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Early Gravi-Electrical Responses in Bean Epicotyls
H. Shigematsu1, K. Toko, T. Matsuno
1Department of Electronics, Faculty of Engineering, Kyushu University 36, Fukuoka 812, Japan.
Plant Physiology
|July 1, 1994
Summary
Gravitropism in adzuki bean seedlings involves rapid electrical potential changes on the stem
Area of Science:
- Plant biology
- Plant physiology
- Gravitropism
Background:
- Gravitropism is a key plant growth response to gravity.
- Understanding the initial mechanisms of gravity perception is crucial.
Purpose of the Study:
- To investigate the relationship between gravitropism and surface electrical potentials in adzuki bean epicotyls.
- To identify the earliest physiological events following gravistimulation.
Main Methods:
- Using etiolated epicotyls of adzuki bean (Phaseolus angularis).
- Measuring surface electrical potentials and observing plant curvature after gravistimulation.
Main Results:
- An early downward curvature (transient positive gravitropic response) was observed within 1 minute.
- Surface electrical potentials decreased rapidly and cooperatively on the upper side within 0.5 to 2 minutes.
- This rapid potential change strongly correlated with both early downward and subsequent negative gravitropism.
Conclusions:
- The rapid change in surface electrical potential is the earliest detected event after gravistimulation.
- This electrical potential change likely plays a critical role in gravity perception in plants.
