Cytokinin-auxin crosstalk in cell type specification

Trends Plant Sci. 2015 May;20(5):291-300. doi: 10.1016/j.tplants.2015.02.003. Epub 2015 Mar 21.

Abstract

Auxin and cytokinin affect cell fate specification transcriptionally and non-transcriptionally, and their roles have been characterised in several founder cell specification and activation contexts. Similarly to auxin, local cytokinin synthesis and response gradients are instructive, and the roles of ARABIDOPSIS RESPONSE REGULATOR 7/15 (ARR7/15) and the negative cytokinin response regulator ARABIDOPSIS HISTIDINE PHOSPHOTRANSFER PROTEIN 6, as well as auxin signalling via MONOPTEROS/BODENLOS, are functionally conserved across different developmental processes. Auxin and cytokinin crosstalk is tissue- and context-specific, and may be synergistic in the shoot apical meristem (SAM) but antagonistic in the root. We review recent advances in understanding the interactions between auxin and cytokinin in pivotal developmental processes, and show that feedback complexity and the multistep nature of specification processes argue against a single morphogenetic signal.

Keywords: ARABIDOPSIS HISTIDINE PHOSPHOTRANSFER PROTEIN 6; ARR15; ARR7; MONOPTEROS/BODENLOS; auxin; crosstalk; cytokinin; founder cell specification.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Arabidopsis / metabolism*
  • Arabidopsis Proteins / metabolism
  • Cytokinins / metabolism*
  • DNA-Binding Proteins / metabolism
  • Gene Expression Regulation, Plant
  • Indoleacetic Acids / metabolism*
  • Transcription Factors / metabolism

Substances

  • ARR15 protein, Arabidopsis
  • ARR7 protein, Arabidopsis
  • Arabidopsis Proteins
  • Cytokinins
  • DNA-Binding Proteins
  • Indoleacetic Acids
  • Transcription Factors