Rhythmic Differences in the Basipetal Movement of Indoleacetic Acid between Separated Upper and Lower Halves of Geotropically Stimulated Corn Coleoptiles

Shen-Miller, J.

doi:10.1104/pp.52.2.166

Cited by 15 publications

(8 citation statements)

References 28 publications

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“…A potential candidate to explain the REGR pulses that were observed in both groups of coleoptiles is auxin, as well-known and major growth factor in plants. The average velocity of propagation of auxin in coleoptiles (12mm.h −1 according to [29,30] is compatible with our own measurements (vp = 11.3 ± 6.0mm.h −1 for straight coleoptiles and vp = 12.3 ± 6.6mm.h −1 for tilted coleoptiles ). However, the average period of time between two pulses in our data set (tp = 2.2h) is four for five times longer than the pulses of auxin that have been previously recorded in coleoptiles [31][32][33].…”

Section: Discussionsupporting

confidence: 90%

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: Discussionsupporting

confidence: 90%

Gravitropic Movement in Wheat Coleoptile is Regulated by Ultradian Growth Oscillations

Bastien¹,

Guayasamin

Douady

et al. 2017

Preprint

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“…Rhythmic auxin transport has been reported in coleoptiles (14) and lateral gradients of auxin associated with hook opening in bean hypocotyls have also been described (12). The 'bobbing' movement of Pisum hooks indicates that the formation of this organ can be modulated in rhythmic fashion (7).…”

Section: Resultsmentioning

confidence: 98%

Physiology of Movements in Stems of Seedling Pisum sativum L. cv Alaska

Britz

Galston²

1982

Plant Physiol.

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The relationship between the apical hook and stem nutation in The extension growth of cylindrical plant organs is often accompanied by oscillatory bending movements (nutations) with periods on the order of 1 to several h. A complete understanding of growth regulation in plants will require the elucidation of these rhythms. In an earlier study (5), we concluded that simple gravitropic overshoots (e.g. Ref. 10) were unlikely to cause nutation in the third internode of peas. However, the nutational patterns were consistent with internal events such as endogenous rhythms of growth as the cause of oscillatory bending. Further work on the physiology of nutation should attempt to identify and to localize the rhythmic process(es), if such exist, and to explain the coupling between the primary oscillator (or clock) and subsequent growth.Several observations seem to connect nutations in pea stems with the apical hook. In the first place, differential cell elongation on opposite sides of the stem is responsible not only for nutation, but also for the formation and maintenance of the hook. Both processes seem to be autonomous. Second, the patterns ofnutation and hook curvature have a common plane of symmetry (5). Third, photomorphogenetically active light stimulates both hook opening and nutation (5, 7). Finally, formation of the hook has an irregularly rhythmic component which indicates oscillations in growth

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“…Along with many examples of intelligence so defined, he described (Trewavas, 2003) various plant capabilities that make such intelligence possible, including plant learning abilities (e.g., Shen-Miller, 1973; Ishikawa et al, 1991) and communication and decision-making capabilities (Addicott, 1982; Griffiths and McIntyre, 1993; Takayama and Sakagami, 2002). …”

Section: Introductionmentioning

confidence: 99%

Epigenetic Memory as a Basis for Intelligent Behavior in Clonal Plants

2016

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Environmentally induced epigenetic change enables plants to remember past environmental interactions. If this memory capability is exploited to prepare plants for future challenges, it can provide a basis for highly sophisticated behavior, considered intelligent by some. Against the backdrop of an overview of plant intelligence, we hypothesize: (1) that the capability of plants to engage in such intelligent behavior increases with the additional level of complexity afforded by clonality, and; (2) that more faithful inheritance of epigenetic information in clonal plants, in conjunction with information exchange and coordination between connected ramets, is likely to enable especially advanced intelligent behavior in this group. We therefore further hypothesize that this behavior provides ecological and evolutionary advantages to clonal plants, possibly explaining, at least in part, their widespread success. Finally, we suggest avenues of inquiry to enable assessing intelligent behavior and the role of epigenetic memory in clonal species.

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Rhythmic Differences in the Basipetal Movement of Indoleacetic Acid between Separated Upper and Lower Halves of Geotropically Stimulated Corn Coleoptiles

Cited by 15 publications

References 28 publications

Gravitropic Movement in Wheat Coleoptile is Regulated by Ultradian Growth Oscillations

Gravitropic Movement in Wheat Coleoptile is Regulated by Ultradian Growth Oscillations

Physiology of Movements in Stems of Seedling Pisum sativum L. cv Alaska

Epigenetic Memory as a Basis for Intelligent Behavior in Clonal Plants

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