Abstract

Two major timing devices probably control the temporal changes in activity of cytoplasmic NAD- and chloroplast NADP-GPDs in the long-day plant Lemna gibba G3; one is an oscillator and the other an hourglass. The former is reset by a light-on signal and responsible for diurnal changes in activities of GPDs in continuous light, while the latter is reset by a light-off signal to control sigmoidal changes in activities of GPDs in continuous darkness. The activities of Cyt-NAD-GPD and Chl-NADP-GPD always change mutually inversely.

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