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OsbZIP23 delays flowering by repressing OsMADS14 expression in rice
Kunming Zhang1, Chuyan Chen1, Jun Miao2
1Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding/Zhongshan Biological Breeding Laboratory/Key Laboratory of Plant Functional Genomics of the Ministry of Education, Agricultural College of Yangzhou University, Yangzhou, 225009, China.
Plant Physiology and Biochemistry : PPB
|December 10, 2024
Summary
A rice transcription factor, OsbZIP23, acts as a flowering repressor. It delays the floral transition by suppressing OsMADS14 and interacting with florigen complexes, impacting rice yield and distribution.
Area of Science:
- Plant Biology
- Molecular Genetics
- Agricultural Science
Background:
- Flowering time is crucial for rice (Oryza sativa L.) distribution and yield.
- Floral transition is regulated by florigens (Hd3a, RFT1) interacting with GF14 and OsFD-like bZIP proteins in complexes (FACs/FRCs).
Purpose of the Study:
- To investigate the role of the bZIP transcription factor OsbZIP23 in regulating rice flowering time.
- To elucidate the molecular mechanisms underlying OsbZIP23's function in floral transition.
Main Methods:
- Analysis of transgenic plants overexpressing OsbZIP23 and osbzip23 mutants under varying light conditions.
- Molecular and biochemical assays to determine OsbZIP23's binding targets and interactions.
Main Results:
- Overexpression of OsbZIP23 delayed flowering, while mutants showed slightly earlier flowering.
- OsbZIP23 directly binds to the 5' UTR of OsMADS14, suppressing its expression.
- OsbZIP23 likely forms FRCs with OsFTL1/Hd3a/RFT1 and 14-3-3 proteins, delaying floral transition.
Conclusions:
- OsbZIP23 functions as a novel flowering repressor in rice.
- This study deepens the understanding of molecular mechanisms controlling rice flowering time.
- Findings contribute to strategies for optimizing rice cultivation and yield.
