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The high light response in arabidopsis involves ABA signaling between vascular and bundle sheath cells<sup>W</sup>

Galvez-Valdivieso, G and Fryer, MJ and Lawson, T and Slattery, K and Truman, W and Smirnoff, N and Asami, T and Davies, WJ and Jones, AM and Baker, NR and Mullineaux, PM (2009) 'The high light response in arabidopsis involves ABA signaling between vascular and bundle sheath cells<sup>W</sup>.' Plant Cell, 21 (7). 2143 - 2162. ISSN 1040-4651

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Previously, it has been shown that Arabidopsis thaliana leaves exposed to high light accumulate hydrogen peroxide (H2O2) in bundle sheath cell (BSC) chloroplasts as part of a retrograde signaling network that induces ASCORBATE PEROXIDASE2 (APX2). Abscisic acid (ABA) signaling has been postulated to be involved in this network. To investigate the proposed role of ABA, a combination of physiological, pharmacological, bioinformatic, and molecular genetic approaches was used. ABA biosynthesis is initiated in vascular parenchyma and activates a signaling network in neighboring BSCs. This signaling network includes the Ga subunit of the heterotrimeric G protein complex, the OPEN STOMATA1 protein kinase, and extracellular H2O 2, which together coordinate with a redox-retrograde signal from BSC chloroplasts to activate APX2 expression. High light-responsive genes expressed in other leaf tissues are subject to a coordination of chloroplast retrograde signaling and transcellular signaling activated by ABA synthesized in vascular cells. ABA is necessary for the successful adjustment of the leaf to repeated episodes of high light. This process involves maintenance of photochemical quenching, which is required for dissipation of excess excitation energy. © 2009 American Society of Plant Biologists.

Item Type: Article
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health > Life Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 16 Sep 2011 09:02
Last Modified: 27 Sep 2021 16:15

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