Root growth is modulated by differential hormonal sensitivity in neighboring cells

Yulia Fridman, Liron Elkouby, Neta Holland, Kristina Vragović, Rivka Elbaum, Sigal Savaldi-Goldstein*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

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.

Original languageAmerican English
Pages (from-to)912-920
Number of pages9
JournalGenes and Development
Volume28
Issue number8
DOIs
StatePublished - 15 Apr 2014

Keywords

  • Brassinosteroids
  • Cell size determination
  • Cell wall
  • Hormone signaling
  • Intercellular communication
  • Root development

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