Die Auslösung endogen-tagesperiodischer Vorgänge bei Pflanzen durch einmalige Reize

Wassermann, Ludwig

doi:10.1007/bf01937853

Cited by 22 publications

(10 citation statements)

References 11 publications

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“…He believed that seedling leaves in constant light would express their 'endogenous' rhythm only after experiencing a short period of darkness, the relevant experiments with Ph. coccineus having been performed by Wassermann (1959) who showed that a dark period of about 9 h was necessary for rhythm establishment. However, it may be that Canavalia and Phaseolus differ in their light requirement for rhythm establishment.…”

Section: Restoration Of Leaf Movement Rhythms After a Period Of Stasismentioning

confidence: 99%

Leaf movements and their relationship with the lunisolar gravitational force

Barlow

2015

Ann Bot

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Correlation between leaftide and Etide time courses holds for leaf movement rhythms in natural conditions of the greenhouse, in conditions of constant light or dark, under microgravity conditions of the International Space Station, and also holds for rhythms that are atypical, such as pendulum and relaxation rhythms whose periods are longer or shorter than usual. Even the apparently spontaneous short-period, small-amplitude rhythms recorded from leaves under unusual growth conditions are consistent with the hypothesis of a lunisolar zeitgeber. Two hypotheses that could account for the synchronism between leaftide and Etide, and which are based on either quantum considerations or on classical Newtonian physics, are presented and discussed.

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Section: Restoration Of Leaf Movement Rhythms After a Period Of Stasismentioning

confidence: 99%

Leaf movements and their relationship with the lunisolar gravitational force

Barlow

2015

Ann Bot

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“…She found that both individual cells and populations of cells show a circadian rhythm if placed in constant dim light (50 footcandles) after a previous LD cycle; however, the rhythm is lost in both individual cells and populations of cells if they are placed in constant bright light (800 footcandles) after a previous LD cycle. Wasserman (1959) showed that the circadian rhythm of leaf movement in the plant Phaseolits is accompanied by a parallel circadian rhythm in nuclear volume of epidermal cells ; if plants are placed in constant bright light after an LD cycle, both rhythmicities cease. Thus, in these two cases, secondary arhythmicity may be attributed to an arhythmicity of constituent parts.…”

Section: Discussionmentioning

confidence: 99%

“…As several authors have noted (Pittendrigh and Bruce, 1957;Wasserman, 1959;Sweeney and Hastings, 1960) (Pittendrigh, 1954;Wilkins, 1965). The question may be restated in terms of this phenomenon: "Is the induction of circadian rhythmicity in primary arhythmic populations due to initiation of circadian oscillations inherited at rest, or to synchronisation of circadian oscillations inherited in motion but out of phase?"…”

mentioning

confidence: 89%

ON THE ABSENCE OF CIRCADIAN RHYTHMICITY INDROSOPHILA PSEUDOOBSCURAPUPAE

Zimmerman

1969

The Biological Bulletin

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Circadian rhythms are the rule rather than the exception in eucaryotic organisms ; from unicellular organisms to higher plants and animals a diversity of physiological functions has been shown to exhibit approximately 24 hour intervals between maxima. In spite of this physiological and systematic ubiquity, the circadian oscillations underlying circadian rhythms are remarkably uniform in their formal properties : they persist in constant dark and different constant temperatures with a period, i, which is close to 24 hours, and they can be reset, and entrained by light and temperature signals (for reviews,

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“…dark period (B). After Wassermann [40]. There are other indications that we are dealing here with relaxation oscillations.…”

Section: Daysmentioning

confidence: 90%