scholarly journals The Circadian Rhythm of Leaf Movement of Coleus blumei x C. frederici, a Short Day Plant. II. The Effects of Light and Temperature Signals

1968 ◽  
Vol 43 (12) ◽  
pp. 1887-1893 ◽  
Author(s):  
Ruth Halaban
Keyword(s):  
Circadian Rhythm ◽  
Leaf Movement ◽  
Short Day ◽  
Coleus Blumei

Phase Shifting Effect of Caffeine in the Circadian Rhythm of Phaseolus coccineus L

1975 ◽  
Vol 30 (11-12) ◽  
pp. 855-856 ◽  
Author(s):  
W. Mayer ◽  
I. Scherer
Keyword(s):  
Circadian Rhythm ◽  
Phaseolus Coccineus ◽  
Phase Shifting ◽  
Leaf Movement ◽  
Circadian Leaf Movement

Abstract Caffeine, Circadian Rhythm, Sleep and Wakefulness, Phaseolus coccineus L. 4-hour caffeine pulses (10 mᴍ) offered via the trans­ piration stream advances or delays the phase of the circadian leaf movement rhythm of Phaseolus coccineus as a function of the phase of application. It is hypothesized that the caffeine effect upon sleep and wakefulness in man is partly due to this phase-shifting effect.

Leaf Movement Rhythm In Arabidopsis Thaliana

1992 ◽  
Vol 47 (11-12) ◽  
pp. 925-928 ◽  
Author(s):  
Wolfgang Engelmann ◽  
Karl Simon ◽  
Chen Jyh Phen
Keyword(s):  
Arabidopsis Thaliana ◽  
Circadian Rhythm ◽  
Computer System ◽  
Leaf Movement ◽  
Leaf Movements ◽  
Weak Light

A circadian rhythm of leaf movements of Arabidopsis thaliana and its recording in continuous weak light with a video-computer system is described

scholarly journals Quantification of leaf movement to study the circadian rhythm using the optical flow

2020 ◽  
Vol 542 ◽  
pp. 012066
Author(s):  
A P Nugroho ◽  
S Maghfiroh ◽  
D Fatmawati ◽  
G P Edwantiar ◽  
L Sutiarso ◽  
...  
Keyword(s):  
Circadian Rhythm ◽  
Optical Flow ◽  
Leaf Movement

„Second messenger″ höherer Pflanzen / Second Messenger of Higher Plants

1985 ◽  
Vol 40 (11) ◽  
pp. 1566-1569
Author(s):  
Hermann Schildknecht ◽  
Martin Hein ◽  
Wolfgang Bender
Keyword(s):  
Circadian Rhythm ◽  
Higher Plants ◽  
Second Messenger ◽  
Leaf Movement ◽  
Mimosa Pudica ◽  
Naturally Occurring

Cyclic mononucleotides − 2′,3′ cAMP and 2′,3′ cGMP − were found in several higher plants. They seem to be widespread, naturally occurring compounds. 2′ AMP, 3′ AMP, 2′ GMP and 3′ GMP, which were also isolated from several plants, are possibly artifacts of the cyclic nucleo­tides. In small amounts ApA was isolated from Abutilon grandiflorum, UpA and UpG from Mimosa pudica L.The biological influence of 2′,3′ cAMP and 2′,3′ cGMP on the nyctinastic leaf movement was tested. There is some evidence that both substances shift and dampen the circadian rhythm of Albizia lophanta.

Semidian rhythmicity in the flowering response of Pharbitis nil to changes in temperature

1998 ◽  
Vol 25 (2) ◽  
pp. 183 ◽  
Author(s):  
O.M. Heide ◽  
R.W. King ◽  
L.T Evans
Keyword(s):  
Circadian Rhythm ◽  
Constant Temperature ◽  
Opposite Effect ◽  
Dark Period ◽  
Floral Induction ◽  
Continuous Light ◽  
The Other ◽  
Pharbitis Nil ◽  
Flowering Response ◽  
Short Day

Our earlier experiments on flowering in the short day plant Pharbitis nil involved far- red/dark (FR/D) interruptions of 90 min duration at various times during a continuous light, constant temperature period before a single inductive dark period. They revealed a rhythm with a period of 12 h, hence semidian. We concluded that the phasing of this semidian rhythm determined the length of darkness required for floral induction. This conclusion has since been challenged so we sought other pretreatments which reveal the semidian rhythm. Interruptions at 12°C–17°C for 45–90 min at various times prior to the inductive dark period were as effective as FR/D in eliciting the semidian rhythm, with significant effects on flowering persisting for at least three cycles in constant conditions in continuous light. The rhythmic response to 12°C pretreatments was 3 h out of phase with that to FR/D pretreatments. Flowering responses to the semidian rhythm exposed by 12°C pretreatments were additive to and independent of those to a circadian rhythm. Some evidence was obtained of reversal of the inhibition or promotion of flowering by FR/D or 12°C by exposure immediately afterwards to the other pretreatment at times of their opposite effect. Pretreatments at 12°C, like those with FR/D, either reduced (if promotive) or extended (if inhibitory) the length of the dark period required for floral induction in this short day plant.

scholarly journals A Circadian Rhythm Set by Dusk Determines the Expression of FT Homologs and the Short-Day Photoperiodic Flowering Response in Pharbitis

2007 ◽  
Vol 19 (10) ◽  
pp. 2988-3000 ◽  
Author(s):  
Ryosuke Hayama ◽  
Bhavna Agashe ◽  
Elisabeth Luley ◽  
Rod King ◽  
George Coupland
Keyword(s):  
Circadian Rhythm ◽  
Flowering Response ◽  
Short Day ◽  
Photoperiodic Flowering

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.

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