noun (plural pulvini /-ˌnī/ /-nē/)Botany
An enlarged section at the base of a leaf stalk in some plants that is subject to changes of turgor, leading to movements of the leaf or leaflet.
- Leaves move by means of turgor pressure changes at the pulvinus at the base of each lamina.
- Soluble proteins were extracted from gravistimulated pulvini and subjected to protein phosphorylation reactions.
- The ion flux occurs within seconds after gravistimulation and establishes pH gradients across roots and maize pulvini.
Mid 19th century: from Latin, literally 'cushion'.
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