Circumnutation in <i>Phaseolus vulgaris</i>. I. Growth, osmotic potential and cell ultrastructure in the free‐moving part of the shoot

Millet, Bernard; Melin, Daniel

doi:10.1111/j.1399-3054.1988.tb06634.x

Cited by 38 publications

(26 citation statements)

References 4 publications

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“…A correlation has been shown to exist between endogenous, rhythmic ion pumps (and/ or ion fluxes) and circumnutations in roots and twining shoots (Millet et al, 1988;Shabala & Newman, 1997a). Osmotically driven water fluxes must ultimately be responsible for the bending and the rotational movements.…”

Section: Discussionmentioning

confidence: 99%

Gravity amplifies and microgravity decreases circumnutations in Arabidopsis thaliana stems: results from a space experiment

2009

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Summary• In a microgravity experiment onboard the International Space Station, circumnutations of Arabidopsis thaliana were studied. Plants were cultivated on rotors under a light:dark (LD) cycle of 16 : 8 h, and it was possible to apply controlled centrifugation pulses. Time-lapse images of inflorescence stems (primary, primary axillary and lateral inflorescences) documented the effect of microgravity on the circumnutations.• Self-sustained circumnutations of side stems were present in microgravity but amplitudes were mostly very small. In darkness, centrifugation at 0.8 g increased the amplitude by a factor of five to ten. The period at 0.8 g was c. 85 min, in microgravity roughly of the same magnitude. In white light the period decreased to c. 60 min at 0.8 g (microgravity value not measurable). Three-dimensional data showed that under 0.8 g side stems rotated in both clockwise and counter-clockwise directions.• Circumnutation data for the main stem in light showed a doubling of the amplitude and a longer period at 0.8 g than in microgravity (c. 80 vs 60 min).• For the first time, the importance of gravity in amplifying minute oscillatory movements in microgravity into high-amplitude circumnutations was unequivocally demonstrated. The importance of these findings for the modelling of gravity effects on self-sustained oscillatory movements is discussed.

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Section: Discussionmentioning

confidence: 99%

Gravity amplifies and microgravity decreases circumnutations in Arabidopsis thaliana stems: results from a space experiment

2009

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“…22 A wave of cell turgor changes proceeding along the bean shoot was observed. 11 Ion channels, which facilitate ion and water fluxes, are an important element in the circumnutation mechanism. Their participation is confirmed in experiments on ion channel blockers inducing changes in the amplitude and period.…”

Section: Models Of Circumnutation Mechanismmentioning

confidence: 99%

“…plication of the cell wall, the cells were to some extent flexible and could contract and expand. 11 Nowadays, while constructing a model of the circumnutation mechanism, one must take into account a number of physiological aspects, for instance, turgor changes, ion content fluctuations or the level of growth regulators. 22 A wave of cell turgor changes proceeding along the bean shoot was observed.…”

Section: Models Of Circumnutation Mechanismmentioning

confidence: 99%

Circumnutation as a visible plant action and reaction

Stolarz

2009

Plant Signaling & Behavior

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Circumnutation is a helical organ movement widespread among plants. It is variable due to a different magnitude of trajectory (amplitude) outlined by the organ tip, duration of one cycle (period), circular, elliptical, pendulum-like or irregular shape and clock-and counterclockwise direction of rotation. Some of those movement parameters are regulated by circadian clock and show daily and infradian rhythms. Circumnutation is influenced by light, temperature, chemicals and can depend on organ morphology. The diversity of this phenomenon is easier to see now that the digital time-lapse video method is developing fast. Whether circumnutation is an endogenous action, a reaction to exogenous stimuli or has a combined character has been discussed for a long time. Similarly, the relationship between growth and circumnutation is still unclear. In the mechanism of circumnutation, epidermal and endodermal cells as well as plasmodesmata, plasma membrane, ions (Ca 2+ , K + and Cl -), ion channels and the proton pump (H + ATPase) are engaged. Based on these data, the hypothetical electrophysiological model of the circumnutation mechanism has been proposed here. In the recent circumnutation studies, gravitropic, auxin, clock and phytochrome mutants are used and new functions of circumnutation in plants' life have been investigated and described.

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“…Continuous observation of the growth direction of each root would be required to clarify the relationship between these phenomena. In shoots of Phaseolus vulgaris, changes in the osmotic potential of the cell sap contribute to the circumnutations (Millet et al, 1988). However, such a result has not been confirmed in roots.…”

Section: Discussionmentioning

confidence: 72%

Automorphogenesis of maize roots under simulated microgravity conditions

Hoson

1994

Plant Soil

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Plant seedlings show exaggerated growth responses on a three-dimensional clinostat. Such an automorphogenesis appears to be one of major factors which govern the life cycle of higher plants under a microgravity environment. On the three-dimensional clinostat, maize roots exhibited curvatures in three different portions; 1) the basal region just protruding from the coleorhiza, 2) the region between the mature and the elongation zone, and 3) the elongation zone, several mm from the tip. Even non-clinostatted control roots showed some degree of curvature. The curvature occurred at random without any dorsiventrality. There was no difference in the osmotic concentration of the cell sap between the convex and the concave halves of any region. However, the convex, rapidly expanding side exhibited a higher extensibility of the cell wall in some regions, which appears to be a cause of the curvature. In order to understand the role of gravity in regulation of plant growth and development, we should clarify a series of events by which an automorphogenesis is induced under simulated microgravity conditions. Abbreviation: 3-D --three-dimensional

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Circumnutation in Phaseolus vulgaris. I. Growth, osmotic potential and cell ultrastructure in the free‐moving part of the shoot

Cited by 38 publications

References 4 publications

Gravity amplifies and microgravity decreases circumnutations in Arabidopsis thaliana stems: results from a space experiment

Gravity amplifies and microgravity decreases circumnutations in Arabidopsis thaliana stems: results from a space experiment

Circumnutation as a visible plant action and reaction

Automorphogenesis of maize roots under simulated microgravity conditions

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