levels were also observed in constitutive defense mutants and after treatment with salicylic acid analog BTH, suggesting that DMR6 has a role during plant defense. Expression analysis of dmr6 mutants, using DNA microarrays and quantitative PCR, showed the enhanced expression of a subset of defense‐associated genes, including DMR6 itself, suggesting dmr6‐mediated resistance results from the activation of plant defense responses. Alternatively, resistance could be caused by the accumulation of a toxic DMR6 substrate, or by the absence of a DMR6 metabolic product that is required for H. parasitica infection.

Journal

The Plant JournalWiley

Published: Jun 1, 2008

Keywords: ; ; ; ; ;

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