5 mM D-glucose-6-phosphate, 12 units mL-1 malate dehydrogenase, and 4 mM phosphoenolpyruvate). NADH consumption was monitored ... Cousins AB, Badger MR, von Caemmerer S. C4 photosynthetic isotope exchange in NAD-ME- and NADP-ME-type grasses. J Exp Bot. 2008 ... and 20 units mL-1 glycerol-3-phosphodehydrogenase). Rubisco activity was calculated from the consumption of NADH, which was ... Three major subtypes of C4 photosynthesis are recognized as (1) NADP-ME, (2) NAD-ME, and (3) PEPCK, named for the primary ...