Abstract
Summary • The leaf-level response of respiration in the light ( R L ) is a vital component of a plant’s energy and carbon balance. • Xanthium strumarium (common cocklebur) plants were grown in various combinations of CO 2 , nitrogen and temperature, and R L was measured using the Kok effect method. • R L was significantly lower than respiration in the dark ( R D ), with the lowest percentage inhibition in the elevated CO 2 , high-N treatment. In general R L increased in response to increased CO 2 concentration and N availability across all temperature treatments. However, there was a significant interactive effect of growth CO 2 concentration and measurement temperature on R L which indicated that R L responded more positively to temperature changes in elevated CO 2 conditions. Additionally, across all CO 2 and N treatments the percentage of respired C with respect to assimilated C increased as temperature increased. • Collectively, these results improve our understanding of the magnitude and sensitivity to foreseen environmental changes of mitochondrial respiration during light hours.
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