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Transcript suppression of TaGW2 increased grain width and weight in bread wheat.
Yantao Hong1, Longfei Chen, Li-pu Du
1The National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
Researchers identified TaGW2 as a gene that negatively controls grain width and weight in bread wheat. Downregulating this gene significantly increased grain size, offering potential for improving wheat yield.
Area of Science:
- Agricultural Science
- Plant Genetics
- Molecular Biology
Background:
- Grain weight is a critical determinant of wheat yield, making gene identification for its regulation essential for crop improvement.
- TaGW2, an ortholog of rice OsGW2, is known to negatively regulate grain width and weight in rice.
Purpose of the Study:
- To investigate the function of TaGW2 homoeologs (TaGW2A, TaGW2B, TaGW2D) in bread wheat (Triticum aestivum L.).
- To determine if TaGW2 plays a role in regulating grain width and weight in wheat.
Main Methods:
- Constructed a TaGW2-RNA interference (RNAi) cassette for gene silencing.
- Transformed the RNAi cassette into a small-grain bread wheat variety ('Shi 4185').
- Analyzed transcript levels and grain morphology in transgenic lines.
Main Results:
- Simultaneous downregulation of TaGW2A, TaGW2B, and TaGW2D transcript levels in transgenic wheat lines.
- TaGW2-underexpressing lines showed significantly increased grain width and weight compared to controls.
- Transcript abundance of TaGW2A was negatively associated with grain width across different wheat accessions.
Conclusions:
- TaGW2 negatively regulates grain width and weight in bread wheat.
- Silencing TaGW2 enhances grain size, indicating its potential for high-yield wheat breeding.
- TaGW2A is a key homoeolog involved in grain width determination.
