title: A spatial accommodation by neighboring cells is required for organ initiation in Arabidopsis.
abstract: Lateral root formation in plants can be studied as the process of interaction between chemical signals and physical forces during development. Lateral root primordia grow through overlying cell layers that must accommodate this incursion. Here, we analyze responses of the endodermis, the immediate neighbor to an initiating lateral root. Endodermal cells overlying lateral root primordia lose volume, change shape, and relinquish their tight junction-like diffusion barrier to make way for the emerging lateral root primordium. Endodermal feedback is absolutely required for initiation and growth of lateral roots, and we provide evidence that this is mediated by controlled volume loss in the endodermis. We propose that turgidity and rigid cell walls, typical of plants, impose constraints that are specifically modified for a given developmental process.
authors.affiliation: Department of Plant Molecular Biology, Biophore, UNIL-Sorge, University of Lausanne, 1015 Lausanne, Switzerland.
authors.forename: Joop E M
authors.initials: JE
authors.lastname: Vermeer
authors.forename: Daniel
authors.initials: D
authors.lastname: von Wangenheim
authors.forename: Marie
authors.initials: M
authors.lastname: Barberon
authors.forename: Yuree
authors.initials: Y
authors.lastname: Lee
authors.forename: Ernst H K
authors.initials: EH
authors.lastname: Stelzer
authors.forename: Alexis
authors.initials: A
authors.lastname: Maizel
authors.forename: Niko
authors.initials: N
authors.lastname: Geldner
mesh_terms: D017360:Arabidopsis / Q000166:cytology* / Q000187:drug effects / Q000196:embryology*; D002450:Cell Communication; D048430:Cell Shape; D002473:Cell Wall / Q000502:physiology / Q000648:ultrastructure; D007210:Indoleacetic Acids / Q000494:pharmacology; D063246:Organogenesis, Plant / Q000187:drug effects / Q000502:physiology*; D018517:Plant Roots / Q000166:cytology / Q000187:drug effects / Q000196:embryology*; D012639:Seeds / Q000166:cytology* / Q000187:drug effects; D019108:Tight Junctions / Q000502:physiology / Q000648:ultrastructure
chemical_list: D007210:Indoleacetic Acids