Summary
Microtubule organization during preprophase band development was investigated using immunofluorescence microscopy in filamentous protonemal cells (approx. 600 μm in length, 20 μm in width) ofAdiantum capillus-veneris L. Protonemata pre-cultured under red light were transferred to continuous blue light or total darkness to induce synchronous cell division. Preprophase bands were found under both light conditions. In an early stage of development, the preprophase band which is transverse to the cell axis overlapped with an interphase cortical array of microtubules which is random or parallel to the cell axis. The interphase cortical array disappeared thereafter. While the width of the preprophase band became narrow during development under dark conditions, under blue light conditions it did not.
Spatial and temporal aspects of the disappearance of the interphase cortical array of microtubules were also investigated. The interphase cortical array began to disappear at nearly the same time as the beginning of preprophase band formation. Under blue light, the disruption of cortical microtubules started at approx. 150 μm from the tip (approx. 120 μm from the nucleus), and spread toward the tip as far as the nuclear region and toward the base to an area approx. 300–400 μm from the tip. Cortical microtubules remained in the basal part of the protonema. The pattern of disappearance between the tip and nucleus could not be determined. Under dark conditions, the pattern of the disappearance of cortical microtubules was somewhat different in many cells from that encountered with exposure to blue light. Microtubules first re-oriented from longitudinal to transverse, and then gradually disappeared. In some cells, the pattern of disappearance was similar to that observed under blue light.
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Abbreviations
- DAPI:
-
4′, 6′-diamidino-2-phenylindole
- ICM:
-
interphase cortical microtubules
- PBS:
-
phosphate buffered saline
- PPB:
-
preprophase band
- MT:
-
microtubule
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Murata, T., Wada, M. Re-organization of microtubules during preprophase band development inAdiantum protonemata. Protoplasma 151, 73–80 (1989). https://doi.org/10.1007/BF01403443
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DOI: https://doi.org/10.1007/BF01403443