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Biochemical aspects of circadian rhythms were studied using a long-day duckweed, Lemna gibba G3 cultured in short day condition (9 h light at 3800 lux followed by 15 h darkness), which was transferred in continuous light (LL) at the end (LL 0) of the last night period. With such a system I have previously reported a rhythm of affinity for NAD +  of cytoplasmic NAD - dependent glyceraldehyde 3-phosphate dehydrogenase (Cyt-NAD -GPD ) 180° out of phase with that of affinity for NADP +  of chloroplastic NADP-dependent GPD (Chl-NADP-GPD ) and that NADP +  could increase in vitro the affinity for NADP +  of Chl-NADP-GPD . I report here that NADP +  can decrease in vitro the affinity for NAD +  of Cyt-NAD -GPD as well, and furthermore, that the in vivo level of NADP +  oscillates in phase with the rhythm of the affinity for NADP +  of Chl-NADP-GPD.

Causal Relationships among Metabolic Circadian Rhythms in Lemna