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

Although mechanisms that activate organogenesis in plants are well established, much less is known about the subsequent fine-tuning of cell proliferation, which is crucial for creating properly structured and sized organs. Here we show, through analysis of temperature-dependent fasciation (TDF) muta...

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Bibliographic Details
Published in:eLife 2021-01, Vol.10
Main Authors: Otsuka, Kurataka, Mamiya, Akihito, Konishi, Mineko, Nozaki, Mamoru, Kinoshita, Atsuko, Tamaki, Hiroaki, Arita, Masaki, Saito, Masato, Yamamoto, Kayoko, Hachiya, Takushi, Noguchi, Ko, Ueda, Takashi, Yagi, Yusuke, Kobayashi, Takehito, Nakamura, Takahiro, Sato, Yasushi, Hirayama, Takashi, Sugiyama, Munetaka
Format: Article
Language:English
Subjects:
Arabidopsis - genetics
Arabidopsis - growth & development
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
Arabidopsis thaliana
Cell division
cell division control
Cell growth
Cell proliferation
Developmental biology
Gene expression
lateral root
Mitochondria
mitochondrial RNA processing
Morphogenesis
mRNA
Mutants
Mutation
Organogenesis
Organogenesis, Plant
pentatricopeptide repeat protein
Physiological aspects
Plant Biology
Plant Roots - growth & development
Plants
poly(A)-specific ribonuclease
Proteins
Reactive oxygen species
RNA
RNA editing
RNA processing
RNA Processing, Post-Transcriptional
RNA, Mitochondrial - metabolism
Temperature
temperature-dependent fasciation
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Summary:Although mechanisms that activate organogenesis in plants are well established, much less is known about the subsequent fine-tuning of cell proliferation, which is crucial for creating properly structured and sized organs. Here we show, through analysis of temperature-dependent fasciation (TDF) mutants of Arabidopsis, ( ), , and ( ), that mitochondrial RNA processing is required for limiting cell division during early lateral root (LR) organogenesis. These mutants formed abnormally broadened (i.e. fasciated) LRs under high-temperature conditions due to extra cell division. All TDF proteins localized to mitochondria, where they were found to participate in RNA processing: RRD1 in mRNA deadenylation, and RRD2 and RID4 in mRNA editing. Further analysis suggested that LR fasciation in the TDF mutants is triggered by reactive oxygen species generation caused by defective mitochondrial respiration. Our findings provide novel clues for the physiological significance of mitochondrial activities in plant organogenesis.
ISSN:2050-084X
2050-084X
DOI:10.7554/elife.61611