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Welcome to the Pubget Medical Subject Headings (MESH) browser. Click on a topic or subtopic below to explore related papers. In the gold box is the most recent paper about the current MESH term, and below are 20 related papers.
Pulvinus (0):
Recent article
Pulvinus
Abstract
Pulvinus activity of Phaseolus species in response to environmental stimuli plays an essential role in heliotropic leaf movement. The aims of this study were to monitor the continuous daily pulvinus movement and pulvinus temperature, and to evaluate the effects of leaf movements, on a hot day, on in...
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PMID: 18751738
PDF is available here.
PDF is available here.
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Annals of Botany (101)2 2008
Abstract
The triggers that initiate and regulate the separation process are complex with, in bean leaves at least, the generation of a signal (or signals) from remote tissues, in concert with ethylene, a requisite part of the process. Once evoked, abscission cells maintain a developmental memory such that th...
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PMID: 17965027
PDF is available here.
PDF is available here.
Abstract
Previous studies on legume pulvini suggest that the vascular system plays an important role in the redistribution of ions and transmission of stimuli during leaf's movements. However, the number of anatomical and ultrastructural studies is limited to few species. The aim of this paper is to investig...
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PMID: 17950612
PDF is available here.
PDF is available here.
Physiologia Plantarum (131)1 2007
Abstract
We therefore investigated the possibility that this interaction might contribute to the gravitropic response of barley leaf sheath pulvini. Barley plants at the inflorescence stage were gravistimulated for varying times, and the pulvini were then separated into upper and lower halves for quantificat...
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PMID: 18251932
PDF is available here.
PDF is available here.
FEBS Letters (581)12 2007
Abstract
"Osmotic Motors"--the best-documented explanation for plant leaf movements--frequently reside in specialized motor leaf organs, pulvini. The movements result from dissimilar volume and turgor changes in two oppositely positioned parts of the pulvinus. This Osmotic Motor is powered by a plasma membra...
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PMID: 17434488
PDF is available here.
PDF is available here.
Protoplasma (229)1 2006
Abstract
We have analysed the incorporation of [(3)H]sucrose and [(3)H]mannitol in pulvinar motor cells of Robinia pseudoacacia L. during phytochrome-mediated nyctinastic closure. Pairs of leaflets, excised 2 h after the beginning of the photoperiod, were fed with 50 mM [(3)H]sucrose or [(3)H]mannitol, irrad...
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PMID: 17102931
PDF is available here.
PDF is available here.
Abstract
We compared the cell cytoskeleton by immunofluorescence analysis before and after movement, and the effects of actin- and microtubule-targeted drugs were examined by injecting them into the cut pulvinus. We found that fragmentation of actin filaments and microtubules occurs during bending, although...
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PMID: 16489209
PDF is available here.
PDF is available here.
Chemical Record (6)6 2006
Abstract
The chemical aspects of the circadian leaf movement known as "nyctinasty" are discussed in this paper. Each of the nyctinastic plants of five different genera so far examined contained a pair of factors, one of which induced leaf closure and another induced leaf opening. The relative contents of the...
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PMID: 17304541
PDF is available here.
PDF is available here.
Abstract
We monitored amyloplast movements in response to gravistimulation. In a pharmacological approach we investigated how the dynamics of plastid sedimentation are affected by actin and microtubule (MT) disrupting drugs. Dark grown caulonemal filaments of the moss Physcomitrella patens respond to gravity...
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PMID: 15015476
PDF is available here.
PDF is available here.
Abstract
These results show that blue light inhibits the activity of the plasma membrane H(+)-ATPase. Inactivation of the plasma membrane H(+)-ATPase supports the membrane depolarization induced by the blue light irradiation....
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PMID: 12198188
PDF is available here.
PDF is available here.
Plant Cell Online (14)3 2002
Abstract
Our results link SsAQP2 to the physiological function of rhythmic cell volume changes....
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PMID: 11910017
PDF is available here.
PDF is available here.
Plant Physiology (128)2 2002
Abstract
We investigated factors that control gravitropic responses in this system. In the graviresponding pulvinus, hexose sugars (D-Glc and D-Fru) accumulated asymmetrically across the pulvinus. This correlated well with an asymmetric increase in acid invertase activity across the pulvinus. Northern analys...
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PMID: 11842162
PDF is available here.
PDF is available here.
Plant Physiology (128)2 2002
Abstract
We cloned four putative K channel genes from the leaf-moving organs, pulvini, of the legume Samanea saman. The S. saman SPOCK1 is homologous to KCO1, an Arabidopsis two-pore-domain K channel, the S. saman SPORK1 is similar to SKOR and GORK, Arabidopsis outward-rectifying Shaker-like K channels, and...
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PMID: 11842166
PDF is available here.
PDF is available here.
Plant and Cell Physiology (42)12 2001
Abstract
Blue light was found to induce shrinkage of the protoplasts isolated from first-leaf lamina pulvini of 18-day-old Phaseolus vulgaris. The response was transient following pulse stimulation, while it was sustainable during continuous stimulation. No apparent difference was found between flexor and ex...
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PMID: 11773529
PDF is available here.
PDF is available here.
Plant Physiology (127)3 2001
Abstract
We analyzed these channels in the plasma membrane of pulvinar cell protoplasts of the nyctinastic legume Samanea saman using the patch-clamp technique. Inward, hyperpolarization-activated currents were separated into two types: time dependent and instantaneous. These were attributed, respectively, t...
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PMID: 11706209
PDF is available here.
PDF is available here.
Plant Physiology (127)3 2001
Abstract
Our results suggest that within 15 min of gravistimulation, the translation of the majority of transcripts associated with polyribosomes decreased, resembling a general stress response. Recruitment of calreticulin and calmodulin transcripts into polyribosomes occurred predominantly in the lower pulv...
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PMID: 11706198
PDF is available here.
PDF is available here.
Plant and Cell Physiology (42)11 2001
Abstract
Protoplasts isolated from the laminar pulvinus of Phaseolus vulgaris and bathed in a medium containing KCl as the major salt were found to swell in response to IAA and to shrink in response to ABA. The protoplasts of flexor cells and those of extensor cells responded similarly. The results indicate...
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PMID: 11726706
PDF is available here.
PDF is available here.
Plant Physiology (127)1 2001
Abstract
We previously found that cytoplasmic pH (pH(c)) is a mediator in early gravitropic signaling (A.C. Scott, N.S. Allen [1999] Plant Physiol 121: 1291-1298). The question arises whether pH(c) has a more general role in signaling gravity vector changes. Using confocal ratiometric imaging and the fluores...
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PMID: 11553740
PDF is available here.
PDF is available here.
Abstract
The intracellular localization of phytochrome in the pulvini of Robinia pseudoacacia L. was analyzed by immunogold electron microscopy after red (R; 15 min) and far-red (FR; 5 min) irradiation 2 h after the beginning of the photoperiod. Screening of the available antibodies by immunoblotting demonst...
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PMID: 11556789
PDF is available here.
PDF is available here.
Abstract
This study focuses on the characterization of protein phosphorylation in the gravitropic response in oat shoot pulvini through the use of inhibitors of this process, namely staurosporine, okadaic acid and sodium fluoride. These three inhibitors reduce gravitropic curvature and cause changes in the p...
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PMID: 11543570
PDF is available here.
PDF is available here.
Abstract
We observed a transient 5-fold increase in inositol 1,4,5-trisphosphate (IP3) within 10 s of gravistimulation in the lower half of the pulvinus, indicating that the positional change was sensed immediately. Over the first 30 min, rapid IP3 fluctuations were observed between the upper and lower halve...
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PMID: 10318971
PDF is available here.
PDF is available here.
Abstract
Characterization of gravitropic bending in the maize stem pulvinus, a tissue that functions specifically in gravity responses, demonstrates that the pulvinus is an ideal system for studying gravitropism. Gravistimulation during the second of three developmental phases of the pulvinus induces a gradi...
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PMID: 11541593
PDF is available here.
PDF is available here.
Plant Journal (12)4 1997
Abstract
A sulfotransferase (ST) which catalyzes the transfer of sulfate from 3'-phosphoadenosine 5'-phosphosulfate (PAPS) to gallic acid glucoside was characterized from microsomal preparations of Mimosa pudica. The product of the reaction was found to co-elute on HPLC with the periodic leaf movement factor...
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PMID: 9375396
PDF is available here.
PDF is available here.
Abstract
We previously showed that blue light appears to close open K+ channels in flexor protoplasts during the dark period (subjective night) (Kim et al., 1992, Plant Physiol 99; 1532-1539). In contrast, transfer to darkness apparently closes open K+ channels in extensor protoplasts during the light period...
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PMID: 11540725
PDF is available here.
PDF is available here.
Journal of Membrane Biology (146)2 1995
Abstract
Isolated protoplasts from pulvinar motor cells of Mimosa pudica were studied using conventional whole-cell patch clamp techniques. With internal solutions weakly buffered for Ca2+ (0.2 mM EGTA), a rundown of the outward delayed rectifier K+ current was induced by hyperpolarizing the holding potentia...
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PMID: 7473689
PDF is available here.
PDF is available here.
Plant Physiology (107)2 1995
Abstract
Segments can be cut from the peduncular-1 internode of oat (Avena sativa L.) shoots so as to contain the graviresponsive leaf-sheath pulvinus and gibberellin-sensitive internodal tissue. Incorporation of [14C]glucose was used to monitor cell wall synthesis in these two tissues as affected by gravist...
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PMID: 11536686
PDF is available here.
PDF is available here.
Journal of Plant Physiology (145)1/2 1995
Abstract
During the gravitropic response, auxin-sensitivity of the lower flanks of leaf-sheath pulvini of Avena sativa (oat) is at least 1000-fold higher than those of the upper flanks and non-gravistimulated pulvini. When the pulvini are treated with 1 mM Ca2+, a 10-fold increase in auxin-sensitivity of th...
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PMID: 11538414
PDF is available here.
PDF is available here.
Journal of Plant Physiology (142)2 1993
Abstract
We examined the effect of gravistimulation on invertase mRNA induction. Total RNA and poly (A)+RNA, isolated from oat pulvini, and two oligonucleotide primers, corresponding to two conserved amino-acid sequences (NDPNG and WECPD) found in invertase from other species, were used for the polymerase c...
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PMID: 11538877
PDF is available here.
PDF is available here.
Abstract
We also found that there is no difference in the activities of either glucan synthase I or glucan synthase II in top halves as compared with bottom halves of gravistimulated pulvini. We conclude that the graviresponse in oat stems is not driven by new cell wall synthesis but, rather, by changes in...
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PMID: 11537505
PDF is available here.
PDF is available here.
Abstract
We conclude that apoplastic calcium is unimportant in leaf-sheath pulvinus gravitropism. The observation that calcium ions and calcium channel blockers inhibit IAA-induced growth, but have no effect on gravistimulated pulvini, further supports previous observations that gravistimulation alters the...
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PMID: 11536939
PDF is available here.
PDF is available here.
Abstract
These results indicate that the active basipetal export of auxin is inhibited by gravistimulation of the oat pulvinus, while active lateral transport is induced. It is concluded that, while lateral transport of auxin occurs following gravistimulation, it is not necessary for a graviresponse. Other...
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PMID: 11538277
PDF is available here.
PDF is available here.
Plant Physiology (94)2 1990
Abstract
The graviresponse of the leaf-sheath pulvinus of oat (Avena sativa) involves an asymmetric growth response accompanied by several asymmetric processes, including degradation of starch and cell wall synthesis. To understand further the cellular and biochemical events associated with the gravirespons...
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PMID: 11537483
PDF is available here.
PDF is available here.
Abstract
We argue that this confusion has resulted from a classification of organ movements which has been based on functional rather than on mechanistic considerations. Mechanistic unity is to be expected on evolutionary grounds. This unity, however, may apply only to certain elements of the stimulus-respon...
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PMID: 11541035
PDF is available here.
PDF is available here.
Plant Physiology (91)2 1989
Abstract
We designated the uppermost point of the cross-section 0 degrees and the lowermost point 180 degrees. A gravity-induced increase in pulvinus thickness was observable within 40 degrees of the vertical in coumarin-treated pulvini. In upper halves of coumarin-treated gravistimulated pulvini, cells in...
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PMID: 11537463
PDF is available here.
PDF is available here.
American Journal of Botany (75)11 1988
Abstract
The development of the leaf-sheath pulvinus of oat (Avena sativa L. cv. Victory) was studied in terms of its competency to respond to gravistimulation. Stages of onset of competency, maximum competency and loss of competency were identified, using the length of the supertending internode as a devel...
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PMID: 11538847
PDF is available here.
PDF is available here.
Plant Physiology (86) 1988
Abstract
These results strongly support the view that starch statoliths do indeed serve as the gravisensors in cereal grass shoots....
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PMID: 11538229
PDF is available here.
PDF is available here.
Plant Physiology (87) 1988
Abstract
These results indicate that gravistimulation produces changes in pulvinus responsiveness to both IAA and GA3 and that the changes are unique for each growth regulator. It is suggested that the changes in responsiveness may result from processes at the cellular level other than changes in hormonal s...
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PMID: 11537872
PDF is available here.
PDF is available here.
Plant Physiology (88)1 1988
Abstract
These results indicate that starch-filled amyloplasts are required for the graviresponse of barley pulvini and suggest that they function in the stimulus perception and signal transduction components of gravitropism....
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PMID: 11537432
PDF is available here.
PDF is available here.
Abstract
We present a model for gravitropism in pulvini based on recent findings from studies on the mechanisms of graviperception and graviresponse. According to this model, amyloplasts play an essential role in perceiving a change in the orientation of the pulvinus. The perception of this reorientation l...
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PMID: 11539053
PDF is available here.
PDF is available here.
Abstract
We conclude that the burst in ethylene production that develops in leaf-sheath bases (pulvini) after they have started to curve upwards is not primary to the induction of curvature. We further suggest that ethylene has no major effect or role in the induction of upward bending after gravistimulatio...
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PMID: 11540850
PDF is available here.
PDF is available here.
Annals of Botany (53) 1984
Abstract
The negative gravitropic response in the grass leaf-sheath pulvinus is a consequence of cell elongation involving all cells except those of the uppermost region of the upper flank of an horizontally oriented pulvinus. The lowermost layer of cells elongate maximally, and the regions in between elong...
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PMID: 11539772
PDF is available here.
PDF is available here.