Reorientation of Cortical Microtubule Arrays in the Hypocotyl of Arabidopsis thaliana Is Induced by the Cell Growth Process and Independent of Auxin Signaling

Autor: Jiří Friml, Lanxin Li, Maciek Adamowski
Rok vydání: 2019
Předmět:
0106 biological sciences
0301 basic medicine
Transcription
Genetic
Arabidopsis
cortical microtubule array reorientation
Cell Growth Process
01 natural sciences
Models
Biological
cortical microtubule arrays
Catalysis
Article
Hypocotyl
Inorganic Chemistry
microtubules
lcsh:Chemistry
03 medical and health sciences
Microtubule
Auxin
Transcription (biology)
cell growth
Glycosides
Physical and Theoretical Chemistry
Molecular Biology
lcsh:QH301-705.5
Spectroscopy
Cell Proliferation
chemistry.chemical_classification
Indoleacetic Acids
Cell growth
Chemistry
Organic Chemistry
fungi
food and beverages
General Medicine
Computer Science Applications
Cell biology
030104 developmental biology
lcsh:Biology (General)
lcsh:QD1-999
Signal transduction
auxin
Cortical microtubule
010606 plant biology & botany
Signal Transduction
Zdroj: International Journal of Molecular Sciences
International Journal of Molecular Sciences, Vol 20, Iss 13, p 3337 (2019)
Volume 20
Issue 13
ISSN: 1422-0067
DOI: 10.3390/ijms20133337
Popis: Cortical microtubule arrays in elongating epidermal cells in both the root and stem of plants have the propensity of dynamic reorientations that are correlated with the activation or inhibition of growth. Factors regulating plant growth, among them the hormone auxin, have been recognized as regulators of microtubule array orientations. Some previous work in the field has aimed at elucidating the causal relationship between cell growth, the signaling of auxin or other growth-regulating factors, and microtubule array reorientations, with various conclusions. Here, we revisit this problem of causality with a comprehensive set of experiments in Arabidopsis thaliana, using the now available pharmacological and genetic tools. We use isolated, auxin-depleted hypocotyls, an experimental system allowing for full control of both growth and auxin signaling. We demonstrate that reorientation of microtubules is not directly triggered by an auxin signal during growth activation. Instead, reorientation is triggered by the activation of the growth process itself and is auxin-independent in its nature. We discuss these findings in the context of previous relevant work, including that on the mechanical regulation of microtubule array orientation.
Databáze: OpenAIRE
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