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Ghd8 controls rice photoperiod sensitivity by forming a complex that interacts with Ghd7
Peng Wang1,2, Rong Gong1, Ying Yang1,2
1National Key Laboratory of Crop Genetic Improvement, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China.
BMC Plant Biology
|November 3, 2019
Summary
The flowering time gene Ghd8 regulates rice agronomic traits by activating Ghd7 transcription, influencing photoperiod sensitivity and adaptation. This interaction is crucial for understanding rice yield potential.
Area of Science:
- Plant genetics
- Crop science
- Molecular biology
Background:
- Flowering time is a critical trait for crop yield and adaptation.
- Ghd8 and Ghd7 are key rice genes controlling heading date, plant height, and grain yield.
- The interaction between Ghd8 and Ghd7 was previously unknown.
Purpose of the Study:
- To investigate the genetic interaction between Ghd8 and Ghd7 in rice.
- To elucidate the molecular mechanisms underlying their interaction.
- To understand their roles in rice photoperiod sensitivity and adaptation.
Main Methods:
- Utilized near-isogenic lines and a natural germplasm panel in rice.
- Analyzed the functional dependence of Ghd8 on Ghd7.
- Investigated protein complex formation and DNA binding interactions.
Main Results:
- Ghd8 influences agronomic traits in a Ghd7-dependent manner.
- Ghd8 and Ghd7 are essential for rice photoperiod sensitivity.
- GHD8 forms a complex with HD1 and OsHAP5b to activate Ghd7 transcription via promoter binding.
Conclusions:
- Ghd8 acts upstream of Ghd7, activating its transcription.
- This interaction inhibits Hd3a expression, affecting flowering time.
- The findings clarify the genetic and molecular basis of Ghd8-Ghd7 interactions for rice adaptation.
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