• Using nuclear magnetic resonance, upward movement of water within the pulvinus joint in response to electrical stimulation was observed in the pulvinus at the base of the petiole (=the leaf stalk). (wikipedia.org)
  • A petiole is nearly always present, often with a pulvinus at its base. (wikipedia.org)
  • pulvinus always present at the base of each leaflet, and usually present at base of petiole. (co.zw)
  • Parts of each species (seed, stem, root, leaf, pulvinus and petiole) were sectioned after fixation and wax embedding with a LEITZ 1512 rotary microtome at 20 to 24 μm thickness and observed with a LEITZ DIAPLAN photomicroscope. (scialert.net)
  • 381 Pulvini may be present at the base of the leaf stalk or on its other end (apex), where the leaf is attached, or in a compound leaf at the place where the leaflets are joined to its middle stem. (wikipedia.org)
  • Movement of water to the upper or lower part of the pulvinus causes asymmetric swelling, therefore causing the stalk to either droop or rise. (wikipedia.org)
  • The upper (slow elongation) and lower (fast elongation) halves of six pulvini were harvested per time point. (nih.gov)
  • Pulvini from the control plants were separated into left and right halves (simulating upper and lower harvesting of pulvini in the gravity stimulated plants). (nih.gov)
  • Mechanical stimulation via touch is perceived and is translated to electrical stimulation causing the flow of ions out of the pulvinus cells. (wikipedia.org)
  • This motion is performed by motor cells in the pulvinus, a flexible segment of the stem just below the bud. (rarexoticseeds.com)
  • A pulvinus (pl. pulvini) is a joint-like thickening at the base of a plant leaf or leaflet that facilitates growth-independent movement. (wikipedia.org)
  • A pulvinus is located at the base of each leaflet of the plant. (wikipedia.org)
  • This is followed by an efflux of water, resulting in a sudden change of turgor pressure in the cells of the pulvinus. (wikipedia.org)
  • This is followed by an efflux of water, resulting in a sudden change of turgor pressure in the cells of the pulvinus. (wikipedia.org)
  • Aquaporins on the vacuole membrane of pulvini allow for the efflux of water that contributes to the change in turgor pressure. (wikipedia.org)
  • The cells that make up the pulvinus swell and shrink due to turgor pressure in accordance to the circadian clock and create the visible movement in the leaves (Zhou C, Han L, Fu C, etc. 2012). (root-houseplants.com)
  • The reversible movements involve osmotic motors in the pulvinus organ 3 , but rhythmic leaf movements can also be growth associated and thus non-reversible. (nature.com)
  • primary branches 3-6 cm, appressed to divaricate, varying sometimes within a panicle, stiff to flexible, bases appressed or abruptly spreading, usually without axillary pulvini. (swbiodiversity.org)
  • The swollen leaf bases (pulvini) are densely pubescence and the buds are somewhat angular. (nybg.org)
  • Pulvini are common, for example, in members of the bean family Fabaceae (Leguminosae): 185 and the prayer plant family Marantaceae. (wikipedia.org)
  • The complex in our region can be distinguished from other species by the following characteristics: perennial bunchgrass with rolled, thread-like and often curved blades, a ligule with conspicuous hairs, panicles for the most part condensed or contracted and without axillary pulvini (small appendages in the branch axils that force branches open) and purple awns 2-5 cm or even longer, which are equal to almost equal. (swbiodiversity.org)
  • As the sun moves across the sky, different amounts of water flow into different parts of the pulvinus, nudging the leaf in the sunniest direction. (time.com)
  • In spite of that fact the number of vessels containing intimal musculature, muscularelastic sphincters and polypoid pulvini in the arterial bed flow increases and in the major outflowing veins, on the contrary, thinning of their muscular tori takes place. (scirp.org)
  • The irreversibility of this process is probably due to deposition of new cell wall material and decreased wall extensibility, but tissue expansion likely results from mechanisms in common with those in pulvinus tissue 6 . (nature.com)