Summary
Caulonema tip cells ofFunaria deposit new oblique cross walls of specific morphology and placement by a highly defined reorientation mechanism. In the presence of the purported intracellular Ca2+ antagonist 8-(N,N-diethylamino)octyl-3,4,5-trimethoxybenzoate (TMB-8), these cross walls form in the proper place but exhibit a distorted morphology. Video microscopy indicates that the deformation takes place during the reorientation of the cell plate from a perpendicular to an oblique configuration. Electron micrographs of TMB-8 treated cells indicate a stabilization of phragmoplast microtubules and a greater amount of vesicles and membrane in the developing cell plate. TMB-8 treated cells also show intense chlortetracycline fluorescence from mitochondria, vesicles and endoplasmic reticulum as compared to untreated cells indicating that TMB-8 is blocking release of Ca2+ from intracellular stores. It is concluded that this may cause distortation of cross walls as they form by delaying vesicle fusion, stabilizing microtubules, and increasing the amount of new wall material in the developing cell plate.
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Abbreviations
- CTC:
-
chlortetracycline
- OsFeCN:
-
osmium ferricyanide method
- TMB-8:
-
8-(N,N-diethylamino)octyl-3,4,5-trimethoxybenzoate
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Saunders, M.J., Jones, K.J. Distortion of plant cell plate formation by the intracellular-calcium antagonist TMB-8. Protoplasma 144, 92–100 (1988). https://doi.org/10.1007/BF01637241
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DOI: https://doi.org/10.1007/BF01637241