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Diffusible repression of cytokinin signalling produces endodermal symmetry and passage cells

(2018) NATURE. 555(7697). p.529-533
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Abstract
In vascular plants, the root endodermis surrounds the central vasculature as a protective sheath that is analogous to the polarized epithelium in animals, and contains ring-shaped Casparian strips that restrict diffusion(1). After an initial lag phase, individual endodermal cells suberize in an apparently random fashion to produce 'patchy' suberization that eventually generates a zone of continuous suberin deposition(2). Casparian strips and suberin lamellae affect paracellular and transcellular transport, respectively. Most angiosperms maintain some isolated cells in an unsuberized state(3) as so-called 'passage cells', which have previously been suggested to enable uptake across an otherwise impermeable endodermal barrier(3,4). Here we demonstrate that these passage cells are late emanations of a meristematic patterning process that reads out the underlying non-radial symmetry of the vasculature. This process is mediated by the non-cell-autonomous repression of cytokinin signalling in the root meristem, and leads to distinct phloem- and xylem-pole-associated endodermal cells. The latter cells can resist abscisic acid-dependent suberization to produce passage cells. Our data further demonstrate that, during meristematic patterning, xylem-pole-associated endodermal cells can dynamically alter passage-cell numbers in response to nutrient status, and that passage cells express transporters and locally affect the expression of transporters in adjacent cortical cells.
Keywords
TRANSCRIPTION FACTOR, ARABIDOPSIS, ROOTS, AUXIN, DIFFERENTIATION, TRANSDUCTION, MERISTEM, SYSTEM, PHO1

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Chicago
Andersen, Tonni Grube, Sadaf Naseer, Robertas Ursache, Brecht Wybouw, Wouter Smet, Bert De Rybel, Joop EM Vermeer, and Niko Geldner. 2018. “Diffusible Repression of Cytokinin Signalling Produces Endodermal Symmetry and Passage Cells.” Nature 555 (7697): 529–533.
APA
Andersen, T. G., Naseer, S., Ursache, R., Wybouw, B., Smet, W., De Rybel, B., Vermeer, J. E., et al. (2018). Diffusible repression of cytokinin signalling produces endodermal symmetry and passage cells. NATURE, 555(7697), 529–533.
Vancouver
1.
Andersen TG, Naseer S, Ursache R, Wybouw B, Smet W, De Rybel B, et al. Diffusible repression of cytokinin signalling produces endodermal symmetry and passage cells. NATURE. 2018;555(7697):529–33.
MLA
Andersen, Tonni Grube, Sadaf Naseer, Robertas Ursache, et al. “Diffusible Repression of Cytokinin Signalling Produces Endodermal Symmetry and Passage Cells.” NATURE 555.7697 (2018): 529–533. Print.
@article{8561867,
  abstract     = {In vascular plants, the root endodermis surrounds the central vasculature as a protective sheath that is analogous to the polarized epithelium in animals, and contains ring-shaped Casparian strips that restrict diffusion(1). After an initial lag phase, individual endodermal cells suberize in an apparently random fashion to produce 'patchy' suberization that eventually generates a zone of continuous suberin deposition(2). Casparian strips and suberin lamellae affect paracellular and transcellular transport, respectively. Most angiosperms maintain some isolated cells in an unsuberized state(3) as so-called 'passage cells', which have previously been suggested to enable uptake across an otherwise impermeable endodermal barrier(3,4). Here we demonstrate that these passage cells are late emanations of a meristematic patterning process that reads out the underlying non-radial symmetry of the vasculature. This process is mediated by the non-cell-autonomous repression of cytokinin signalling in the root meristem, and leads to distinct phloem- and xylem-pole-associated endodermal cells. The latter cells can resist abscisic acid-dependent suberization to produce passage cells. Our data further demonstrate that, during meristematic patterning, xylem-pole-associated endodermal cells can dynamically alter passage-cell numbers in response to nutrient status, and that passage cells express transporters and locally affect the expression of transporters in adjacent cortical cells.},
  author       = {Andersen, Tonni Grube and Naseer, Sadaf and Ursache, Robertas and Wybouw, Brecht and Smet, Wouter and De Rybel, Bert and Vermeer, Joop EM and Geldner, Niko},
  issn         = {0028-0836},
  journal      = {NATURE},
  language     = {eng},
  number       = {7697},
  pages        = {529--533},
  title        = {Diffusible repression of cytokinin signalling produces endodermal symmetry and passage cells},
  url          = {http://dx.doi.org/10.1038/nature25976},
  volume       = {555},
  year         = {2018},
}

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