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ROS-dependent signaling pathways in plants and algae exposed to high light: Comparisons with other eukaryotes

Mullineaux, PM and Exposito-Rodriguez, M and Laissue, PP and Smirnoff, N (2018) 'ROS-dependent signaling pathways in plants and algae exposed to high light: Comparisons with other eukaryotes.' Free Radical Biology and Medicine. ISSN 0891-5849

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Abstract Like all aerobic organisms, plants and algae co-opt reactive oxygen species (ROS) as signaling molecules to drive cellular responses to changes in their environment. In this respect, there is considerable commonality between all eukaryotes imposed by the constraints of ROS chemistry, similar metabolism in many subcellular compartments, the requirement for a high degree of signal specificity and the deployment of thiol peroxidases as transducers of oxidizing equivalents to regulatory proteins. Nevertheless, plants and algae carry out specialised signaling arising from oxygenic photosynthesis in chloroplasts and photoautotropism, which often induce an imbalance between absorption of light energy and the capacity to use it productively. A key means of responding to this imbalance is through communication of chloroplasts with the nucleus to adjust cellular metabolism. Two ROS, singlet oxygen (1O2) and hydrogen peroxide (H2O2), initiate distinct signaling pathways when photosynthesis is perturbed. 1O2, because of its potent reactivity means that it initiates but does not transduce signaling. In contrast, the lower reactivity of H2O2 means that it can also be a mobile messenger in a spatially-defined signaling pathway. How plants translate a H2O2 message to bring about changes in gene expression is unknown and therefore, we draw on information from other eukaryotes to propose a working hypothesis. The role of these ROS generated in other subcellular compartments of plant cells in response to HL is critically considered alongside other eukaryotes. Finally, the responses of animal cells to oxidative stress upon high irradiance exposure is considered for new comparisons between plant and animal cells.

Item Type: Article
Uncontrolled Keywords: Singlet oxygen, hydrogen peroxide, photosynthesis, chloroplast-to-nucleus communication, retrograde signalling, ROS-mediated signalling, high light, mitochondria, peroxisomes, microdomains, redox relay, thiol peroxidases, yeast, animal cells, plant cells
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health > Life Sciences, School of
Depositing User: Elements
Date Deposited: 02 Feb 2018 15:00
Last Modified: 19 Aug 2019 16:15

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