title: The Arabidopsis ACR4 gene plays a role in cell layer organisation during ovule integument and sepal margin development.
abstract: The mechanisms regulating cell layer organisation in developing plant organs are fundamental to plant growth, but remain largely uninvestigated. We have studied the receptor kinase-encoding ARABIDOPSIS CRINKLY4 gene and shown that its expression is restricted to the L1 cell layer of most meristems and organ primordia, including those of the ovule integuments. Insertion mutations show that ARABIDOPSIS CRINKLY4 is required for regulation of cellular organisation during the development of sepal margins and ovule integument outgrowth. We show that ARABIDOPSIS CRINKLY4 encodes a functional kinase that, in ovules and possibly other tissues, is abundant in anticlinal and the inner periclinal plasma membrane of 'outside' cells. We propose that ARABIDOPSIS CRINKLY4 may be involved in maintaining L1 cell layer integrity by receiving and transmitting signals from neighbouring L1 cells and/or from underlying cell layers.
authors.affiliation: Institute of Cell and Molecular Biology, Kings Buildings, University of Edinburgh, Edinburgh EH9 3JR, UK.
authors.forename: Miriam L
authors.initials: ML
authors.lastname: Gifford
authors.forename: Samuel
authors.initials: S
authors.lastname: Dean
authors.forename: Gwyneth C
authors.initials: GC
authors.lastname: Ingram
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000254:growth & development* / Q000648:ultrastructure; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D002462:Cell Membrane / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D017930:Genes, Reporter; D009024:Morphogenesis; D010641:Phenotype; D011401:Promoter Regions, Genetic; D011494:Protein Kinases / Q000235:genetics / Q000378:metabolism*; D017346:Protein Serine-Threonine Kinases; D011956:Receptors, Cell Surface / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012639:Seeds / Q000502:physiology* / Q000648:ultrastructure
chemical_list: D029681:Arabidopsis Proteins; D011956:Receptors, Cell Surface; D011993:Recombinant Fusion Proteins; D011494:Protein Kinases; C462019:ACR4 protein, Arabidopsis; D017346:Protein Serine-Threonine Kinases