Subthreshold changes in excitable membranes ofCucurbits pepoL. stem cells during cooling-induced action-potential generation
✍ Scribed by S. S. Pyatygin; V. A. Opritov; V. A. Khudyakov
- Publisher
- Springer-Verlag
- Year
- 1992
- Tongue
- English
- Weight
- 507 KB
- Volume
- 186
- Category
- Article
- ISSN
- 0032-0935
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✦ Synopsis
The nature of subthreshold changes in excitable plasma membranes has been investigated in stem parenchyma cells of Cucurbita pepo L. during action-potential generation induced by gradual cooling (from 23 to 10 ~ C). The character of the subthreshold depolarization of excitable cells is shown to be mainly defined by a decrease in the activity of the plasma-membrane electrogenic pump (H+-ATPase). In its turn, the pump activity is controlled by thermal changes in the structure of the membrane lipid matrix. Based on the results obtained, a sequence of subthreshold changes has been suggested in which thermally induced structural rearrangements of membrane lipids play the role of trigger.