Morphing Structures in the Venus Flytrap
Venus flytrap is a marvelous plant that intrigued scientists since times of Charles Darwin. This carnivorous plant is capable of very fast movements to catch insects. Mechanism of this movement was debated for a long time. Here, the most recent Hydroelastic Curvature Model is presented. In this model the upper leaf of the Venus flytrap is visualized as a thin, weakly curved elastic shell with principal natural curvatures that depend on the hydrostatic state of the two surface layers of cell, where different hydrostatic pressures are maintained. Unequal expansion of individual layers A and B results in bending of the leaf, and it was described in terms of bending elasticity. The external triggers, either mechanical or electrical, result in the opening of pores connecting these layers; water then rushes from the upper layer to the lower layer, and the bilayer couple quickly changes its curvature from convex to concave and the trap closes. Equations describing this movement were derived and verified with experimental data. The whole hunting cycle from catching the fly through tightening, through digestion, and through reopening the trap was described.
KeywordsMechanical Stimulation Sensory Memory Carnivorous Plant Spontaneous Curvature Venus Flytrap
This work was supported by the grant from the U.S. Army Research Office.
- De Candolle CP (1876) Sur la structure et les mouvements des feuilles du Dionaea muscipula. Arch Sci Phys Nat 55:400–431Google Scholar
- Drever JI (1997) The geochemistry of natural waters: surface and groundwater environments. Prentice Hall, Englewood CliffsGoogle Scholar
- Ksenzhek OS, Volkov AG (1998) Plant energetics. Academic Press, San DiegoGoogle Scholar
- Lloyd FE (1942) The carnivorous plants. Ronald, New YorkGoogle Scholar
- McGowan AMR, Washburn AE, Horta LG, Bryant RG, Cox DE, Siochi EJ, Padula SL, Holloway NM (2002) Recent results from NASA’s morphing project, smart structures and materials. In: Proceedings of SPIE—International Society for Optical Engineering (USA), San Diego, CA, vol 4698, doi: 10.1117/12.475056
- Munk H (1876) Die electrischen und Bewegungserscheinungen am Blatte der Dionaeae muscipula. Arch Anat Physiol Wiss Med pp 30–203Google Scholar
- Nelson DL, Cox MM (2005) Lehninger principles of biochemistry, 4th edn. Freeman, New York, pp 58–59Google Scholar
- Rea PA (1984) Evidence for the H+ -co-transport of D-alanine by the digestive glands of Dionaea muscipula Ellis. Plant, Cell Environ 7:363–366Google Scholar
- Volkov AG (ed) (2006a) Plant electrophysiology. Springer, BerlinGoogle Scholar
- Volkov AG (2006b) Electrophysiology and phototropism. In: Balushka F, Manusco S, Volkman D (eds) Communication in plants. Neuronal aspects of plant life. Springer, Berlin, pp 351–367Google Scholar
- Volkov AG, Deamer DW, Tanelian DL, Markin VS (1998) Liquid interfaces in chemistry and biology. Wiley, New YorkGoogle Scholar
- Williams ME, Mozingo HN (1971) The fine structure of the trigger hair in Venus’s flytrap. Amer J Botany 58:532–539Google Scholar