Summary
Developing tracheary elements in suspension cultures ofZinnia elegans fluoresce intensely relative to non-differentiating cells when stained with chlorotetracycline (CTC), a fluorescent chelate probe for membrane associated calcium. This suggests that a change in calcium uptake or subcellular distribution accompanies the onset of tracheary element differentiation. A few cells in early differentiating cultures were brightly fluorescent, but did not have visible cell wall thickenings, suggesting that a rise in sequestered calcium may precede visible differentiation. Diffuse CTC fluorescence in early differentiation most likely results from sequestration of calcium in the endoplasmic reticulum. Late in differentiation, CTC fluorescence becomes punctate in appearance, probably due to loss of plasma membrane integrity occurring at the onset of autolysis.Zinnia suspension culture cells were found to be very sensitive to CTC and low concentrations (10 μM) were used to assure accurate localization of membrane-associated calcium in healthy cells.
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Abbreviations
- CTC:
-
chlorotetracycline
- DIC:
-
differential interference contrast
- DiOC6 :
-
3,3′-dihexyloxacarbocyanine iodide
- ER:
-
endoplasmic reticulum
- EGTA:
-
ethylene glycol bis-(amino-ethyl ether) N,N,N1N1-tetraacetic acid
- NPN:
-
n-phenylnaphthylamine
- OsFeCN:
-
osmium tetroxide and potassium ferricyanide
- TE:
-
tracheary element
- TEM:
-
transmission electron microscopy
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Roberts, A.W., Haigler, C.H. Rise in chlorotetracycline fluorescence accompanies tracheary element differentiation in suspension cultures ofZinnia . Protoplasma 152, 37–45 (1989). https://doi.org/10.1007/BF01354238
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DOI: https://doi.org/10.1007/BF01354238