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F parameters are rhythmic in a range of plants. A, Petunia, , and C. blumei. B, Wild barley cv Bowman and cv Bowman(eam8). Plants were grown in LD for 4 weeks and then transferred to LL, and F measurements were taken every 2 h. Left graphs show circadian rhythms, and right graphs show RAE. The graphs were plotted with the se.
