Abstract
By taking advantage of large cell size of Chara corallina, we analyzed the membrane depolarization induced by decreased turgor pressure (Shimmen in J Plant Res 124:639–644, 2011). In the present study, the response to increased turgor pressure was analyzed. When internodes were incubated in media containing 200 mM dimethyl sulfoxide, their intracellular osmolality gradually increased and reached a steady level after about 3 h. Upon removal of dimethyl sulfoxide, turgor pressure quickly increased. In response to the increase in turgor pressure, the internodes generated a transient membrane depolarization at its nodal end. The refractory period was very long and it took about 2 h for full recovery after the depolarizing response. Involvement of protein synthesis in recovery from refractoriness was suggested, based on experiments using inhibitors.
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Abbreviations
- APW:
-
Artificial pond water
- APW(200 DMSO):
-
APW supplemented with 200 mM DMSO
- CHI:
-
Cycloheximide
- DMSO:
-
Dimethyl sulfoxide
- EAB :
-
Potential difference between pools A and B
- EG:
-
Ethylene glycol
- Пi :
-
Intracellular osmolality
- Πo :
-
Extracellular osmolality
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Acknowledgments
The authors thank Prof. Nobuaki Yanagihara (School of Medicine, University of Occupational and Environmental Health) for his kind supports of the present experiments.
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Shimmen, T., Ogata, K. Transduction of pressure signal to electrical signal upon sudden increase in turgor pressure in Chara corallina . J Plant Res 126, 439–446 (2013). https://doi.org/10.1007/s10265-012-0537-z
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DOI: https://doi.org/10.1007/s10265-012-0537-z