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Nucleolar stress and sugar response in plants
Shugo Maekawa1, Shuichi Yanagisawa1
1a Biotechnology Research Center , The University of Tokyo , Yayoi 1-1-1, Bunkyo-ku, Tokyo , Japan.
Plant Signaling & Behavior
|February 22, 2018
Summary
Sugar supply impacts ribosome biogenesis in plants. APUM24 gene defects cause sugar-dependent growth issues and nucleolar stress, suggesting a p53-independent pathway regulating plant development.
Area of Science:
- Plant molecular biology
- Cellular stress responses
- Ribosome biogenesis
Background:
- Ribosome biogenesis is crucial for cellular function and must adapt to energy availability.
- In animals, ribosome biogenesis defects trigger p53-mediated nucleolar stress.
- The plant gene APUM24 is involved in pre-ribosomal RNA processing.
Purpose of the Study:
- To investigate the role of APUM24 in plants.
- To understand the relationship between sugar response, ribosome biogenesis, nucleolar stress, and growth regulation in plants.
Main Methods:
- Analysis of APUM24 knockdown mutants in Arabidopsis.
- Phenotypic characterization under varying sugar conditions.
- Assessment of pre-rRNA processing, nucleolar size, and growth parameters.
Main Results:
- APUM24 knockdown mutants exhibited sugar-dependent phenotypes.
- These phenotypes included pre-rRNA processing defects and reduced nucleolar size.
- Leaf and root growth were limited in the mutants, correlating with sugar levels.
Conclusions:
- Sugar supply may exacerbate ribosome biogenesis defects in plants.
- This can lead to p53-independent nucleolar stress responses.
- These responses negatively regulate plant growth and development.
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