Rapid plant movement mimosa pudica
Plants that are able to rapidly move their leaves or their leaflets in response to mechanical stimulation such as touch : Rapid plant movement mimosa pudica
Rapid plant movement mimosa pudica
In 1880 Charles Darwin published The Power of Movement in Plants , his second-to-last work before his death. Rapid plant movement encompasses movement in plant structures occurring over a very short period, usually under one second. For example, the Venus flytrap closes its trap in about 100 milliseconds . The dogwood bunchberry 's flower opens its petals and fires pollen in less than 0.5 milliseconds. The record is currently held by the white mulberry tree, with flower movement taking 25 microseconds, as pollen is catapulted from the stamens at velocities in excess of half the speed of sound —near the theoretical physical limits for movements in plants.
A variety of mechanisms are employed by plants in order to achieve these fast movements. Extremely fast movements such as the explosive spore dispersal techniques of Sphagnum mosses may involve increasing internal pressure via dehydration, causing a sudden propulsion of spores up or through the rapid opening of the "flower" opening triggered by insect pollination. mimosa pudica Fast movement can also be demonstrated in predatory plants, where the mechanical stimulation of insect movement creates an electrical action potential and a release of elastic energy within the plant tissues. This release can be seen in the closing of a Venus flytrap, the curling of sundew leaves, and in the trapdoor action and suction of bladderworts . Slower movement, such as the folding of Mimosa pudica leaves, may depend on reversible, but drastic or uneven changes in water pressure in the plant tissues This process is controlled by the fluctuation of ions in and out of the cell, and the osmotic response of water to the ion flux. Plants that move their leaves or leaflets at speeds rapid enough to be perceivable with the naked eye: These rapid plant movements differ from the more common, but much slower "growth-movements" of plants, called tropisms . Tropisms encompass movements that lead to physical, patisserie mimosa temara