Abstract
The plasticity of elongated nuclei with thread-like basal protrusions was investigated after centrifuging protonemal cells of the fernAdiantum capillus-veneris basipetally for 2 or 3 hr. The morphological recovery of the nuclei including the shortening process of the thread could directly be visualized by video microscopy of nuclei with bubble-like thread ends in centrifuged, living cells. The shortening proceeded in three phases: (1) the fast shortening of the part between the bubble and the nuclear apical main body (NAMB), (2) the slow shrinking of the bubble, (3) the entrance of the nucleolus into the NAMB. Although the thread shortening process was quite uniform, there were irregularities like reextension of the threads over short distances.
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