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Functional Characterization of GmRD22 Modulating Nitrogenase Activity in Soybean with Transcriptomic Comparison
Hanyu Zhao1, Jiaying Zhong1, Chao Ma1
1National Key Laboratory of Smart Farm Technology and System, Key Laboratory of Soybean Biology in Chinese Ministry of Education, College of Agriculture, Northeast Agricultural University, Harbin 150030, China.
Plants (Basel, Switzerland)
|August 13, 2026
Summary
Researchers identified a gene, GmRD22, that regulates symbiotic nitrogen fixation (SNF) in soybeans. This gene
Area of Science:
- Plant Science
- Genetics
- Agricultural Science
Background:
- Soybean production is vital for food security, but nitrogen availability limits yield.
- Symbiotic nitrogen fixation (SNF) enhances nitrogen use efficiency and soil health in legumes.
- Understanding SNF regulation in soybean nodules is crucial for improving crop performance.
Purpose of the Study:
- Identify genes controlling nitrogenase activity in soybean.
- Investigate the role of GmRD22 in symbiotic nitrogen fixation.
- Analyze the evolutionary trajectory of GmRD22 during soybean domestication.
Main Methods:
- Transcriptomic analysis of soybean accessions with differing SNF capabilities.
- Functional characterization of the identified GmRD22 gene.
- Haplotype analysis of GmRD22 across wild, landrace, and modern soybean populations.
Main Results:
- The gene Glyma.04G013500, a GmRD22 family member, was linked to nitrogenase activity.
- GmRD22 functions as a negative regulator of nodulation, impacting nodule development genes.
- An elite GmRD22 haplotype (HapI) associated with high SNF increased in frequency during domestication.
Conclusions:
- GmRD22 plays a significant role in regulating soybean nodulation and nitrogen fixation.
- GmRD22 has been under selection during soybean domestication and improvement.
- Targeting GmRD22 offers potential for breeding enhanced nitrogen-fixing soybean varieties.
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