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Potassium-efflux channels in extensor and flexor cells of the motor organ of Samanea saman are not identical. Effects of cytosolic calcium.

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Leaflet movements in the mimosa-family tree Samanea saman stem from coordinated volume changes of cells in the leaf motor organs in the adaxial and abaxial motor cells ("flexors" and "extensors"). Shrinking, initiated by dissimilar light signals in extensors and in flexors, depends in both cell

Potassium Channels in Motor Cells of Samanea saman: A Patch-Clamp Study.

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Leaflet movements in Samanea saman are driven by the shrinking and swelling of cells in opposing (extensor and flexor) regions of the motor organ (pulvinus). Changes in cell volume, in turn, depend upon large changes in motor cell content of K(+), Cl(-) and other ions. We performed patch-clamp

Potassium flux and leaf movement in Samanea saman. I. Rhythmic movement.

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Samanea leaflets usually open in white light and fold together when darkened, but also open and dose with a circadian rhythm during prolonged darkness. Leaflet movement results from differential changes in the turgor and shape of motor cells on opposite sides of the pulvinus; extensor cells expand

Potassium flux and leaf movement in Samanea saman. II. Phytochrome controlled movement.

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Phytochrome, a membrane-localized biliprotein whose conformation is shifted reversibly by brief red or far-red light treatments, interacts with the rhythmic oscillator to regulate leaflet movement and potassium flux in pulvinal motor cells of Samanea. Darkened pinnae exposed briefly to red light

Potassium-efflux channels in extensor and flexor cells of the motor organ of Samanea saman are not identical. Effects of cytosolic calcium.

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Diurnal and circadian regulation of putative potassium channels in a leaf moving organ.

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In a search for potassium channels involved in light- and clock-regulated leaf movements, 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

Potassium Channels in Samanea saman Protoplasts Controlled by Phytochrome and the Biological Clock.

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Leaflet movement in legumes depends on rhythmic, light-regulated ion fluxes in opposing regions of the leaf-moving organ. In flexor and extensor protoplasts from Samanea saman Merrill, opening and closing of K(+) channels were rhythmic in constant darkness. When channels were open in flexor

Extracellular protons inhibit the activity of inward-rectifying potassium channels in the motor cells of Samanea saman pulvini.

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The intermittent influx of K+ into motor cells in motor organs (pulvini) is essential to the rhythmic movement of leaves and leaflets in various plants, but in contrast to the K+ influx channels in guard cells, those in pulvinar motor cells have not yet been characterized. We analyzed these channels

Extensor and Flexor Protoplasts from Samanea Pulvini : II. X-Ray Analysis of Potassium, Chlorine, Sulfur, Phosphorus, and Calcium.

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Concentrations of K, Cl, P, S, and Ca in extensor and flexor protoplasts from open pulvini of the nyctinastic tree Samanea saman were estimated using x-ray microanalysis. This technique is particularly suitable when absolute numbers of protoplasts are low, because less than 100 protoplasts are

Blue light activates potassium-efflux channels in flexor cells from Samanea saman motor organs via two mechanisms.

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Light-induced leaflet movement of Samanea saman depends on the regulation of membrane transporters in motor cells. Blue light (BL) stimulates leaflet opening by inducing K(+) release from the flexor motor cells. To elucidate the mechanism of K(+)-efflux (K(D))-channel regulation by light, flexor

Phytochrome and Circadian Clocks in Samanea: Rhythmic Redistribution of Potassium and Chloride within the Pulvinus during Long Dark Periods.

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Previous investigations with the electron microprobe reveal that the movements of Samanea leaflets are correlated with massive redistribution of K within the pulvinus. Evidence is now presented that Cl moves with K, whether plants are in white light or darkness, whether or not the amplitude of free

Ion Channels Regulate Nyctinastic Leaf Opening in Samanea saman.

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The circadian leaf opening and closing (nyctinasty) of Fabaceae has attracted scientists' attention since the era of Charles Darwin. Nyctinastic movement is triggered by the alternate swelling and shrinking of motor cells at the base of the leaf. This, in turn, is facilitated by changing osmotic

Hybrid stereoisomers of a compact molecular probe based on a jasmonic acid glucoside: syntheses and biological evaluations.

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12-O-β-D-glucopyranosyl jasmonic acid (JAG) shows unique biological activities, including leaf-closing of Samanea saman. It is expected that the mode of action for such regulation is distinct from that of other jasmonates. We developed high-performance compact molecular probes (CMPs) based on JAG

12-hydroxyjasmonic acid glucoside is a COI1-JAZ-independent activator of leaf-closing movement in Samanea saman.

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Jasmonates are ubiquitously occurring plant growth regulators with high structural diversity that mediate numerous developmental processes and stress responses. We have recently identified 12-O-β-D-glucopyranosyljasmonic acid as the bioactive metabolite, leaf-closing factor (LCF), which induced

Light-promoted changes in apoplastic K(+) activity in the Samanea saman pulvinus, monitored with liquid membrane microelectrodes.

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The movement of Samanea saman (Jacq.) Merrill leaflets is a consequence of the re-distribution of K(+) and anions between motor cells on opposite sides of the pulvinus. We used a K(+)-sensitive microelectrode to study dynamic changes in K(+) transport through motor-cell membranes during and

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