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Updated: Jun 6, 2026

Lateral Root Inducible System in Arabidopsis and Maize
Published on: January 14, 2016
Ethylene directs auxin to control root cell expansion
Lucia C Strader1, Grace L Chen, Bonnie Bartel
1Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77005, USA.
Ethylene overproduction in plants can restore auxin responsiveness, suggesting ethylene directs auxin to control root cell expansion. This study explores the crosstalk between these vital plant hormones.
Area of Science:
- Plant Biology
- Molecular Biology
- Genetics
Background:
- Root morphogenesis relies on precise regulation of cell division and expansion.
- Plant hormones auxin and ethylene are crucial regulators of plant growth and development.
- Understanding hormone crosstalk is key to deciphering complex developmental processes.
Purpose of the Study:
- To investigate the interaction between auxin and ethylene in controlling root epidermal and root hair cell elongation.
- To elucidate the role of ethylene overproduction in suppressing auxin-related root growth defects.
Main Methods:
- Isolation and characterization of the eto1 ethylene overproducer allele as a suppressor of the auxin-resistant mutant ibr5.
- Analysis of eto1 interactions with mutants affecting auxin response and transport.
- Assessment of ethylene's effects on root cell expansion under altered auxin signaling conditions.
Main Results:
- Ethylene overproduction partially restored auxin responsiveness in auxin-response and auxin-transport mutants.
- Reducing auxin signaling partially impeded, while blocking auxin influx fully suppressed, ethylene's effects on root cell expansion.
- Data indicate a regulatory link where ethylene influences auxin's role in cell expansion.
Conclusions:
- Ethylene plays a significant role in modulating auxin's function in root cell elongation.
- Endogenous ethylene appears to direct auxin activity to control root cell expansion.
- This study reveals novel insights into the crosstalk between auxin and ethylene in plant development.
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