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| Content Provider | Springer Nature Link |
|---|---|
| Author | Gervais, C. Newcomb, W. Simmonds, D. H. |
| Copyright Year | 2000 |
| Abstract | Changes in the actin filament and microtubule cytoskeleton were examined during heat- and cytochalasin D-induced embryogenesis in microspores ofBrassica napus cv. Topas by rhodamine phalloidin and immunofluorescence labelling respectively. The nucleus was displaced from its peripheral to a more central position in the cell, and perinuclear actin microfilaments and microtubules extended onto the cytoplasm. Heat treatment induced the formation of a preprophase band of microtubules in microspores; preprophase bands are not associated with the first pollen mitosis. Actin filament association with the preprophase band was not observed. The orientation and position of the mitotic spindle were altered, and it was surrounded with randomly oriented microfilaments. The phragmoplast contained microfilaments and microtubules, as in pollen mitosis I, but it assumed a more central position. Cytoskeletal reorganisation also occurred in microspores subjected to a short cytochalasin D treatment, in the absence of a heat treatment. Cytochalasin D treatment of microspores resulted in dislocated mitotic spindles, disrupted phragmoplasts, and symmetric divisions and led to embryogenesis, confirming that a normal actin cytoskeleton has a role in preventing the induction of embryogenesis. |
| Starting Page | 194 |
| Ending Page | 202 |
| Page Count | 9 |
| File Format | |
| ISSN | 0033183X |
| Journal | Protoplasma |
| Volume Number | 213 |
| Issue Number | 3-4 |
| e-ISSN | 16156102 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2000-01-01 |
| Publisher Place | Vienna |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Actin microfilament Brassica napus Cytochalasin D Microspore embryogenesis Microtubule Preprophase band Cell Biology Plant Sciences Zoology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Plant Science Medicine |
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