Abstract
In NAD-malic enzyme type C4 plants like P. mliaceum the decarboxylation in the C4 cycle proceeds via NAD-malic enzyme located in the matrix of bundle sheath mitochondria (Kagawa, Hatch 1975). The bundle sheath mitochondria have very high activity of NAD-malic enzyme while the activity in mesophyll mitochondria is considerably lower and comparable with the activity found in C3 mitochondria (Gardestrom, Edwards 1983). The properties of malate oxidation were very different between mesophyll and bundle sheath mitochondria from P. miliaceum. In mesophyll mitochondria malate oxidation was largely sensitive to cyanide while malate oxidation in bundle sheath mitochondria was almost totally insensitive to cyanide (Gardestrom, Edwards 1983).
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