The closing at night of <a data-tooltip = "" href = "https://www.futura-sciences.com/planete/definitions/botanique-petale-11194/" class = "tooltip-link" data-color = "light-green" data-title = "Petal" data-number = "" data-copy = "The petals correspond to all the parts making up the corolla of a flower. They are located above the sepals.
The petals are usually colored to attract pollinating organisms. Dicotyledonous plants in & nbsp; generally have & nbsp; 4 to 5. The … "data-image =" https://cdn.futura-sciences.com/buildsv6/images/midioriginal/e/7/0/e7085d4dc7_50037843_petale-annickashyam1- flickr.jpg "data-url =" https://www.futura-sciences.com/planete/definitions/botanique-petale-11194/ "data-more =" Read more ">petals of certain flowers is a protective mechanism for what they have most precious: their reproductive organs. So sheltered, stamens, pollen and pistils are better preserved from cold and humidity nocturne.
The night closing mechanism of flowers
The movement closing petals, but also leaves in some cash, is part of the so-called watch movements and sleep, or nyctinasty.
Controlled at the same time by the variation of light, by temperature and sometimes by an internal biological rhythm, the ion concentration calcium It2+ of cells changes. This change results in a change of osmotic pressure and therefore of turgidity cells. As this change is uneven between the underside and the upper side of the petal or leaf, it causes deformation which results in the closure of the plant organ.
In the morning, the stimuli antagonists reverse the process and the flower opens again.
To know everything about flowers, browse our complete file.
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