Stem Cell Regulation in Plant Meristem Development
Summary
Plant meristems are specialised tissues at the tips of shoots and roots that harbour pluripotent stem cells responsible for post-embryonic organogenesis. In the shoot apical meristem (SAM), a balance between stem cell self-renewal and differentiation is maintained by a core intercellular signalling loop centred on the homeodomain transcription factor WUSCHEL and the CLAVATA peptide–receptor system. Phytohormones such as auxin and gaseous signals including nitric oxide intersect with this genetic circuit to refine spatial patterns of gene expression. Epigenetic regulators, notably components of the RNA-directed DNA methylation pathway, further modulate chromatin states in response to developmental cues. Together, these inputs form an integrated network that confers high spatial precision and temporal robustness to meristem function. Understanding these mechanisms has broad significance for crop improvement, as meristem activity underlies yield-defining traits such as inflorescence architecture and fruit set.
Research from Nature Portfolio
Recent studies have revealed that nitric oxide modulates SAM activity by altering DNA methylation patterns via ARGONAUTE 4, a key effector of the RNA-directed DNA methylation pathway. Nitric oxide-dependent interaction between WUSCHEL and ARGONAUTE 4 directs de novo methylation at target loci, thereby fine-tuning stem cell homeostasis. Complementing this, WUSCHEL has been shown to act as an auxin response rheostat: by regulating histone acetylation at auxin signalling genes, WUS buffers dynamic hormone fluctuations to stabilise stem cell identity. In addition, age-dependent arrest of meristem proliferation is controlled by the MADS-box factor FRUITFULL, which directly represses APETALA2 expression. This repression maintains the temporal expression of WUSCHEL, coordinating developmental timing with stem cell cessation and ensuring precise life-span determination in monocarpic species.
Stem Cell Regulation in Plant Meristem Development publication trend
The graph below shows the total number of articles in stem cell regulation in plant meristem development across all publications each year (not limited to Nature Index journals).
Technical terms
Meristem: A plant tissue region containing undifferentiated stem cells that gives rise to organs.
Stem cell niche: The specialised microenvironment within a meristem where stem cell fate is maintained.
WUSCHEL (WUS): A homeodomain transcription factor that specifies stem cell identity in the SAM.
CLAVATA3 (CLV3): A small secreted peptide ligand that restricts WUS expression to balance stem cell number.
Auxin: A plant hormone involved in cell division, elongation and differentiation, with key roles in meristem patterning.
RNA-directed DNA methylation (RdDM): An epigenetic pathway that establishes cytosine methylation guided by small RNAs.
ARGONAUTE 4 (AGO4): An RdDM effector protein that binds small RNAs to target DNA methylation.
FRUITFULL (FUL): A MADS-box transcription factor that promotes developmental timing and meristem arrest.
APETALA2 (AP2): A transcription factor targeted by FRUITFULL to regulate stem cell termination and floral development.
References
- Nitric oxide controls shoot meristem activity via regulation of DNA methylation. Nature Communications (2023).
- Stem Cell Signaling in Arabidopsis Requires CRN to Localize CLV2 to the Plasma Membrane. Plant Physiology (2009).
- Plant stem cell maintenance involves direct transcriptional repression of differentiation program. Molecular Systems Biology (2013).
- WUSCHEL acts as an auxin response rheostat to maintain apical stem cells in Arabidopsis. Nature Communications (2019).
- Genetic control of meristem arrest and life span in Arabidopsis by a FRUITFULL-APETALA2 pathway. Nature Communications (2018).
- Plant Stem Cell Signaling Involves Ligand-Dependent Trafficking of the CLAVATA1 Receptor Kinase. Current Biology (2011).
- The CLV-WUS Stem Cell Signaling Pathway: A Roadmap to Crop Yield Optimization. Plants (2018).
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