Natures wonders: venus flytrap mechanism (Introduction)

by David Turell , Tuesday, June 23, 2020, 20:49 (1612 days ago) @ David Turell

New studies, but still no complete answers:

https://phys.org/news/2020-06-biomechanical-analyses-simulations-reveal-venus.html

"The Venus flytrap (Dionaea muscipula) takes only 100 milliseconds to trap its prey. Once their leaves, which have been transformed into snap traps, have closed, insects can no longer escape. Using biomechanical experiments and virtual Venus flytraps a team from Freiburg Botanical Garden and the University of Stuttgart has analyzed in detail how the lobes of the trap move. Freiburg biologists Dr. Anna Westermeier, Max Mylo, Prof. Dr. Thomas Speck and Dr. Simon Poppinga and Stuttgart structural engineer Renate Sachse and Prof. Dr. Manfred Bischoff show that the trap of the carnivorous plant is under mechanical prestress. In addition, its three tissue layers of each lobe have to deform according to a special pattern.

"The diet of the Venus flytrap consists mainly of crawling insects. When the animals touch the sensory hairs inside the trap twice within about 20 seconds it snaps shut. Aspects such as how the trap perceives its prey and how it differentiates potential prey from a raindrop falling into the trap were already well known to scientists. However the precise morphing process of the halves of the trap remained largely unknown.

"In order to gain a better understanding of these processes, the researchers have analyzed the interior and exterior surfaces of the trap using digital 3-D image correlation methods. Scientists typically use these methods for the examination of technical materials. Using the results the team then constructed several virtual traps in a finite element simulation that differ in their tissue layer setups and in the mechanical behavior of the layers.

"Only the digital traps that were under prestress displayed the typical snapping. The team confirmed this observation with dehydration tests on real plants: only well-watered traps are able to snap shut quickly and correctly by releasing this prestress. Watering the plant changed the pressure in the cells and with it the behavior of the tissue. In order to close correctly, the traps also had to consist of three layers of tissue: an inner which constricts, an outer which expands, and a neutral middle layer."

Comment: These strange plants raise questions. How did they evolve? How could there be an intermediate stage? We know of none. How did the plant develop digestive chemicals and self- protection at the same time?