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Updated: Oct 17, 2025

Lateral Root Inducible System in Arabidopsis and Maize

Lateral Root Inducible System in Arabidopsis and Maize

Published on: January 14, 2016

Auxin controls the division of root endodermal cells.

Deok Hyun Seo¹, Haewon Jeong¹, Yang Do Choi²

¹School of Biological Sciences and Technology, Chonnam National University, Gwangju 61186, Republic of Korea.

Plant Physiology

|October 7, 2021

Summary

Auxin controls root endodermal cell division in Arabidopsis thaliana, a process crucial for forming the Casparian strip barrier. This study identifies key auxin transport proteins involved in regulating this essential cell division.

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Published on: March 15, 2018

Area of Science:

Plant Biology
Developmental Biology
Cell Biology

Background:

The root endodermis establishes a vital selective barrier, the Casparian strip, essential for regulating solute uptake into the plant vasculature.
Endodermal cells, unlike other root cell types, typically do not divide within the root apical meristem.

Purpose of the Study:

To investigate the role of auxin in regulating endodermal cell division in Arabidopsis thaliana.
To identify molecular mechanisms linking auxin response and transport to endodermal cell division.

Main Methods:

Investigated endodermal cell division in wild-type and auxin signaling mutant Arabidopsis thaliana.
Utilized genetic manipulation, including endodermis-specific gene expression (EN7::ΔARF5) and knockout mutants (auxin resistant3-1, PGP1, PGP19).
Applied auxin treatment and auxin transport inhibitors to modulate auxin levels and signaling in root cells.

Main Results:

Auxin treatment and endodermal activation of auxin response (EN7::ΔARF5) induced endodermal cell division in wild-type plants.
Mutants defective in auxin signaling (auxin resistant3-1) or auxin transport (PGP1, PGP19) exhibited altered endodermal cell division patterns.
Accumulation of auxin within endodermal cells, induced by transport inhibitors, also promoted cell division.

Conclusions:

Auxin is a critical regulator of root endodermal cell division, directly influencing the formation of the Casparian strip.
Specific auxin efflux carriers, P-GLYCOPROTEIN1 (PGP1) and PGP19, play a significant role in mediating auxin flow and consequently regulating endodermal cell division.