Nyctinastic PlantInfo. Tropism is a term that refers to plant movement in response to a growth stimulus, like when sunflowers turn to face the sun. Nyctinasty is when plants close their leaves or petals at night and reopen them in the morning. This movement is controlled by changes in temperature or light. Nyctinasty is the circadian rhythmic nastic movement of leguminous plants in response to the onset of darkness, a unique and intriguing phenomenon that has attracted attention for centuries. In leguminous plants, nyctinasty is caused by volume change of cells in the pulvini, a special organ located at the base of the leaflet.— Nyctinasty is triggered within a plant in response to changes in external light, temperature, and humidity, and an internal circadian clock. Plants like the crocus close their flowers at night, a behavior known as nyctinasty.Plants that tuck themselves in for bedtime exhibit a natural behavior known as nyctinasty. In nyctinasty, some plants are able to assume a position at night that is different from their position during daytime. It is a biological rhythm since this behavior recurs in each circadian day. Nyctinasty encompasses several distinct types of circadian rhythmic movements in plants, primarily categorized by the affected plant parts and the direction or pattern of motion. Nyctinasty is a type of plant movement. Leaves fold up and lower by morning. Learn more about nyctinasty, why it happens, and the plants that experience this phenomenon. Nyctinasty is just one type of nastic movement in plants (reversible and repeatable movements in response to stimuli that is part of a plant’s make-up.) Plantnyctinasty – who will decode the ‘Rosetta Stone’. New Phytol.2019; 223 : 107-112. View in Article.How you can reuse Information Icon. Nyctinasty refers to how a plant's flowers or leaves open during the day and shut at night. Flora that fold themselves up at night, such as tulips, poppies and prayer plants... These plants are highly evolved. These tuck themselves for bedtime! As you know that Inse.Nyctinasty is the circadian response of higher plants to the onset of darkness.