Figure 4. Circadian gating and photoperiodic control of photoinduced commitment to cell division in E.

Figure 4

Circadian gating and photoperiodic control of photoinduced commitment to cell division in E. gracilis Z. Cultures were entrained to LD:14,10 and then given a final photoperiod that was shortened to 8 h before being released into DD. Subsequently, the cells were given a 6-h light-break at various CTs (a so-called “night-interruption” experiment). Upper panel: factorial increase (ss) in cell population growth induced by a given light pulse. Lower panel: each row indicates the timing of the 6-h night-break during the extended long-night DD (T ranges, hours after onset of the “subjective” LD cycle is shown by the white and hatched bars between the panels, denoting the phase of the prior LD:14,10 cycle had it been continued. Data (closed circles) were plotted at the middle of the night-breaks, and horizontal lines through them show their duration (6 h). Numbers below each data point indicate the number of experimental replicates; the SEM was so small that the error bars are hidden within the data points. Reprinted with permission from: Hagiwara S, Bolige A, Zhang Y et al. Photochem Photobiol 2002; 76:105-115. © American Society for Photobiology.

From: Circadian Organization in the Algal Flagellate Euglena

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