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A model for soybean inflorescence architecture based on morphological and gene expression analysis.
Francisca Pozo-Muñoz1, Ana Berbel1, Fanjiang Kong2
1Instituto de Biología Molecular y Celular de Plantas, CSIC-UPV, Campus de Vera, 46022, Valencia, Spain.
Planta
|November 13, 2025
Summary
Soybean inflorescence architecture clarified: it
Area of Science:
- Plant biology
- Genetics
- Agricultural science
Background:
- Soybean (Glycine max) inflorescence architecture and development regulation remain poorly understood, despite its importance for crop yield.
- Existing models for inflorescence development in legumes like pea and Medicago truncatula are not fully resolved for soybean.
- The gene responsible for specifying secondary inflorescence (I2) meristem identity in soybean is not clearly identified.
Purpose of the Study:
- To provide a comprehensive analysis of soybean inflorescence architecture.
- To investigate the gene network controlling soybean inflorescence development, focusing on meristem identity genes.
- To clarify the role of DT1, DT2, and GmAP1a in soybean inflorescence and floral meristem specification.
Main Methods:
- Macroscopic and microscopic observations to detail soybean inflorescence structure.
- RNA in situ hybridization to analyze the spatial and temporal expression patterns of key meristem identity genes (DT1, DT2, GmAP1a).
- Comparative analysis with established legume models to infer regulatory network conservation.
Main Results:
- Soybean exhibits a compound inflorescence, characterized by flowers developing in secondary inflorescences (I2), consistent with a compound raceme structure.
- DT1 and GmAP1a genes are implicated in specifying the primary inflorescence (I1) and floral meristem identities, respectively.
- Dt2 gene expression specifically in I2 meristems strongly suggests its role in specifying secondary inflorescence meristem identity.
Conclusions:
- This study resolves the controversy surrounding soybean inflorescence architecture, defining it as a compound raceme.
- The findings elucidate critical components of the gene network controlling soybean inflorescence development, highlighting the role of DT1, DT2, and GmAP1a.
- The results indicate conservation of the inflorescence gene regulatory network between soybean and other legumes, with Dt2 playing a key role in I2 meristem identity.
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