Figure 3.

Developmental changes in the capacity of respiratory pathways in cotyledon mitochondria. A, Changes in capacities of Cyt and alternative (Alt) pathways in mitochondria isolated from different-age cotyledons from plants grown at a light intensity of 120 μmol photons m⁻² s⁻¹. Results represent the means of two or three measurements on one mitochondrial sample. B, Changes in capacities of Cyt and alternative pathways in mitochondria isolated from different-age cotyledons from plants grown at a light intensity of 380 μmol photons m⁻² s⁻¹. Results represent the means of two to six measurements on one mitochondrial sample. C, Comparison of the activity of the alternative pathway in isolated mitochondria oxidizing NADH as a substrate in the absence or presence of exogenous pyruvate (Pyr). Growth conditions were as in A. Each data point represents one measurement on one mitochondrial sample.