Ecological significance of root tip rotation for seedling establishment of <i>Oryza sativa</i> L.

Inoue, Naoto; Arase, Teruo; Hagiwara, Motoyuki; Amano, Takehiko; Hayashi, Taiichi; Ikeda, Ryoichi

doi:10.1046/j.1440-1703.1999.141282.x

Cited by 39 publications

(27 citation statements)

References 9 publications

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“…In rice (Oryza sativa), nutation of roots has been reported to increase soil penetration (Inoue et al, 1999). Whether this is true for other species or for the hypocotyl is unknown.…”

Section: Discussionmentioning

confidence: 99%

Ethylene Stimulates Nutations That Are Dependent on the ETR1 Receptor

et al. 2006

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Ethylene influences a number of processes in Arabidopsis (Arabidopsis thaliana) through the action of five receptors. In this study, we used high-resolution, time-lapse imaging to examine the long-term effects of ethylene on growing, etiolated Arabidopsis seedlings. These measurements revealed that ethylene stimulates nutations of the hypocotyls with an average delay in onset of over 6 h. The nutation response was constitutive in ctr1-2 mutants maintained in air, whereas ein2-1 mutants failed to nutate when treated with ethylene. Ethylene-stimulated nutations were also eliminated in etr1-7 loss-of-function mutants. Transformation of the etr1-7 mutant with a wild-type genomic ETR1 transgene rescued the nutation phenotype, further supporting a requirement for ETR1. Loss-of-function mutations in the other receptor isoforms had no effect on ethylene-stimulated nutations. However, the double ers1-2 ers2-3 and triple etr2-3 ers2-3 ein4-4 loss-of-function mutants constitutively nutated in air. These results support a model where all the receptors are involved in ethylene-stimulated nutations, but the ETR1 receptor is required and has a contrasting role from the other receptor isoforms in this nutation phenotype. Naphthylphthalamic acid eliminated ethylenestimulated nutations but had no effect on growth inhibition caused by ethylene, pointing to a role for auxin transport in the nutation phenotype.

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“…In rice (Oryza sativa), nutation of roots has been reported to increase soil penetration (Inoue et al, 1999). Whether this is true for other species or for the hypocotyl is unknown.…”

Section: Discussionmentioning

confidence: 99%

Ethylene Stimulates Nutations That Are Dependent on the ETR1 Receptor

et al. 2006

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“…In Oryza sativa, root circumnutation plays an important role in establishment of seedlings on flooded and soft soil. 61,62 Therefore, there is mounting evidence that circumnutations have specific ecological functions and are not merely a way of growth.…”

Section: Function Of Circumnutation Movement In Plant's Lifementioning

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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“…Circumnutation can be disturbed until growth is disturbed, or growth can be disturbed without significant disturbance in the circumnutation intensity and period. The hypothesis about the partial autonomy of circumnutation in relation to growth contributes to explanation of a special ecological and physiological function of circumnutation being not only the way of growth (Darwin and Darwin 1880;Inoue et al 1999;Larson 2000;Kosuge et al 2013;Migliaccio et al 2013). …”

Section: Distinguishing Between Growth and Circumnutating Behaviourmentioning

confidence: 99%

Lithium distinguishes between growth and circumnutation and augments glutamate-induced excitation of Helianthus annuus seedlings

2015

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An effect of lithium (Li ? ) on growth, circumnutation, and glutamate-induced excitation in sunflower (Helianthus annuus L.) seedlings was investigated using time-lapse photography and extracellular electrical potential measurements. The seedlings were treated with a micro and millimolar concentration of lithium chloride (LiCl) both persistently in a hydroponic medium and acutely through Li ? injection. The length of hypocotyls, fresh weight of seedlings, intensity and period of circumnutation, and the number of action potentials (APs) after glutamate (Glu) injection were determined. It was found that the circumnutation intensity and period did not depend on hypocotyl length and fresh weight of seedlings. Under persistent Li ? treatment, the circumnutation intensity was constant at a concentration between 0.2 and 20 mM although the hypocotyls were significantly shorter in relation to the control, whereas at a concentration of 40 mM circumnutation intensity decreased without any changes in the hypocotyl length. Under persistent treatment with 0.5 and 20 mM Li ? , the period of circumnutation was significantly prolonged. The number of APs in a Glu-induced series significantly increased in the seedlings exhibiting an Li ? -induced decrease in circumnutation intensity (in 40 and 60 mM Li ? ). Additionally Li ? injection before Glu injection also augmented the series of APs in seedlings growing without Li ? in hydroponic medium. These Li ? -sensitive responses demonstrated that circumnutation and growth are partly independent processes and reveal a relationship between circumnutation intensity and excitability in Helianthus annuus seedlings.

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Ecological significance of root tip rotation for seedling establishment of Oryza sativa L.

Cited by 39 publications

References 9 publications

Ethylene Stimulates Nutations That Are Dependent on the ETR1 Receptor

Ethylene Stimulates Nutations That Are Dependent on the ETR1 Receptor

Circumnutation as a visible plant action and reaction

Lithium distinguishes between growth and circumnutation and augments glutamate-induced excitation of Helianthus annuus seedlings

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