4.5 Article

Auxin gradient is crucial for the maintenance of root distal stem cell identity in Arabidopsis

Journal

PLANT SIGNALING & BEHAVIOR
Volume 8, Issue 12, Pages -

Publisher

TAYLOR & FRANCIS INC
DOI: 10.4161/psb.26429

Keywords

auxin; auxin maximum; auxin gradient; QC; root

Funding

  1. National Natural Science Foundation of China [31222005, 31270327]
  2. Shandong University of China and from Ministry of Education [11200081963024]
  3. 1000-talents Plan from China for young researchers [11200095551303]
  4. Independent Innovation Foundation of Shandong University, IIFSDU [2011TB012]

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The plant hormone auxin plays a critical role in the maintenance of root stem cell niches in Arabidopsis. We have recently reported that WUSCHEL-RELATED HOMEOBOX5 (WOX5) transcription factor modulates free auxin production in the quiescent center (QC) of the root and its expression is inhibited in a feedback-dependent manner by canonical auxin signaling that involves indole-3-acetic acid 17 (IAA17) auxin response repressor. WOX5-IAA17 feedback circuit assures the maintenance of auxin response maximum in the root tip and thereby contributes to the maintenance of distal stem cell (DSC) populations. Here, we provide evidence to show that an optimal auxin maximum in QC guided auxin signaling gradient in root tips is crucial for maintaining root DSC identity.

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