Figure 2.

Leaf Movements of a Representative Species.

(A) Sleep movements of Phaseolus coccineus. The position of the primary leaves of a seedling at night is at the left and during the day is at the right.

(B) Circadian rhythm of leaf movements of P. coccineus entrained to light/dark cycles and monitored in continuous light. As can be inferred from the leaf positions in (A), the peaks of the curve represent the nighttime leaf position. The vertical lines indicate 24-h intervals. The period for this trace is ∼27 h.

(A) was originally published as Figure 14 and (B) as Figure 4 in Chapter 2 in Bünning (1973). Both are reproduced with kind permission of Springer Science and Business Media.