A pulvinus (pl. pulvini) may refer to a joint-like thickening at the base of a plant leaf or leaflet that facilitates growth-independent movement. Pulvinus is also a botanical term for the persistent peg-like bases of the leaves in the coniferous genera Picea [1] and Tsuga.

The pulvinus is a swelling at the bases of the stalks of leaves and leaflets functioning as a leaf-moving organ. You might find these chapters and articles relevant to this topic. Michael G. Simpson, in Plant Systematics (Third Edition), 2019.

Pulvinus is a swollen leaf base composed of tissues that conduct water surrounded by a layer of motor cells. The motor cells can swell or shrink depending on whether the water moves in or out of the cell causing the movement of leaves.

The meaning of PULVINUS is a swelling at the base of a petiole or petiolule.

Hint: A pulvinus is a joint-like thickening situated at the base of a plant leaf or a leaflet that facilitates growth-independent nyctinastic and thigmonastic movement. Pulvini can be present at the base or apex of the petiole or even where the leaflets of a …

2024年4月23日 · Leaf movement is usually driven by a specialized motor organ, the pulvinus, and this movement is associated with different changes in volume and expansion on the two sides of the pulvinus.

a mass of thin-walled cells at the base of the leaf petiole in certain plants, forming a swollen area surrounding the vascular tissue. The pulvinus is subject to large changes in TURGOR. For example, in the runner bean the pulvinus is turgid during the day and supports the petiole, so that the leaf is held outwards.

A prominent swelling at the base of a petiole or pinna. It consists of cells (motor cells) that can rapidly move water into or out of their vacuoles. Such changes in turgor alter the position of the leaf or leaflet and are responsible for certain sleep movements and haptotropic movements. Pulvini are found in many members of the Leguminosae. 2.

Leaf movements of many plant species are mediated by curvatures of pulvini, located at the base of petioles and laminae. In pulvini, the central vascular core is surrounded by parenchymous cortex cells.

2018年5月17日 · pulvinus A group of cells at the base of a leaf or leaflet in certain plants that, by rapidly losing water, brings about changes in the position of the leaves. In the sensitive plant (Mimosa pudica), the pulvinus is responsible for the folding of the leaves that occurs at nightfall or when the plant is touched or injured.