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Updated: Jun 14, 2026
06:46
Confocal Live Imaging of Shoot Apical Meristems from Different Plant Species
Published on: March 29, 2019
Novel insights from live-imaging in shoot meristem development
1Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, MD 20742, USA.
Journal of Integrative Plant Biology
|April 10, 2010
Summary
Live imaging reveals dynamic regulation of plant stem cells. This technique enhances understanding of shoot apical meristem (SAM) organization, development, and hormonal control for predicting plant growth.
Area of Science:
- Plant Biology
- Developmental Biology
- Cell Biology
Background:
- Microscopic imaging of fluorescent reporters is a powerful technique for observing dynamic regulators in living plant cells.
- Live imaging, coupled with computational modeling, provides significant insights into shoot apical meristem (SAM) behavior and function.
Purpose of the Study:
- To review recent advances in understanding SAM organization, development, and behavior using live-imaging techniques.
- To highlight key findings regarding mechanical forces, hormonal signaling, and gene regulatory networks in SAM.
Main Methods:
- Live imaging of fluorescent reporters for meristem regulators.
- Time-lapse microphotography and advanced imaging software.
- Computational modeling of SAM dynamics.
Main Results:
- Revealed mechanical forces in microtubule-controlled anisotropic growth.
- Elucidated the CLV-WUS network's role in cell specification within the SAM.
- Detailed cytokinin feedback loops controlling WUS expression and auxin dynamics in primordia positioning.
- Described regulatory events in de novo shoot assembly from callus.
Conclusions:
- Live-imaging techniques are crucial for understanding SAM organization, development, and stem cell regulation.
- Future "digital SAM" models integrating multi-dimensional data will enhance prediction and manipulation of plant development.
Related Concept Videos
02:36Meristems and Plant Growth
Plants grow throughout their lives; this is called indeterminate growth, and it distinguishes plants from most animals. Although certain parts of plants stop growing (e.g., leaves and flowers), others grow continuously—like roots and stems.
03:02Primary and Secondary Growth in Roots and Shoots
Vascular plants, which account for over 90% of the Earth’s vegetation, all undergo primary growth—which lengthens roots and shoots. Many land plants, notably woody plants, also undergo secondary growth—which thickens roots and shoots.