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Related Experiment Video

Updated: Apr 18, 2026

Lateral Root Inducible System in Arabidopsis and Maize

Lateral Root Inducible System in Arabidopsis and Maize

Published on: January 14, 2016

Auxin-induced degradation dynamics set the pace for lateral root development.

Jessica M Guseman¹, Antje Hellmuth², Amy Lanctot¹

¹Department of Biology, University of Washington, Seattle, WA 98195, USA.

Development (Cambridge, England)

|January 31, 2015

Summary

Auxin signaling relies on Aux/IAA protein degradation. This study shows that the speed of Aux/IAA degradation acts as a timer, controlling plant development, specifically lateral root formation.

Keywords:

Arabidopsis Phytohormone Saccharomyces Ubiquitin

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Area of Science:

Plant biology
Molecular signaling
Developmental biology

Background:

Auxin regulates plant growth and development via nuclear signaling pathways.
The Aux/IAA family of transcriptional co-repressors are key targets for auxin-induced degradation.
Previous research indicated varying degradation rates for Aux/IAA proteins in vitro, but their in vivo significance was unclear.

Purpose of the Study:

To investigate whether the rate of auxin-induced Aux/IAA protein turnover influences the pace of auxin-regulated developmental events.
To test the hypothesis that Aux/IAA degradation rates act as timers for developmental transitions.

Main Methods:

Utilized the model system of lateral root development in Arabidopsis.
Generated transgenic plants expressing modified versions of the IAA14 gene, encoding a key regulator of lateral root initiation.
Engineered variants of IAA14 with altered degradation rates.

Main Results:

The progression of lateral root development stages directly correlated with the engineered degradation rates of IAA14.
Faster IAA14 turnover led to accelerated lateral root development, while slower turnover resulted in delayed development.

Conclusions:

Auxin/Indole-3-acetic acid (Aux/IAA) proteins function as auxin-initiated timers.
The turnover rate of Aux/IAAs is a critical factor in synchronizing developmental transitions, such as lateral root initiation.
This provides a mechanistic link between auxin signaling dynamics and developmental timing in plants.