Supplementary information

From the following article:

How the Venus flytrap snaps

Yoël Forterre, Jan M. Skotheim, Jacques Dumais and L. Mahadevan

Nature 433, 421-425(27 January 2005)

doi:10.1038/nature03185

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Supplementary Video

Kinematic measurements of snapping were carried out on videos filmed at 400 frames s-1. Here we show a representative video of leaf closure filmed at the slightly lower speed of 125 frames s-1 and played back at 30 frames s-1.

Supplementary Methods

This section includes (a) details of the strain-field measurement technique, (b) experiments and results regarding the response of the leaf tissue to impulsive and step loads, (c) details of our poroelastic model for the dynamics of leaf closure, and (d) a summary of our notation.

Supplementary Figure 1

This figure presents typical measurements of the local strain field associated with leaf closure, determined using the replica technique.

Supplementary Figure 2

This figure shows the response of a strip of the closed leaf to impulse and step loads. The results are consistent with the simple estimate of the inertial and relaxation times in the main text of the paper.

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