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RETINOBLASTOMA-RELATED Genes Specifically Control Inner Floral Organ Morphogenesis and Pollen Development in Rice
Yuanlin Duan1, Yaguang Chen2, Wenqiang Li2
1Key Laboratory of Genetics, Breeding and Multiple Utilization of Crops, Ministry of Education and Fujian Provincial Key Laboratory of Crop Breeding by Design, Fujian Agriculture and Forestry University, Fuzhou 350002, China ylduan863@fafu.edu.cn.
Plant Physiology
|September 25, 2019
Summary
Rice Retinoblastoma-Related proteins (OsRBR1 and OsRBR2) are crucial for reproductive development, regulating floral organ formation and pollen production with OsMSI1.
Area of Science:
- Plant Molecular Biology
- Plant Reproduction
- Genetics and Genomics
Background:
- The Retinoblastoma-Related (RBR) gene family plays a vital role in plant cell cycle regulation.
- The specific molecular functions of RBR proteins beyond cell cycle control in plants are not fully understood.
- Understanding RBR function is critical for improving plant development and crop yield.
Purpose of the Study:
- To elucidate the functions of OsRBR1 and OsRBR2 in rice (Oryza sativa) growth and development.
- To investigate the specific roles of OsRBR1 and OsRBR2 in floral organ specification and pollen formation.
- To identify interaction partners of OsRBR proteins in rice reproductive development.
Main Methods:
- Forward and reverse genetics approaches were employed in rice.
- Gene expression patterns of OsRBR1 and OsRBR2 were analyzed.
- Protein-protein interactions were investigated, including identifying OsMSI1 as a partner.
Main Results:
- OsRBR1 and OsRBR2 exhibit redundant functions in vegetative organs but distinct roles in flowers.
- OsRBR1 is essential for floral meristem identity and floral homeotic gene regulation.
- OsRBR2 is crucial for stamen development and pollen formation; OsMSI1 interacts with both and is essential for development.
Conclusions:
- OsRBR1 and OsRBR2 play critical, partially distinct roles in rice reproductive development.
- OsRBR1 regulates floral organ identity, while OsRBR2 is vital for pollen production.
- OsRBR1, OsRBR2, and OsMSI1 function together in rice reproductive processes.
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