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Chloroplast Signaling and<i>LESION SIMULATING DISEASE1</i>Regulate Crosstalk between Light Acclimation and Immunity in<i>Arabidopsis</i>

Mühlenbock, Per and Szechyńska-Hebda, Magdalena and Płaszczyca, Marian and Baudo, Marcela and Mateo, Alfonso and Mullineaux, Philip M and Parker, Jane E and Karpińska, Barbara and Karpiński, Stanisław (2008) 'Chloroplast Signaling and<i>LESION SIMULATING DISEASE1</i>Regulate Crosstalk between Light Acclimation and Immunity in<i>Arabidopsis</i>.' The Plant Cell, 20 (9). pp. 2339-2356. ISSN 1040-4651

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Abstract

<jats:title>Abstract</jats:title><jats:p>Plants are simultaneously exposed to abiotic and biotic hazards. Here, we show that local and systemic acclimation in Arabidopsis thaliana leaves in response to excess excitation energy (EEE) is associated with cell death and is regulated by specific redox changes of the plastoquinone (PQ) pool. These redox changes cause a rapid decrease of stomatal conductance, global induction of ASCORBATE PEROXIDASE2 and PATHOGEN RESISTANCE1, and increased production of reactive oxygen species (ROS) and ethylene that signals through ETHYLENE INSENSITIVE2 (EIN2). We provide evidence that multiple hormonal/ROS signaling pathways regulate the plant's response to EEE and that EEE stimulates systemic acquired resistance and basal defenses to virulent biotrophic bacteria. In the Arabidopsis LESION SIMULATING DISEASE1 (lsd1) null mutant that is deregulated for EEE acclimation responses, propagation of EEE-induced programmed cell death depends on the plant defense regulators ENHANCED DISEASE SUSCEPTIBILITY1 (EDS1) and PHYTOALEXIN DEFICIENT4 (PAD4). We find that EDS1 and PAD4 operate upstream of ethylene and ROS production in the EEE response. The data suggest that the balanced activities of LSD1, EDS1, PAD4, and EIN2 regulate signaling of programmed cell death, light acclimation, and holistic defense responses that are initiated, at least in part, by redox changes of the PQ pool.</jats:p>

Item Type: Article
Uncontrolled Keywords: Chloroplasts; Arabidopsis; Reactive Oxygen Species; Plastoquinone; Carboxylic Ester Hydrolases; Peroxidases; DNA-Binding Proteins; Receptors, Cell Surface; Arabidopsis Proteins; Transcription Factors; Reverse Transcriptase Polymerase Chain Reaction; Signal Transduction; Gene Expression Regulation, Plant; Oxidation-Reduction; Light; Models, Biological
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health
Faculty of Science and Health > Life Sciences, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 06 Oct 2011 14:54
Last Modified: 23 Sep 2022 18:28
URI: http://repository.essex.ac.uk/id/eprint/888

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