pulvinus


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pulvinus

[‚pəl′vī·nəs]
(botany)
A cushionlike enlargement of the base of a petiole which functions in turgor movements of leaves.

pulvinus

pulvinus, 1
1. The baluster at the side of an Ionic capital.
References in periodicals archive ?
1 mm long, caducous on the old branches, intense on the young branches, distributed on the pulvinus, margin with leaflets, sepals and legumes.
Leaves 1.55.5 cm long; pulvinus brown-greyish, pilose, c.
1.5 mm long, distributed on the branches, pulvinus, petioles, inflorescence axis, bracts, pedicels and young legumes.
Leaves 3.4-10.5 cm long; pulvinus dark green, glabrous, 1-1.5 mm diam.; petiole 12-30 mm long, c.
vulgaris pulvinus; similarly, abscisic acid decreased turgor for both regions [10].
They concluded that pulvinus responses to red and blue light differ not only by the tissue region but also by the time in the overall photoperiod.In general, it appears that unique signaling pathways in the two motor cell regions result in complementary cell responses for light or darkness.
In a previous study by our lab, ion transport proteins such as potassium channels and voltage-gated anion channels were not detected in the soybean pulvinus due to the difficulty of separating plasma membrane proteins using the trichloroacetic acid/acetone extraction methods.
Other enzymes implicated in pulvinar functions that were detected by our lab could also be regulated in a similar circadian fashion as the transport proteins.The objective of this study was to compare pulvinus protein levels expressed during the light to that in darkness to identify areas of differential expression.
Leaves 4-13 cm long; petiole 10-37 mm long; pulvinus 0.4-1.6 mm diam; rachis 0.6-1.4 cm long, extrafloral nectaries 1, ovoid, claviform and fusiform, sessile or shortly stipitate, located between the proximal pair of leaflets, 1.2-1.6 x 0.4-0.9 mm; leaflets 2 pairs, papyraceous, abaxial surface pubescent and adaxial surface puberulent, the distal 60-80 x 25-37 mm, the proximal 22-60 x 10-35 mm, ellipticoblanceolate, lanceolate-elliptic, obovate, ovate, venation brochidodromous, nervures 7-13 pairs, apex emarginate, short mucronate and obtuse, base cuneate, oblique, obtuse, subcordate, margin revolute, ciliated.
Leaves 3-11.5 cm long; petiole 9-25 mm long; pulvinus 0.4-1.2 mm diam; rachis 0.2-1.1 mm long, extrafloral nectaries 1, ovoid, claviform and fusiform, sessile or shortly stipitate, located between the proximal pair of leaflets, 10-28 x 0.2-0.4 mm; leaflets 2 pairs, papyraceous, abaxial surface pubescent and adaxial surface puberulent, the distal 23-80 x 8-40 mm, the proximal 12-60 x 5-34 mm, elliptic-oblanceolate, lanceolate-elliptic, obovate, ovate, venation brochidodromous, nervures 7-13 pairs, apex emarginate, short mucronate and obtuse, base cuneate, oblique, obtuse, subcordate, margin revolute, ciliated.
Leaves 2.9-5.8 cm long; petiole 13-30 mm long; pulvinus 0.6-1.1 mm diam; rachis 1-2 cm long, interfoliolar segments 0.3-1.2 cm long; extrafloral nectaries 1, fusiform, stipitate, located between the proximal pair of leaflets, 1.3-2 x 0.3-0.6 mm; leaflets 3 pairs, papyraceous, abaxial face strigose and adaxial face glabrous, the distal 21-41 x 10-21 mm, the proximal 9-26 x 5-18 mm, obovate, venation brochidodromous, nervures 7-9 pairs, apex rounded and mucronate, base cuneate and oblique, margin plane.
Leaves 0.8-22 cm long; petiole 25-42 mm long; pulvinus 1.7-2.3 mm diam; rachis 4-10.7 cm long, interfoliolar segments 0.7-2.6 cm long; extrafloral nectaries 1, ovoid, ellipsoid, sessile or short stipitate, located on the pulvinus, 1.2-2 x 1.2 1.5 mm; leaflets (3-)4-5 pairs, papyraceous, pubescent, venation brochidodromous, nervures 5-9 pairs, the proximal 10-37 x 7-24 mm, oval-elliptic, apex acuminate, base oblique-obtuse, margin plane, ciliated, the distal 26-75 x 13-30 mm, elliptic, apex acuminate, base oblique-obtuse, margin plane, ciliated.