ANAC032 regulates root growth through the MYB30 gene regulatory network
Hiromasa Maki1, Satomi Sakaoka2, Tomotaka Itaya3
1Graduate School of Bioagricultural Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8601, Japan.
Scientific Reports
|August 8, 2019
Summary
Reactive oxygen species (ROS) regulate root growth. ANAC032, a transcription factor, was identified as an upstream regulator of MYB30, controlling root cell elongation under ROS signaling.
Area of Science:
- Plant Biology
- Molecular Biology
- Genetics
Background:
- Reactive oxygen species (ROS) are crucial for regulating plant root growth.
- A previously developed transcriptomic atlas, ROS-map, identified ROS-responsive genes in Arabidopsis root tips.
- MYB30 was previously characterized as a key transcription factor in ROS-mediated root cell elongation.
Purpose of the Study:
- To characterize the function of ANAC032, an early ROS-responsive transcription factor, in Arabidopsis root growth.
- To elucidate the role of ANAC032 within the context of ROS signaling pathways.
- To investigate the relationship between ANAC032 and MYB30 in regulating root development.
Main Methods:
- Gene overexpression (ANAC032-VP16) to assess phenotypic effects.
- Transcriptome analysis to identify ANAC032-regulated genes.
- Genetic analysis using myb30-2 mutants to determine the genetic interaction between ANAC032 and MYB30.
Main Results:
- Overexpression of ANAC032-VP16 inhibited root growth, primarily by reducing cell elongation.
- Transcriptome analysis revealed ANAC032 regulates numerous stress-responsive genes.
- ANAC032 was found to upregulate MYB30 and its downstream target genes, a process dependent on functional MYB30.
- Root growth inhibition by ANAC032 was alleviated in myb30-2 mutants.
Conclusions:
- ANAC032 functions upstream of the MYB30 transcriptional cascade.
- ANAC032 is a key regulator of root cell elongation in response to ROS signaling.
- This study reveals a novel regulatory pathway involving ANAC032 and MYB30 in plant root development.
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