Ultradian Growth Oscillations in Organs: Physiological Signal or Noise?

Baskin, Tobias I.

doi:10.1007/978-3-319-20517-5_1

Cited by 11 publications

(9 citation statements)

References 66 publications

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“…By tracking the maxima of these pulses over time, we observed that these oscillations in elongation growth rate and variation of curvature travelled from the apex to the base of the coleoptile. Other oscillations in different forms of plant growth have been described in the literature [25], but these reports are infrequent and the features of these oscillations are clearly different from what we have observed in the current study. indeed most of the growth oscillations reported in the literature so far occur during the nutation of the aerial organ, e.g.…”

Section: Discussioncontrasting

confidence: 96%

Gravitropic Movement in Wheat Coleoptile is Regulated by Ultradian Growth Oscillations

Bastien¹,

Guayasamin

Douady

et al. 2017

Preprint

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To stand straight and upright along their growth, plants needs to regulate actively their posture. Gravitropic movement, which occurs when plants modify their growth and curvature to orient their aerial organ against the force of gravity, is a major feature of this postural control. A recent model has shown that graviception and proprioception are sufficient to account for the gravitropic movement and subsequent organ posture demonstrated by a range of species. However, some plants, including wheat coleoptiles, exhibit a stronger regulation of posture than predicted by the model. Here, we performed an extensive kinematics study on wheat coleoptiles during a gravitropic perturbation experiment in order to better understand this unexpectedly strong regulation. Close temporal observation of the data revealed that both perturbed and unperturbed coleoptiles showed oscillatory pulses of elongation and curvature variation that propagated from the apex to the base of their aerial organs. In perturbed (tilted) coleoptiles, we discovered a non-trivial coupling between the oscillatory dynamics of curvature and elongation. This relationship appears to be critical to the postural control of the organ, and indicates the presence of a mechanism that is capable of affecting the relationship between elongation rate, differential growth, and curvature.

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Section: Discussioncontrasting

confidence: 96%

Gravitropic Movement in Wheat Coleoptile is Regulated by Ultradian Growth Oscillations

Bastien¹,

Guayasamin

Douady

et al. 2017

Preprint

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“…A 90 min period is similar to periods reported previously for various kinds of rhythmic growth phenomena, including organ growth rate (Baskin, 2015). These rhythms are sometimes called ultradian to contrast them from the longer and more commonly studied circadian rhythms.…”

Section: Variations On the Themesupporting

confidence: 81%

Positioning the Root Elongation Zone is Saltatory and Receives Input from the Shoot

et al. 2020

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In the root, meristem and elongation zone lengths remain stable, despite growth and division of cells. To gain insight into zone stability, we imaged individual Arabidopsis thaliana roots through a horizontal microscope and used image analysis to obtain velocity profiles. For a root, velocity profiles obtained every 5 min over 3 h coincided closely, implying that zonation is regulated tightly. However, the position of the elongation zone saltated, by on average 17 mm every 5 min. Saltation was apparently driven by material elements growing faster and then slower, while moving through the growth zone. When the shoot was excised, after about 90 min, growth zone dynamics resembled those of intact roots, except that the position of the elongation zone moved, on average, rootward, by several hundred microns in 24 h. We hypothesize that mechanisms determining elongation zone position receive input from the shoot.

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“…The variation of the principal direction of the differential growth ψ g (s, t) provides a natural way to implement an endogenous oscillator, since it is the only known growth driven process occurring parallel to the horizontal plane. To date there are no exact experimental observations of the temporal variation of ψ g (t), however the existence of a linear oscillator seems consistent with measurements made on opposite sides of an organ [19,31], where the differential growth oscillates periodically from one side to the other. Moreover, the model allows to extract ψ g (s, t) and ∆(ψ g (t), t)Ė(t)(s, t) from 3D experimental data of the curvature C(s, t) (and therefore also R and ψ c (s, t)).…”

Section: Measurements Of the Apical Tip In The Horizontal Planementioning

confidence: 59%

The Kinematics of Plant Nutation Reveals a Simple Relation between Curvature and the Orientation of Differential Growth

Bastien

Meroz

2016

PLoS Comput Biol

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Nutation is an oscillatory movement that plants display during their development. Despite its ubiquity among plants movements, the relation between the observed movement and the underlying biological mechanisms remains unclear. Here we show that the kinematics of the full organ in 3D give a simple picture of plant nutation, where the orientation of the curvature along the main axis of the organ aligns with the direction of maximal differential growth. Within this framework we reexamine the validity of widely used experimental measurements of the apical tip as markers of growth dynamics. We show that though this relation is correct under certain conditions, it does not generally hold, and is not sufficient to uncover the specific role of each mechanism. As an example we re-interpret previously measured experimental observations using our model.

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Ultradian Growth Oscillations in Organs: Physiological Signal or Noise?

Cited by 11 publications

References 66 publications

Gravitropic Movement in Wheat Coleoptile is Regulated by Ultradian Growth Oscillations

Gravitropic Movement in Wheat Coleoptile is Regulated by Ultradian Growth Oscillations

Positioning the Root Elongation Zone is Saltatory and Receives Input from the Shoot

The Kinematics of Plant Nutation Reveals a Simple Relation between Curvature and the Orientation of Differential Growth

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