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.

Nastic leaf movement in plants requires the swelling and shrinking of motor cells in a specialized structure, called the pulvinus or motor organ, located at the base of the petiole [27].

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 …

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.

2024年4月23日 · In species that show rapid, reversible leaf movement, movement is mediated by turgor changes in specialized cells at the base of the petiole known as the pulvinus or other motor cells [55,56] . In species that lack a pulvinus, like Arabidopsis , movement is thought to be due to the differential enlargement of cells in the adaxial and abaxial ...

Leaf base (= hypo podium) is the lowermost part of the leaf by which the leaf is joined to the node of the stem. It protects the young axillary bud. Leaf base is often indistinguishable from the petiole. In many legumes it is swollen. The swollen leaf base is known as pulvinus. It is responsible for sleep and shock movements of certain leaves ...

In many ins­tances, as in the leguminous plants (e.g., the sensitive plant Mimosa pudica of Mimoseae or Dolichos of Papilionaceae) or in plants like mango , etc., the leaf-base has a swollen appearance forming a sort of a cushion and is called the pulvinus. Such a leaf can be easily plucked off and leaves a scar on the stem.

Pulvinus: In legumes leafbase become broad and swollen which is known as pulvinus. Example: Clitoria, Lablab, Cassia, Erythrina, Butea, Peltophorum. Sheathing leafbase: In many monocot families such as Arecaceae, Musaceae, Zingiberaceae and Poaceae the leafbase extends into a sheath and clasps part or whole of the internode.

2022年9月6日 · The leaf movement of legume species is actuated by a repetitive bending deformation of a pulvinus, a joint-like thickening at the base of a petiole, of a petiolule, or of a leaflet (Figure 1). The deformation of a pulvinus is driven …

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.