Riboflavin integrates cellular energetics and cell cycle to regulate maize seed development
Qiuzhen Tian1, Gang Wang2, Xuexia Ma3
1National Key Laboratory of Wheat and Maize Crops Science, CIMMYT-Henan Joint Center for Wheat and Maize Improvement, Collaborative Innovation Center of Henan Grain Crops, College of Agronomy, Henan Agricultural University, Zhengzhou, China.
Plant Biotechnology Journal
|April 15, 2022
Summary
Maize mutant o18 reveals riboflavin
Area of Science:
- Plant biology
- Biochemistry
- Genetics
Background:
- Riboflavin (vitamin B2) is vital for metabolism, with plants synthesizing it via a conserved pathway.
- The role of riboflavin in regulating maize seed development remains unclear.
Purpose of the Study:
- Investigate the function of the maize opaque mutant o18.
- Elucidate the mechanism of riboflavin in maize endosperm development.
Main Methods:
- Characterization of the maize opaque mutant o18.
- Analysis of riboflavin biosynthesis pathway and its impact on cellular energy and cell cycle.
- Epigenetic analysis (H3K4me3 levels) in mutant and wild-type maize.
Main Results:
- The o18 mutant, encoding ZmRIBA1, impairs riboflavin synthesis, leading to increased lysine and reduced endosperm filling.
- Loss of ZmRIBA1 disrupts mitochondrial respiratory complexes, shifts metabolism to glycolysis, and causes cell-cycle arrest.
- Increased H3K4me3 levels in o18 suggest an epigenetic mechanism for cell-cycle progression under stress.
- Overexpressing O18 enhances riboflavin production and osmotic tolerance.
Conclusions:
- Riboflavin is crucial for coordinating cellular energy and cell cycle in maize endosperm development.
- The ZmRIBA1 enzyme plays a key role in this process.
- Epigenetic modifications may act as a backup for cell-cycle regulation.
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