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Antagonistic CLE peptide pathways shape root meristem tissue patterning.

Hang Zhang1, Qian Wang1, Noel Blanco-Touriñán1

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This summary is machine-generated.

Secreted peptide ligands (CLE) and CLAVATA1 (CLV1)-type receptors organize Arabidopsis root stem cell niches. Distinct CLE pathways antagonize each other to control phloem and ground tissue formation.

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Area of Science:

  • Plant biology
  • Developmental biology
  • Molecular signaling

Background:

  • CLAVATA3/EMBRYO SURROUNDING REGION (CLE) peptides and CLAVATA1 (CLV1)-type receptors regulate shoot stem cell niche in Arabidopsis.
  • BARELY ANY MERISTEM 1 (BAM1) and BAM2 are CLV1 homologs crucial for ground tissue layer formation in the root meristem.

Purpose of the Study:

  • Investigate the roles of BAM1/2 in vascular phloem lineage initiation.
  • Elucidate the mechanisms of CLE signaling in root tissue layer organization, focusing on potential antagonistic interactions.

Main Methods:

  • Arabidopsis thaliana genetic analysis
  • Analysis of CLE peptide signaling pathways
  • Investigating receptor kinase interactions

Main Results:

  • BAM1/2 are essential for initiating the vascular phloem lineage in Arabidopsis roots.
  • Unlike the shoot, cross-compensation between CLV1-type receptors is limited in the root.
  • BAM3-mediated CLE45 signaling antagonizes BAM1/2-mediated CLE11/12/13 signaling in phloem initials.
  • Spatiotemporally distinct CLE signaling requirements for phloem initiation and differentiation, influenced by the SHORT ROOT (SHR) pathway.

Conclusions:

  • An intricate, quantitative interplay of distinct and antagonistic CLE signaling pathways organizes tissue layer formation in the Arabidopsis root meristem.
  • The findings reveal novel mechanisms of stem cell niche regulation in the root, distinct from shoot meristem control.