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Glutamate induces series of action potentials and a decrease in circumnutation rate in Helianthus annuus
Maria Stolarz1, Elzbieta Król, Halina Dziubińska
1Department of Biophysics, Institute of Biology, Maria Curie-Skłodowska University, Akademicka 19, Lublin, Poland. maria.stolarz@poczta.umcs.lublin.pl
Physiologia Plantarum
|January 7, 2010
Summary
Glutamate (Glu) triggers action potentials and long-distance electrical signals in sunflower stems. This amino acid also temporarily reduces stem movement, indicating its role in plant signaling and behavior.
Area of Science:
- Plant Physiology
- Neurobiology
- Biochemistry
Background:
- Limited research exists on glutamate's role in plant electrical and movement phenomena.
- Glutamate is a key neurotransmitter in animals, but its function in plants is less understood.
Purpose of the Study:
- To investigate the effects of glutamate on electrical activity and circumnutation movements in Helianthus annuus L. (sunflower) stems.
- To explore the potential of glutamate as a signaling molecule in vascular plants.
Main Methods:
- Extracellular recording of electrical potential changes in sunflower stems.
- Time-lapse imaging to measure stem circumnutation movements.
- In situ injection of varying glutamate concentrations into the stem base.
Main Results:
- Glutamate injection induced action potentials (APs) at the injection site and propagated them throughout the stem.
- Electrophysiological responses showed both acropetal and basipetal propagation of APs.
- A transient, ~5-hour decrease in stem circumnutation rate was observed following glutamate application.
Conclusions:
- The findings demonstrate a glutamate perception system in vascular plants, suggesting its involvement in electrical, long-distance signaling.
- Glutamate influences plant movement, specifically affecting circumnutation rates in sunflower stems.
- This study highlights glutamate as a significant factor in plant electrophysiology and motor responses.
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