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Wind-induced plant motion immediately increases cytosolic calcium
M R Knight1, S M Smith, A J Trewavas
1Institute of Cell and Molecular Biology, University of Edinburgh, United Kingdom.
Summary
Wind triggers a rapid increase in plant cell calcium, crucial for sensing mechanical stress. This calcium signaling, originating from internal stores, plays a key role in how plants perceive and respond to wind, influencing their growth and form.
Area of Science:
- Plant Biology
- Biophysics
- Cell Signaling
Background:
- Wind is a significant environmental factor affecting plant development and yield.
- The mechanisms by which plants perceive and respond to wind stimuli at the cellular level are not well understood.
- Understanding mechanoperception is vital for plant morphogenesis.
Purpose of the Study:
- To investigate how wind signals are perceived and transduced by plant cells.
- To identify the role of intracellular calcium in wind signal transduction.
- To explore the link between mechanoperception, calcium signaling, and plant form.
Main Methods:
- Genetic transformation of Nicotiana plumbaginifolia to express aequorin, creating luminous plants that report cytosolic calcium levels.
- Application of wind stimulation to observe changes in plant luminescence (cytosolic calcium).
- Use of specific inhibitors to determine the source of calcium and the role of mechanical movement.
Main Results:
- Wind stimulation caused immediate increases in cytosolic calcium in luminous plants.
- Evidence suggests calcium is mobilized from organelle sources.
- Calcium increases were dependent on the actual motion of plant tissues, indicating mechanical stimulation is key.
- Repeated wind stimulation led to cellular refractoriness, with rapid recovery upon diminished stimulation.
- Mechanoperception appears to be transduced through intracellular calcium.
Conclusions:
- Mechanical stimulation from wind-induced tissue movement triggers rapid increases in cytosolic calcium.
- Intracellular calcium signaling is likely a primary mechanism for mechanoperception in plant cells.
- Calcium plays a central role in controlling and generating plant form in response to environmental cues like wind.