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Int. J. Mol. Sci. 2015, 16(8), 19671-19697; doi:10.3390/ijms160819671

Spatial Regulation of Root Growth: Placing the Plant TOR Pathway in a Developmental Perspective

Laboratoire de Génétique et Biophysique des Plantes, Aix-Marseille Université, Marseille F-13009, France
Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche Biologie Végétale & Microbiologie Environnementales, Marseille F-13009, France
Commissariat à l’énergie Atomique et aux Energies Alternatives (CEA), Institut de Biologie Environnementale et Biotechnologie (IBEB), Marseille, F-13009, France
Author to whom correspondence should be addressed.
Academic Editor: Alan C. Leonard
Received: 30 May 2015 / Revised: 11 July 2015 / Accepted: 11 August 2015 / Published: 19 August 2015
(This article belongs to the Special Issue Molecular Machinery of Cell Growth Regulation)
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Plant cells contain specialized structures, such as a cell wall and a large vacuole, which play a major role in cell growth. Roots follow an organized pattern of development, making them the organs of choice for studying the spatio-temporal regulation of cell proliferation and growth in plants. During root growth, cells originate from the initials surrounding the quiescent center, proliferate in the division zone of the meristem, and then increase in length in the elongation zone, reaching their final size and differentiation stage in the mature zone. Phytohormones, especially auxins and cytokinins, control the dynamic balance between cell division and differentiation and therefore organ size. Plant growth is also regulated by metabolites and nutrients, such as the sugars produced by photosynthesis or nitrate assimilated from the soil. Recent literature has shown that the conserved eukaryotic TOR (target of rapamycin) kinase pathway plays an important role in orchestrating plant growth. We will summarize how the regulation of cell proliferation and cell expansion by phytohormones are at the heart of root growth and then discuss recent data indicating that the TOR pathway integrates hormonal and nutritive signals to orchestrate root growth. View Full-Text
Keywords: cell growth; proliferation; elongation; meristem; root; plant; auxin; cytokinin; environment; TOR (target of rapamycin) cell growth; proliferation; elongation; meristem; root; plant; auxin; cytokinin; environment; TOR (target of rapamycin)

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Barrada, A.; Montané, M.-H.; Robaglia, C.; Menand, B. Spatial Regulation of Root Growth: Placing the Plant TOR Pathway in a Developmental Perspective. Int. J. Mol. Sci. 2015, 16, 19671-19697.

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