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PMID: 19571312 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Abscisic acid has a key role in modulating diverse plant-pathogen interactions.

Plant physiology ·Vol. 150 ·No. 4 ·2009-08-00 ·Pages 1750-61

Fan J, Hill L, Crooks C, Doerner P, Lamb C

Abstract

We isolated an activation-tagged Arabidopsis (Arabidopsis thaliana) line, constitutive disease susceptibility2-1D (cds2-1D), that showed enhanced bacterial growth when challenged with various Pseudomonas syringae strains. Systemic acquired resistance and systemic PATHOGENESIS-RELATED GENE1 induction were also compromised in cds2-1D. The T-DNA insertion adjacent to NINE-CIS-EPOXYCAROTENOID DIOXYGENASE5 (NCED5), one of six genes encoding the abscisic acid (ABA) biosynthetic enzyme NCED, caused a massive increase in transcript level and enhanced ABA levels >2-fold. Overexpression of NCED genes recreated the enhanced disease susceptibility phenotype. NCED2, NCED3, and NCED5 were induced, and ABA accumulated strongly following compatible P. syringae infection. The ABA biosynthetic mutant aba3-1 showed reduced susceptibility to virulent P. syringae, and ABA, whether through exogenous application or endogenous accumulation in response to mild water stress, resulted in increased bacterial growth following challenge with virulent P. syringae, indicating that ABA suppresses resistance to P. syringae. Likewise ABA accumulation also compromised resistance to the biotrophic oomycete Hyaloperonospora arabidopsis, whereas resistance to the fungus Alternaria brassicicola was enhanced in cds2-1D plants and compromised in aba3-1 plants, indicating that ABA promotes resistance to this necrotroph. Comparison of the accumulation of salicylic acid and jasmonic acid in the wild type, cds2-1D, and aba3-1 plants challenged with P. syringae showed that ABA promotes jasmonic acid accumulation and exhibits a complex antagonistic relationship with salicylic acid. Our findings provide genetic evidence that the abiotic stress signal ABA also has profound roles in modulating diverse plant-pathogen interactions mediated at least in part by cross talk with the jasmonic acid and salicylic acid biotic stress signal pathways.

MeSH Terms
Abscisic Acid/metabolism Alleles Arabidopsis/enzymology,genetics,microbiology Arabidopsis Proteins/metabolism Cyclopentanes/metabolism Dioxygenases Genes, Dominant Genes, Plant Host-Pathogen Interactions Immunity, Innate/genetics Mutation/genetics Oxygenases/metabolism Oxylipins/metabolism Phenotype Plant Diseases/genetics,immunology,microbiology Plant Proteins Pseudomonas syringae/physiology Salicylic Acid/metabolism
Chemicals
Arabidopsis Proteins Cyclopentanes Oxylipins Plant Proteins jasmonic acid Abscisic Acid Oxygenases Dioxygenases 9-cis-epoxy-carotenoid dioxygenase Salicylic Acid
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Fan Jun
Department of Disease and Stress Biology , John Innes Centre, Norwich NR4 7UH, United Kingdom.
Hill Lionel
Crooks Casey
Doerner Peter
Lamb Chris
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Article Info
Journal
Plant physiology
Abbr.
Plant Physiol
ISSN
0032-0889
Published
2009-08-00
Epub
2009-00-01
Pages
1750-61
Language
English
Region
United States
NLM ID
0401224
PMCID
PMC2719142
Subset
IM
Grants
Biotechnology and Biological Sciences Research Council · United Kingdom
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