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Time-lapse Fluorescence Imaging of Arabidopsis Root Growth with Rapid Manipulation of The Root Environment Using The RootChip
Published on: July 7, 2012
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Observing root growth and signalling responses to stress gradients and pathogens using the bi-directional dual-flow
Claudia Allan1,2, Yiling Sun3,2, Stephen C Whisson4
1School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch, New Zealand. claudia.meisrimler@canterbury.ac.nz.
Lab on a Chip
|November 7, 2024
Summary
Plants utilize calcium (Ca2+) signaling to adapt to environmental stressors like salinity. A novel RootChip platform revealed dynamic Ca2+ responses in root tissues, influencing growth and defense against pathogens.
Area of Science:
- Plant Physiology
- Biochemistry
- Microfluidics
Background:
- Environmental stressors trigger adaptive growth changes in plants.
- Calcium (Ca2+) acts as a crucial secondary messenger in plant stress responses.
- Understanding root-level signaling under stress is vital for crop resilience.
Purpose of the Study:
- To investigate plant defense signaling and root growth dynamics under controlled environmental stress using microfluidics.
- To analyze calcium (Ca2+) signaling pathways in response to salinity and pathogen interaction.
- To explore plant species-specific responses to salinity stress and root force sensing.
Main Methods:
- Utilized a bi-directional dual-flow RootChip (bi-dfRC) microfluidic platform with a multiplexed media delivery system (MMDS).
- Introduced sodium chloride (NaCl) to create dynamic salinity gradients and studied calcium (Ca2+) signaling using G-CaMP3.
- Analyzed pathogen interactions with root systems and assessed root growth under varying NaCl concentrations and engineered force-sensing elements.
Main Results:
- Salinity stress induced a concentration-dependent Ca2+ burst in the stele tissue, spreading to epidermal cells.
- Xylem transport (propidium iodide) was inhibited by salinity, while pathogen recognition triggered immediate directional Ca2+ signals.
- Different plant species exhibited varied root growth responses to NaCl; *Solanum lycopersicum* showed growth increase, while *Arabidopsis thaliana* and *Nicotiana benthamiana* showed reduction.
Conclusions:
- The bi-dfRC platform effectively simulates environmental fluctuations, revealing dynamic Ca2+ signaling in plant roots.
- Root-level Ca2+ signaling is critical for orchestrating adaptive responses to salinity and pathogen attacks.
- Microfluidic control of fluid flow is essential for advancing the study of root physiology under stress.
