Summary
Cytochalasin causes rapid inhibition of cytoplasmic streaming and growth in pollen tubes. In the present study we describe the ultra-structural changes that occur in pollen tubes of Nicotiana alata following treatment with cytochalasins. We utilize rapid freeze fixation and freeze substitution as a method superior to conventional chemical fixation for the preservation of cytoskeletal elements and membrane systems. The results show that either cytochalasin B or cytochalasin D causes microfilaments to form massive bundles throughout the cytoplasm, including the tipmost region of the pollen tube. Other effects include a loss of organelle zonation and vesicle aggregation in the tube tip, the accumulation of large stacks and coils of endoplasmic reticulum, and a crystalline rearrangement of a membrane component of some of the vacuoles. Following removal of cytochalasin the pollen tube ultrastructure returns to its normal configuration.
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Abbreviations
- CB:
-
cytochalasin B
- CD:
-
cytochalasin D
- CF:
-
conventional chemical fixation
- DMSO:
-
dimethylsulfoxide
- MES:
-
2(N-morpholino)ethanesulfonic acid
- MF:
-
microfilament
- MT:
-
microtubule
- PEG:
-
polyethylene glycol
- PM:
-
plasma membrane
- RER:
-
rough endoplasmic reticulum
- RF-FS:
-
rapid freeze fixation-freeze substitution
- RP:
-
rhodamine labelled phalloidin
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Dedicated to Professor Dr. Noburo Kamiya on the occasion of his 75th birthday
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© 1988 Springer-Verlag
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Lancelle, S.A., Hepler, P.K. (1988). Cytochalasin-Induced Ultrastructural Alterations in Nicotiana Pollen Tubes. In: Tazawa, M. (eds) Cell Dynamics. Protoplasma, vol 2. Springer, Vienna. https://doi.org/10.1007/978-3-7091-9011-1_8
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DOI: https://doi.org/10.1007/978-3-7091-9011-1_8
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