Defective kernel 66 encodes a GTPase essential for kernel development in maize
Yi Ming Wei1,2, Bo Hui Wang1, Dong Jie Shao1,2
1State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, Shandong 271018, China.
Journal of Experimental Botany
|July 25, 2023
Summary
A novel maize gene, DEK66, is crucial for kernel development. This mitochondrial ribosomal assembly factor impacts cell energy, leading to defective kernels when mutated.
Area of Science:
- Plant Biology
- Mitochondrial Genetics
- Molecular Biology
Background:
- Mitochondria are vital organelles responsible for cellular energy production via oxidative phosphorylation.
- Mitochondrial dysfunction can lead to various cellular defects and developmental issues in plants.
- Ribosome biogenesis is essential for protein synthesis within mitochondria.
Purpose of the Study:
- To identify and characterize genes involved in maize kernel development.
- To investigate the role of mitochondrial ribosomal assembly factors in plant organelle function.
- To understand the impact of DEK66 on maize kernel phenotype and mitochondrial health.
Main Methods:
- Genetic screening to identify mutants with defective maize kernels.
- Gene cloning and characterization of the candidate gene DEK66.
- Analysis of mitochondrial structure and function in wild-type and mutant maize.
- Transcriptome analysis to assess gene expression changes in the mutant.
Main Results:
- A novel mutant, dek66, exhibited defective maize kernels with impaired mitochondrial structure and function.
- DEK66 encodes a mitochondrial ribosomal assembly factor with GTPase activity.
- The dek66 mutant showed increased reactive oxygen species and programmed cell death in endosperm cells.
- Key genes related to nutrient storage, respiratory chain, and mitochondrial ribosomes were significantly altered in the mutant.
Conclusions:
- DEK66 is essential for normal maize kernel development by maintaining mitochondrial integrity and function.
- Mitochondrial ribosomal assembly factors play a critical role in plant organelle biogenesis and cellular homeostasis.
- This study provides insights into the molecular mechanisms underlying mitochondrial dysfunction in maize kernel development.
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