title: Root growth is modulated by differential hormonal sensitivity in neighboring cells.
abstract: Coherent plant growth requires spatial integration of hormonal pathways and cell wall remodeling activities. However, the mechanisms governing sensitivity to hormones and how cell wall structure integrates with hormonal effects are poorly understood. We found that coordination between two types of epidermal root cells, hair and nonhair cells, establishes root sensitivity to the plant hormones brassinosteroids (BRs). While expression of the BR receptor BRASSINOSTEROID-INSENSITIVE1 (BRI1) in hair cells promotes cell elongation in all tissues, its high relative expression in nonhair cells is inhibitory. Elevated ethylene and deposition of crystalline cellulose underlie the inhibitory effect of BRI1. We propose that the relative spatial distribution of BRI1, and not its absolute level, fine-tunes growth.
authors.affiliation: Faculty of Biology, Technion-Israel Institute of Technology, Haifa 3200003, Israel;
authors.forename: Yulia
authors.initials: Y
authors.lastname: Fridman
authors.forename: Liron
authors.initials: L
authors.lastname: Elkouby
authors.forename: Neta
authors.initials: N
authors.lastname: Holland
authors.forename: Kristina
authors.initials: K
authors.lastname: Vragović
authors.forename: Rivka
authors.initials: R
authors.lastname: Elbaum
authors.forename: Sigal
authors.initials: S
authors.lastname: Savaldi-Goldstein
mesh_terms: D017360:Arabidopsis / Q000166:cytology / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism; D060406:Brassinosteroids / Q000378:metabolism*; D049108:Cell Enlargement; D002482:Cellulose / Q000378:metabolism; D005030:Ethylenes / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D018517:Plant Roots / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism; D011494:Protein Kinases / Q000235:genetics
chemical_list: D029681:Arabidopsis Proteins; D060406:Brassinosteroids; D005030:Ethylenes; D002482:Cellulose; C036216:ethylene; D011494:Protein Kinases; C108270:BRI1 protein, Arabidopsis
keywords: brassinosteroids; cell size determination; cell wall; hormone signaling; intercellular communication; root development
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