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Related Experiment Video

Updated: Nov 21, 2025

Discrimintion and Mapping of the Primary and Processed Transcripts in Maize Mitochondrion Using a Circular RT-PCR-based Strategy

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Published on: July 29, 2019

Temperature-dependent fasciation mutants provide a link between mitochondrial RNA processing and lateral root

Kurataka Otsuka¹, Akihito Mamiya¹, Mineko Konishi¹

¹Botanical Gardens, Graduate School of Science, The University of Tokyo, Tokyo, Japan.

|January 14, 2021

Summary

Mitochondrial RNA processing limits cell division during plant lateral root development. Defects in this process, particularly at high temperatures, lead to abnormal organ growth and fasciation.

Keywords:

A. thaliana cell division control lateral root mitochondrial RNA processing pentatricopeptide repeat protein plant biology poly(A)-specific ribonuclease temperature-dependent fasciation

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Published on: September 30, 2016

Area of Science:

Plant Biology
Molecular Biology
Genetics

Background:

Organogenesis in plants relies on precise control of cell proliferation.
Mechanisms fine-tuning cell division post-organogenesis initiation are less understood.
Mitochondrial functions in plant organ development require further elucidation.

Purpose of the Study:

Investigate the role of mitochondrial RNA processing in regulating cell division during lateral root organogenesis.
Identify genes involved in temperature-dependent fasciation and their mitochondrial functions.

Main Methods:

Analysis of temperature-dependent fasciation (TDF) mutants in Arabidopsis: rrd1, rrd2, and rid4.
Subcellular localization studies of TDF proteins.
Investigation of RNA processing activities (deadenylation, editing) and mitochondrial respiration.

Main Results:

TDF mutants (rrd1, rrd2, rid4) exhibit fasciation in lateral roots at high temperatures due to excessive cell division.
TDF proteins localize to mitochondria and are involved in mRNA deadenylation (RRD1) and editing (RRD2, RID4).
Fasciation is linked to reactive oxygen species generation from impaired mitochondrial respiration.

Conclusions:

Mitochondrial RNA processing is essential for limiting cell division during lateral root organogenesis.
Defective mitochondrial respiration and subsequent reactive oxygen species production trigger fasciation.
This study highlights the critical role of mitochondrial activity in plant organ size and structure control.