A few studies have been carried out on UV-B effects on cell respiration. Bassman et al. (2003) reported that crops responded to enhanced UV-B radiation with either increasing cell respiration or with no change. Germ et al. (2004) claimed that an increase in cell respiration is related to the greater need for energy to protect against UV-B and for repair of UV-B damage. Sharma et al. (1998) reported that enhanced UV-B radiation might induce gene expression for the enzymes cytochrome oxidase, manganese dismutase and peptidase, all of which are involved in cell respiration.
On the other hand, some recent findings revealed depressed cell respiration resulting from enhanced UV-B radiation. Studies of respiratory potential for common buckwheat, tartary buckwheat and pumpkin under irradiation indicated lower terminal electron transport (ETS) activity and thus lower respiration (Germ et al. 2005; Breznik 2007, unpublished). The reason for the inhibitory effect of enhanced UV-B radiation on ETS activity is not clear. However, Lukaszek and Poskuta (1996) provided an evidence for damage of mitochondrial structures that might result in decreased respiration.
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