journal article Sep 01, 2006

Energy balance, organellar redox status, and acclimation to environmental stress

Abstract
In plants and algal cells, changes in light intensity can induce intrachloroplastic and retrograde regulation of gene expression in response to changes in the plastoquinone redox status. We review the evidence in support of the thesis that the chloroplast acts as a general sensor of cellular energy imbalance sensed through the plastoquinone pool. Alteration in cellular energy balance caused by chloroplast or mitochondrial metabolism can induce intracellular signalling to affect chloroplastic and nuclear gene expression in response, not only to light intensity, but to a myriad of abiotic stresses. In addition, this chloroplastic redox sensing also appears to have a broader impact, affecting long-distance systemic signalling related to plant growth and development. The organization of the respiratory electron transport chains of mitochondria and heterotrophic prokaryotes is comparable to that of chloroplast thylakoid membranes, and the redox state of the respiratory ubiquinone pool is a well-documented cellular energy sensor. Thus, modulation of electron transport component redox status by abiotic stress regulates organellar as well as nuclear gene expression. From the evidence presented, we suggest that the photosynthetic and respiratory machinery in prokaryotic and eukaryotic organisms have a dual function: primary cellular energy transformation, and global environmental sensing.
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119
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Published
Sep 01, 2006
Vol/Issue
84(9)
Pages
1355-1370
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Kenneth E. Wilson, Alexander G. Ivanov, Gunnar Öquist, et al. (2006). Energy balance, organellar redox status, and acclimation to environmental stress. Canadian Journal of Botany, 84(9), 1355-1370. https://doi.org/10.1139/b06-098
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