Systemic and Intracellular responses to PhotoOxidative Sress in Arabidopsis
Date
2007
Authors
Rossel, Jan Bart
Wilson, Philippa
Hussain, Dawar
Woo, Nicholas
Gordon, Matthew
Mewett, Osman
Howell, Katharine A
Whelan, James M
Kazan, Kemal
Pogson, Barry
Journal Title
Journal ISSN
Volume Title
Publisher
American Society of Plant Biologists
Abstract
As the sun tracks daily through the sky from east to west, different parts of the canopy are exposed to high light (HL). The extent of and mechanisms by which a systemic acquired acclimation (SAA) response might preacclimate shaded leaves that will be subsequently exposed to full sunlight is largely undefined. We investigated the role of an Arabidopsis thaliana zinc finger transcription factor, ZAT10, in SAA. ZAT10 overexpression resulted in enhanced tolerance to photoinhibitory light and exogenous H2O2, increased expression of antioxidative genes whose products are targeted to multiple subcellular compartments. Partial HL exposure of a leaf or leaves rapidly induced ZAT10 mRNA in distal, shaded photosynthetic tissues, including the floral stem, cauline leaves, and rosette, but not in roots. Fully 86% of fivefold HL-upregulated and 71% of HL-downregulated genes were induced and repressed, respectively, in distal, shaded leaves. Between 15 and 23% of genes whose expression changed in the HL and/or distal tissues were coexpressed in the ZAT10 overexpression plants, implicating ZAT10 in modulating the expression of SAA-regulated genes. The SAA response was detectable in plants with mutations in abscisic acid, methyl jasmonate, or salicylic acid synthesis or perception, and systemic H2O2 diffusion was not detected. Hence, SAA is distinct from pathogen-stimulated systemic acquired resistance and apparently involves a novel signal or combination of signals that preacclimate photosynthetic tissues to HL.
Description
Keywords
Keywords: Abscisic acid; Arabidopsis; Floral stem; Overexpression; Cells; Photosynthesis; Plants (botany); Gene expression; abscisic acid; acetic acid derivative; Arabidopsis protein; cyclopentane derivative; hydrogen peroxide; jasmonic acid methyl ester; oxylipin;
Citation
Collections
Source
The Plant Cell
Type
Journal article
Book Title
Entity type
Access Statement
License Rights
Restricted until
2037-12-31
Downloads
File
Description