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Updated: May 27, 2026
07:52
Live Cell Imaging of Microtubule Cytoskeleton and Micromechanical Manipulation of the Arabidopsis Shoot Apical Meristem
Published on: May 23, 2020
Strategy for shoot meristem proliferation in plants
Hironori Fujita1, Masayoshi Kawaguchi
1Division of Symbiotic Systems, National Institute for Basic Biology, Okazaki, Japan. hfujita@nibb.ac.jp
Plant Signaling & Behavior
|November 10, 2011
Summary
Plant shoot apical meristem (SAM) stem cells control growth. Mathematical models reveal distinct proliferation patterns, leading to either dichotomous or axillary branching, influencing plant evolution.
Area of Science:
- Plant developmental biology
- Computational biology
- Evolutionary botany
Background:
- The shoot apical meristem (SAM) is crucial for plant aerial tissue development, housing stem cells that require precise proliferation control.
- Gene networks, like the WUS-CLV interaction in Arabidopsis thaliana, regulate SAM dynamics.
- Understanding SAM proliferation patterns is key to plant survival and evolutionary strategies.
Purpose of the Study:
- To investigate the mathematical basis of SAM stem cell proliferation patterns.
- To explore how different proliferation dynamics can lead to distinct shoot branching types (dichotomous vs. axillary).
- To understand the evolutionary implications of these branching patterns in plants.
Main Methods:
- Utilized a previously developed mathematical model to simulate SAM stem cell proliferation.
- Analyzed six predicted SAM patterns based on proliferation manner and frequency.
- Compared model predictions with observed branching patterns in extant and extinct plant species.
Main Results:
- Identified two specific SAM proliferation patterns predicting dichotomous or axillary shoot branching.
- Dichotomous branching, characteristic of early vascular plants (e.g., Cooksonia), is rare today.
- Axillary branching, prevalent in most modern plants, is linked to auxin-PIN dynamics.
Conclusions:
- Mathematical modeling provides insights into the control of SAM proliferation and its evolutionary consequences.
- The shift from dichotomous to axillary branching may reflect the adoption of auxin-PIN regulatory systems for stricter growth control.
- This study highlights the interplay between developmental mechanisms and evolutionary trajectories in plant architecture.
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