Transient increase in the levels of γ-tubulin complex and katanin are responsible for reorientation by ethylene and hypergravity of cortical microtubules

Soga, Kouichi; Yamaguchi, Aya; Kotake, Toshihisa; Wakabayashi, Kazuyuki; Hoson, Takayuki

doi:10.4161/psb.5.11.13561

Cited by 9 publications

(8 citation statements)

References 11 publications

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“…A decreased number of bundling events and less-stable bundle structures provide explanations for the previous observation that transverse microtubules are prone to disruption when oriented from transverse to oblique and longitudinal (Soga et al, 2010b;Lindeboom et al, 2013). Stable, organized longitudinal arrays generally orient cellulose fibrils and cellulose fibril arrays during cell wall inhibition of cell growth (Tian et al, 2004;Bashline et al, 2014).…”

Section: Hormone Signaling Participates In Regulation Of Cortical Micmentioning

confidence: 83%

“…The microtubule-severing protein katanin is prone to localization at nucleation sites in order to sever nucleated microtubules and at crossovers sites in order to sever overlapping microtubules to create new arrays during reorientation (Lindeboom et al, 2013;Zhang et al, 2013). Previous models have demonstrated that microtubules in their original orientation are prone to depolymerization, whereas other microtubules build new arrays (Soga et al, 2010b). Although much is known about the roles of the γ-tubulin complex and katanin in regulating microtubule reorientation, questions remain about the underlying mechanisms regarding regulation of microtubule stability in different orientations.…”

Section: Introductionmentioning

confidence: 99%

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Microtubule bundling plays a role in ethylene-mediated cortical microtubule reorientation in etiolated Arabidopsis hypocotyls

Sun

Mao

2016

Journal of Cell Science

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The gaseous hormone ethylene is known to regulate plant growth under etiolated conditions (the 'triple response'). Although organization of cortical microtubules is essential for cell elongation, the underlying mechanisms that regulate microtubule organization by hormone signaling, including ethylene, are ambiguous. In the present study, we demonstrate that ethylene signaling participates in regulation of cortical microtubule reorientation. In particular, regulation of microtubule bundling is important for this process in etiolated hypocotyls. Time-lapse analysis indicated that selective stabilization of microtubule-bundling structures formed in various arrays is related to ethylene-mediated microtubule orientation. Bundling events and bundle growth lifetimes were significantly increased in oblique and longitudinal arrays, but decreased in transverse arrays in wild-type cells in response to ethylene. However, the effects of ethylene on microtubule bundling were partially suppressed in a microtubule-bundling protein WDL5 knockout mutant (wdl5-1). This study suggests that modulation of microtubule bundles that have formed in certain orientations plays a role in reorienting microtubule arrays in response to ethylenemediated etiolated hypocotyl cell elongation.

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Section: Hormone Signaling Participates In Regulation Of Cortical Micmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Microtubule bundling plays a role in ethylene-mediated cortical microtubule reorientation in etiolated Arabidopsis hypocotyls

Sun

Mao

2016

Journal of Cell Science

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“…γ-Tubulin complex and katanin are required for the nucleation of microtubules as branches and the severing of microtubules, respectively (Hamada, 2007;Murata and Hasebe, 2007). The transcript level of γ-tubulin complex and katanin in azuki bean epicotyls was increased transiently under hypergravity conditions (Soga et al, , 2010a. During reorientation of cortical microtubules by ethylene, which also modifies growth anisotropy of shoots, the expression levels of both γ-tubulin complex and katanin genes were increased transiently (Soga et al, 2010a(Soga et al, , 2010b.…”

Section: Growth Anisotropymentioning

confidence: 95%

“…The transcript level of γ-tubulin complex and katanin in azuki bean epicotyls was increased transiently under hypergravity conditions (Soga et al, , 2010a. During reorientation of cortical microtubules by ethylene, which also modifies growth anisotropy of shoots, the expression levels of both γ-tubulin complex and katanin genes were increased transiently (Soga et al, 2010a(Soga et al, , 2010b. Thus, the increase in the number of the nucleated microtubule branch as well as the microtubule-severing activity via upregulation of γ-tubulin complex and katanin genes may be involved in the reorientation of cortical microtubule.…”

Section: Growth Anisotropymentioning

confidence: 99%

Gravity Resistance in Plants

Soga

2010

Biol. Sci. Space

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Gravity resistance is a response that enables the plants to develop against the gravitational force . We have analy ze d the nature and me chanisms of gravit y re sistance using both hypergravity conditions produced by centrifugation and microgravity conditions in space. As the final step of gravity resistance, plants develop a short and thick body and increase the cell wall rigidity in response to the magnitude of the gravitational force. Prompt reorientation of cortical microtubules is involved in the modification of body shape. The regulation of the cell wall rigidity is brought about by modification of the metabolisms of anti-gravitational cell wall polysaccharides and changes in the pH of cell wall fluid. Plants may perceive the gravitational force independently of the direction of stimuli by mechanoreceptors on the plasma membrane in gravity resistance. The development of gravity resistance may serve an important function in the transition of plant ancestors from an aquatic environment to a terrestrial environment.

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“…The immediate precursor of endogenous ethylene, 1 aminocyclopropane 1 carboxylic acid, reduced the percentage of transversely oriented cortical MTs and elevated the percentage of longitudinal ones in azuki bean epicotyls in a dose dependent manner. In addition, it increased the tran sient expression of genes of the γ tubulin complex, VaTUG and VaGCP3 , required for MT nucleation and also the VaKTN1 gene encoding catalytic subunit of katanin p60 important for MT severing during their reorientation [52,78].…”

Section: Ethylene Impact On Cytoskeletonmentioning

confidence: 99%

Effects of phytohormones on the cytoskeleton of the plant cell

Blume

Krasylenko

Yemets

2012

Russ J Plant Physiol

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This review highlights the effects of "classic" phytohormones (auxins, cytokinins, gibberellins, abscisic acid, ethylene, and brassinosteroids) and also of important signaling molecules, such as jasmonic acid, strigolactones, and nitric oxide, on the main components of the plant cytoskeleton, microtubules and microfilaments. The effects of these growth regulators on orientation and organization of microtubules and actin filaments, realization of cytoskeleton dependent processes, expression of tubulin and actin genes, and interaction of various phytohormones in their influence on the cytoskeleton are discussed.

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Transient increase in the levels of γ-tubulin complex and katanin are responsible for reorientation by ethylene and hypergravity of cortical microtubules

Cited by 9 publications

References 11 publications

Microtubule bundling plays a role in ethylene-mediated cortical microtubule reorientation in etiolated Arabidopsis hypocotyls

Microtubule bundling plays a role in ethylene-mediated cortical microtubule reorientation in etiolated Arabidopsis hypocotyls

Gravity Resistance in Plants

Effects of phytohormones on the cytoskeleton of the plant cell

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