scholarly journals Potassium Channels in Motor Cells of Samanea saman

1988 ◽  
Vol 88 (3) ◽  
pp. 643-648 ◽  
Author(s):  
Nava Moran ◽  
Gerald Ehrenstein ◽  
Kunihiko Iwasa ◽  
Charles Mischke ◽  
Charles Bare ◽  
...  
Keyword(s):  
Potassium Channels ◽  
Motor Cells ◽  
Samanea Saman

scholarly journals Plasma Membrane Aquaporins in the Motor Cells of Samanea saman

2002 ◽  
Vol 14 (3) ◽  
pp. 727-739 ◽  
Author(s):  
Menachem Moshelion ◽  
Dirk Becker ◽  
Alexander Biela ◽  
Norbert Uehlein ◽  
Rainer Hedrich ◽  
...  
Keyword(s):  
Plasma Membrane ◽  
Motor Cells ◽  
Samanea Saman

scholarly journals Potassium Flux and Leaf Movement in Samanea saman

1974 ◽  
Vol 64 (4) ◽  
pp. 413-430 ◽  
Author(s):  
R. L. Satter ◽  
G. T. Geballe ◽  
P. B. Applewhite ◽  
A. W. Galston
Keyword(s):  
Circadian Rhythm ◽  
White Light ◽  
Electron Microprobe ◽  
Leaf Movement ◽  
Ion Pumps ◽  
Potassium Flux ◽  
Through Diffusion ◽  
Motor Cells ◽  
Samanea Saman

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 during opening and shrink during closure, while flexor cells shrink during opening and expand during closure but change shape more than size. Potassium in both open and closed pulvini is about 0.4 N. Flame photometric and electron microprobe analyses reveal that rhythmic and light-regulated postassium flux is the basis for pulvinar turgor movements. Rhythmic potassium flux during darkness in motor cells in the extensor region involves alternating predominance of inwardly directed ion pumps and leakage outward through diffusion channels, each lasting ca 12 h. White light affects the system by activating outwardly directed K+ pumps in motor cells in the flexor region.

scholarly journals Potassium Flux and Leaf Movement in Samanea saman

1974 ◽  
Vol 64 (4) ◽  
pp. 431-442 ◽  
Author(s):  
R. L. Satter ◽  
G. T. Geballe ◽  
A. W. Galston
Keyword(s):  
Differential Effect ◽  
Red Light ◽  
Leaf Movement ◽  
Phytochrome A ◽  
Level Increase ◽  
Potassium Flux ◽  
Motor Cells ◽  
Samanea Saman ◽  
Increasing Temperature

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 (high Pfr level) have less potassium in motor cells in the extensor region, more potassium in motor cells in the flexor region, and smaller angles than those exposed to far-red light (low Pfr level). Increase in temperature from 24° to 37° increases the differential effect of the light treatments during opening (the energetic phase) but not during closure, implying that phytochrome controls an energetic process. It seems likely that phytochrome interacts with rhythmically controlled potassium pumps in flexor and extensor cells. During nyctinastic closure of white-illuminated pinnae, exposure to far-red light before darkening results in larger angles than does exposure to red. As in rhythmic opening, the angles of all pinnae and the differential effect of the light treatments increases with increasing temperature.

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

Science ◽  
1993 ◽  
Vol 260 (5110) ◽  
pp. 960-962 ◽  
Author(s):  
H. Y. Kim ◽  
G. G. Cote ◽  
R. C. Crain
Keyword(s):  
Potassium Channels ◽  
Biological Clock ◽  
Samanea Saman
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