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Auxin Homeostasis in Plant Stress Adaptation Response

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Authors
Park, Chung-Mo
Issue Date
2007-07
Citation
Plant Signaling and Behavior, Vol.2 No.4, pp.306-307
Keywords
Abscisic acidArabidopsisAuxin homeostasisGH3LightSalicylic acidStress adaptation
Abstract
Auxin plays a wide range of regulatory roles in diverse aspects of plant growth and developmental processes through a complex network of signaling interactions. In the May issue of Journal of Biological Chemistry, we have demonstrated that auxin homeostasis directly links growth regulation with stress adaptation responses through interactions with salicylic acid (SA) and abscisic acid (ABA) signals. In this signaling network, the endogenous auxin content is coordinately regulated through negative feedback by a group of auxin-inducible GH3 genes that encode auxin-conjugating enzymes. The Arabidopsis mutant wes1-D overexpressing a GH3 gene WES1 exhibits typical auxin-deficient traits, such as reduced growth and leaf curling, but is resistant to both biotic and abiotic stresses. In addition, various stress-regulated genes, including pathogenesis-related protein genes (PRs) and C-repeat/dehydration responsive element binding factor genes (CBFs), are up-regulated in the mutant. Consistent with these observations, WES1 is activated by pathogenic infections and abiotic stresses as well as by exogenous SA and ABA. We therefore propose that the WES1-mediated growth suppression would underlie the commonly observed symptoms of infected or stressed plants and provide a mechanism for auxin action in the fitness costs of induced resistance in plants.
ISSN
1559-2316
URI
https://hdl.handle.net/10371/172067
DOI
https://doi.org/10.4161/psb.2.4.4069
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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