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The plant immunity regulating F-box protein CPR1 supports plastid function in absence of pathogens

Hedtmann C, Guo W, Reifschneider E, Heiber I, Hiltscher H, van Buer J, Barsch A, Niehaus K, Rowan B, Lortzing T, Steppuhn A, Baier M – 2017

The redox imbalanced 6 mutant (rimb6) of Arabidopsis thaliana was isolated in a genetic screening approach for mutants with defects in chloroplast-to-nucleus redox signaling. It has an atypically low activation status of the 2-Cys peroxiredoxin-A promoter in the seedling stage. rimb6 shows wildtype-like germination, seedling development and greening, but slower growth and reduced biomass in the rosette stage. Mapping of the casual mutation revealed that rimb6 carries a single nucleotide polymorphism in the gene encoding CONSTITUTIVE EXPRESSER OF PATHOGENESIS RELATED (PR) GENES 1, CPR1 (At4g12560), leading to a premature stop codon. CPR1 is known as a repressor of pathogen signaling and regulator of microtubule organization. Allelism of rimb6 and cpr1 revealed a function of CPR1 in chloroplast stress protection. Expression studies in pathogen signaling mutants demonstrated that CPR1-mediated activation of genes for photosynthesis and chloroplast antioxidant protection is, in contrast to activation of pathogen responses, regulated independently from PAD4-controlled salicylic acid (SA) accumulation. We conclude that the support of plastid function is a basic, SA-independent function of CPR1.

Title
The plant immunity regulating F-box protein CPR1 supports plastid function in absence of pathogens
Author
Hedtmann C, Guo W, Reifschneider E, Heiber I, Hiltscher H, van Buer J, Barsch A, Niehaus K, Rowan B, Lortzing T, Steppuhn A, Baier M
Publisher
Frontiers Research Foundation
Keywords
Arabidopsis; CPR1; chloroplast; reactive oxygen species; redox imbalanced mutant; signaling
Date
2017
Identifier
doi: 10.3389/fpls.2017.01650
Appeared in
Frontiers in Plant Science, 8: 1650
Language
eng
Type
Text
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