Abstract
A procedure is presented for the immunocytochemical visualization of microtubules in interphase and mitotic cells of Haemanthus endosperm. It includes preservation of microtubules (MTs) with glutaraldehyde and uses colloidal gold, coated with secondary antibodies, in a novel indirect-light microscopic technique: the immuno-gold staining method. This immunocytochemical stain allows us to follow the changes in distribution of MTs during mitosis with greater precision and specificity than allowed by other light microscopic techniques. Many aspects of MT arrangements, as reported from ultrastructural studies, are corroborated and extended. This demonstrates the reliability of the technique. In addition, a number of significant observations were made. These concern (i) the presence of a network of MTs in interphase cells, (ii) the transformation of this network into a spindle-like cage of MTs (the clear zone) surrounding the nucleus during prophase, (iii) the drastic rearrangement of MT distribution during prometaphase, (iv) new evidence for the formation of aster-like arrays of polar MTs during anaphase, and (v) the development of the phragmoplast.
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