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DHD6 Delays Flowering in Rice by Negatively Regulating the Expression of Ehd1.
Qiping Sun1, Le Song1, Juan Zhao1,2
1State Key Laboratory of Agricultural Microbiology, Hubei Hongshan Laboratory, Hubei Key Laboratory of Plant Pathology, The Center of Crop Nanobiotechnology, Huazhong Agricultural University, Wuhan 430070, China.
Plants (Basel, Switzerland)
|November 27, 2025
Summary
Delayed Heading Date 6 (DHD6) gene delays flowering time in rice by regulating the Ehd1 gene. Natural DHD6 variations contribute to rice
Area of Science:
- Plant genetics
- Molecular biology
- Agricultural science
Background:
- Heading date, or flowering time, is critical for regional rice adaptability.
- Flowering time is controlled by multiple genes within photoperiod pathways.
Purpose of the Study:
- To isolate and characterize the Delayed Heading Date 6 (DHD6) gene in rice.
- To understand the function of DHD6 in regulating flowering time and its interaction with other genes.
- To investigate the role of natural DHD6 alleles in rice geographic adaptation.
Main Methods:
- Isolation of the DHD6 gene from a whole-genome-sequenced rice mutant population.
- Analysis of a 2 bp deletion in the DHD6 coding region and its effect on protein structure.
- Genetic analysis to determine DHD6's position and interactions within flowering time pathways.
Main Results:
- A 2 bp deletion in DHD6 causes protein truncation, leading to early flowering.
- DHD6 functions upstream of Ehd1, showing synergistic effects with Se14 and PHYC.
- Natural DHD6 alleles are linked to heading date variations and geographic adaptation in rice.
Conclusions:
- DHD6 acts upstream of Ehd1, reducing its transcription and delaying flowering.
- DHD6 is a key regulator of rice flowering time and adaptation.
- Understanding DHD6 provides insights into crop improvement for diverse environments.
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