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Updated: Aug 9, 2026
09:23
Lateral Root Inducible System in Arabidopsis and Maize
Published on: January 14, 2016
A pathway for lateral root formation in Arabidopsis thaliana
J L Celenza1, P L Grisafi, G R Fink
1Whitehead Institute for Biomedical Research, Cambridge, Massachusets 02142, USA.
Genes & Development
|September 1, 1995
Summary
Plant hormone indole-3-acetic acid (IAA) is crucial for lateral root development. Mutants reveal IAA
Area of Science:
- Plant biology
- Developmental biology
- Hormone signaling
Background:
- Lateral root formation is a key process in plant architecture.
- Indole-3-acetic acid (IAA) is a primary auxin hormone regulating plant growth and development.
- Understanding the genetic control of lateral root initiation and maturation is essential for plant science.
Purpose of the Study:
- To dissect the developmental program of lateral root formation in plants.
- To identify specific roles of indole-3-acetic acid (IAA) in lateral root initiation and maturation.
- To elucidate the genetic basis of lateral root development using plant mutants.
Main Methods:
- Isolation and characterization of plant mutants affecting lateral root development (alf1-1, alf4-1, alf3-1).
- Phenotypic analysis of lateral root proliferation, initiation, and maturation in wild-type and mutant plants.
- Complementation analysis using IAA to assess mutant rescue and hormone dependency.
Main Results:
- The alf1-1 mutant exhibited hyperproliferation of lateral roots.
- The alf4-1 mutant was completely blocked in lateral root initiation.
- The alf3-1 mutant showed defects in lateral root maturation and could be rescued by IAA, while alf4-1 could not.
Conclusions:
- Indole-3-acetic acid (IAA) plays a dual role in lateral root development.
- IAA is required for the initiation of cell division in the pericycle.
- IAA promotes cell division and maintains cell viability during lateral root maturation.
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