[The light-induced increase in the activity of NADP(+)-dependent glyceraldehyde-3-phosphate-dehydrogenase : V. Marine algae].

1. NADP(+)-dependent GPD was clearly active in 8 out of 13 Rhodophyta and in 5 out of 8 Phaeophyta tested. 2. NAD(+)-specific GPD was detectable in all of the 6 red algae analysed and in the 3 brown algae tested. 3. Aldolase-activity was found unequivocally in 8 out of 10 red algae and in 7 out of 8 brown algae. 4. It is concluded that the absence of these enzymes is not a characteristic for these groups of algae. 5. Light increases the activity of the NADP(+)-dependent GPD in species of Chlorophyta and Rhodophyta, and probably also in species of Phaeophyta.