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Spore liberation in mosses revisited
Friederike Gallenmüller1, Max Langer1, Simon Poppinga1,2
1Plant Biomechanics Group, Botanic Garden, University of Freiburg, Freiburg im Breisgau, Germany.
Aob PLANTS
|January 27, 2018
Summary
Moss peristome teeth use complex hygroscopic movements for spore release. Differential layer properties and gradients drive these movements, regulating capsule opening and closing with humidity changes.
Area of Science:
- Plant biology
- Biomechanics
- Morphology
Background:
- Hygroscopic movements are crucial for plant functions like spore release.
- In mosses, peristome teeth and spore capsules control spore release via hygroscopic movements.
Purpose of the Study:
- To analyze the kinematics of peristome teeth shape changes in response to humidity.
- To investigate the functional morphology and anatomy underlying these movements in *Brachythecium populeum*.
Main Methods:
- Spatially and temporally resolved kinematic analyses of peristome teeth.
- Functional anatomical studies of peristome teeth structure.
- Experiments with isolated peristome tooth layers.
Main Results:
- Peristome teeth exhibit complex inward dipping (hydration) and outward flicking (desiccation) movements.
- Teeth consist of two layers with longitudinal gradients in material composition, structure, and geometry.
- These gradients likely cause differential swelling/shrinking, driving the observed movements and regulating capsule opening/closing.
Conclusions:
- The study elucidates the mechanism of humidity-based spore release regulation in mosses.
- Functional morphology of peristome teeth, driven by material gradients, is key to spore dispersal.
- Findings offer insights into the evolution of hygroscopic adaptations in plants.
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