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- Title
PH-DEPENDENCE OF CHLORTETRACYCLINE(CTC)-INDUCED PLUG FORMATION IN <em>NITELLA FLEXILIS</em> (CHARACEAE).
- Authors
Foissner, Ilse
- Abstract
The formation of chlortetracycline (CTC)-induced wall appositions (callose plugs) in Nitella flexilis (L.) Ag. Was pH-dependent in the range between 4.3-8.3. Plug number and plug diameter increased with the pH of the CTC solution. At pH 4.3 plug formation was light-dependent and occurred below the alkaline regions of the cell surface which form during photosynthetic assimilation of HCO[SUP1][SUB3] Inhibition of photosynthesis by 3-(3', 4' -dichlorophenyl)-1, 1-dimethylurea prevented plug formation in the light. Dark-treated cells could be induced to form plugs by raising the pH of the CTC solution. The formation of large but incomplete plugs in the presence of cytochalasin B is explained by the formation of numerous weak alkaline sites. I suggest that CTC enhances locally the Ca[SUP2+] content at the cytoplasm near the plasmamembrane. The ionophoric character of CTC is probably more pronounced at high pH mainly because of a weaker binding with cations and a closer contact with the membrane.
- Subjects
PHOTOSYNTHESIS; CHLORTHALIDONE; CHARACEAE; NITELLA
- Publication
Journal of Phycology, 1989, Vol 25, Issue 2, p313
- ISSN
0022-3646
- Publication type
Article
- DOI
10.1111/j.1529-8817.1989.tb00128.x