Super Soft Rayon Hawaiian Vintage Hibiscus Aloha Shirt
Nyctinasty is the circadian rhythmic nastic movement of plants in response to the onset of darkness, or a plant “sleeping”. Hibiscus, a nyctinastic plant, has a circadian cycle in which they open their leaflets during the day, and close them at night. The movement of the hibiscus flower is accomplished through changes in electrolyte concentrations that cause water movement and changes in turgor pressure throughout the plant.
An initial stimulus such as lack of light on photoreceptors triggers an electrical signal to be propagated along neighboring cells in the plant. This causes a change in turgor pressure of specific cells at the pulvinus to allow for bending of the petals upward. Upon the stimulus calcium-permeable anion channels open to allow a flux of calcium ions into the cytoplasm of the cell causing it to depolarize. This electrical signal is propagated down the phloem to neighboring cells as sequential voltage calcium channels open. In response to the change in membrane potential voltage, gated potassium and chlorine channels open causing an efflux of ions. Super Soft Rayon Hawaiian Vintage Hibiscus Aloha Shirt. The increased concentration of ions outside of the cell creates an electrochemical gradient that pulls water out of the cell through osmosis. Aquaporins and hydrogen ion ATPase also help with the movement of water molecules. This causes a change in turgor pressure as water flows out of the flexor cells on the pulvinus and into the extensor cells to allow for bending of petals up to close the flower. The mechanism for hibiscus nyctinasty is an example of plant movement to improve fitness.
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