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Abstract
Illumination of Chlorella vulgaris 11 h cells which had been preincubated in the dark caused conversion of NAD + to NADP +. This conversion was saturated at relatively low light intensity. Both red and blue light were effective but green and far-red light showed only slight effect. 3-(4-Chlorophenyl)-1,1-dimethyl urea, disalicylidene propanediamine and carbonylcyanide 3-chlorophenylhydrazone inhibited the light-induced conversion. No conversion was induced by illumination with far-red light in an N 2 atmosphere, although the ATP-level rose quickly. Likewise, chlorophyll-less yellow mutant strains, C. vulgaris 211-11 h 20 cells did not show light-induced conversion. These results indicate that the conversion of NAD + to NADP + is associated with both photosynthetic electron transport and photophosphorylation. Active conversion was observed during the induction period of CO 2 fixation.
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