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The LBD12-1 Transcription Factor Suppresses Apical Meristem Size by Repressing Argonaute 10 Expression
Weiwei Ma1,2, Fuqing Wu1,2, Peike Sheng1,2
1National Key Facility for Crop Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China (W.M., F.W., P.S., X.W., Z.Z., Q.L., Z.C., J. Wang, S.Z., X.Z., X.G., H.W., C.W., H.Z., J. Wan); and.
Rice plants overexpressing LBD12-1 show stunted growth by repressing AGO10 expression. This LBD12-1 regulation of AGO10 is crucial for maintaining shoot apical meristem (SAM) size, especially under stress conditions.
Area of Science:
- Plant biology
- Molecular genetics
- Developmental biology
Background:
- The shoot apical meristem (SAM) is vital for plant growth, maintaining stem cells for aerial structure development.
- Argonaute (AGO) genes, particularly AGO10, regulate SAM development by modulating microRNA activity.
- Transcriptional regulation of AGO10 remains poorly understood.
Purpose of the Study:
- To investigate the transcriptional regulation of AGO10.
- To elucidate the role of LBD12-1 in SAM maintenance and stress response.
- To understand how AGO10 expression is controlled under stress.
Main Methods:
- Generation and analysis of transgenic rice plants overexpressing LBD12-1.
- Analysis of lbd12-1 loss-of-function mutants.
- Promoter binding assays to determine LBD12-1 interaction with the AGO10 promoter.
- Phenotypic analysis under normal and salt stress conditions.
Main Results:
- Overexpression of LBD12-1 in rice leads to reduced SAM size, stunted growth, and developmental abnormalities.
- LBD12-1 directly binds to the AGO10 promoter and represses its expression.
- Overexpression of AGO10 rescues the growth defects caused by LBD12-1 overexpression.
- LBD12-1 expression and its binding to the AGO10 promoter are induced by stress.
- lbd12-1 mutants exhibit larger SAMs under salt stress compared to wild type.
Conclusions:
- LBD12-1 acts as a transcriptional repressor of AGO10, influencing SAM size.
- The LBD12-1/AGO10 regulatory pathway is critical for SAM development and stress adaptation in rice.
- This study reveals a novel mechanism controlling SAM size under stress conditions.
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