Diffusible repression of cytokinin signalling produces endodermal symmetry and passage cells.

Détails

ID Serval
serval:BIB_DA2ADB547BE2
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Diffusible repression of cytokinin signalling produces endodermal symmetry and passage cells.
Périodique
Nature
Auteur(s)
Andersen T.G., Naseer S., Ursache R., Wybouw B., Smet W., De Rybel B., Vermeer JEM, Geldner N.
ISSN
1476-4687 (Electronic)
ISSN-L
0028-0836
Statut éditorial
Publié
Date de publication
2018
Peer-reviewed
Oui
Volume
555
Numéro
7697
Pages
529-533
Langue
anglais
Résumé
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. 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. Casparian strips and suberin lamellae affect paracellular and transcellular transport, respectively. Most angiosperms maintain some isolated cells in an unsuberized state as so-called 'passage cells', which have previously been suggested to enable uptake across an otherwise-impermeable endodermal barrier. 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.

Pubmed
Web of science
Création de la notice
15/03/2018 18:07
Dernière modification de la notice
13/04/2018 6:26
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