Summary
Atmospheric CO2 concentrations have been increasing since the industrial revolution due to fossil fuel burning and deforestation. Elevated levels of atmospheric [CO2] are likely to enhance photosynthesis and plant growth, which, in turn should result in increased specific and whole-plant respiration rates. However, a large body of literature has shown that specific respiration rates of plant tissues can be considerably reduced when plants are exposed to or grown at high [CO2]. Reductions in respiration by [CO2] have been explained by either direct inhibitory effects of [CO2] on respiratory processes or by indirect effects associated with changes in the chemical composition of tissues of plants grown at high [CO2]. The observed reductions in plant respiration rates by elevated [CO2] can represent a large biospheric sink for atmospheric carbon. Although doubling current ambient levels of atmospheric [CO2] could inhibit some mitochondrial enzymes directly in the short-term, the magnitude of the direct effect of [CO2] on tissue respiration has now been shown to be largely explained by measurement artifacts, diminishing the impact that direct effects would have on the carbon cycle. A reduction in construction and maintenance costs of tissues of plants grown at high [CO2] can explain an indirect reduction of respiration. Such indirect effects, however, may be offset by the larger biomass of plants exposed to elevated [CO2]. A lack of clear understanding of the physiological control of plant respiration, of the role(s) of non-phosphorylating pathways, and effects associated with plant size, makes it difficult to predict how respiration and the processes it supports respond to elevated [CO2]. Therefore, the role of plant respiration in augmenting or controlling the sink capacity of terrestrial ecosystems is still uncertain.
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Gonzàlez-Meler, M.A., Taneva, L. (2005). Integrated Effects of Atmospheric CO2 Concentration on Plant and Ecosystem Respiration. In: Lambers, H., Ribas-Carbo, M. (eds) Plant Respiration. Advances in Photosynthesis and Respiration, vol 18. Springer, Dordrecht. https://doi.org/10.1007/1-4020-3589-6_13
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