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IN BRIEF

Systemic Acquired Acclimation to High Light

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Different parts of the canopy are exposed to potentially damaging full sunlight as the sun tracks from east to west. Rossel et al. (pages 4091–4110) investigate a novel photoprotective signaling system in Arabidopsis by which exposed leaves could signal to and thereby preacclimate shaded leaves, which is known as systemic acquired acclimation (SAA). They show that a systemic signal is rapidly transmitted from high-lighted exposed to distal shaded leaves, resulting in very similar changes in global gene expression. It is further shown that SAA is associated with an acclimatory response that enhances tolerance to oxidative damage, and the zinc finger transcription factor ZAT10 plays a role in this response. High light exposure rapidly induced ZAT10 expression in exposed and distal photosynthetic tissues but not roots (see figure). ZAT10 overexpression results in enhanced tolerance to photoinhibitory light and exogenous H₂O₂ and increased expression of antioxidative genes. Results from a number of signaling and hormone-deficient mutants indicated that SAA is distinct from pathogen-related systemic acquired resistance. This work shows that SAA involves a novel signal or combination of signals that can preacclimate photosynthetic tissues to high light.

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www.plantcell.org/cgi/doi/10.1105/tpc.108.191211

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Plant Cell 2007 19: 4091-4110. [Abstract] [Full Text]  

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Related articles in Plant Cell Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Eckardt, N. A. Search for Related Content PubMed Articles by Eckardt, N. A. Agricola Articles by Eckardt, N. A.