Evidence for two sets of cytoplasmic microtubules in interphase and preprophase cells of onion root. An immunofluorescence study.

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Abstract
The interphase microtubular arrays of onion (Allium cepa L.) root meristem cells were visualized with indirect immunofluorescence. Two kinds of cytoplasmic microtubules were distinguished in each interphase cell: cortical and endoplasmic. The cortical microtubules are arranged in an irregular network in isodiametric cells, ribbons running around the long cell axis in some slightly elongated cells and ribbons or rings perpendicular to the long cell axis in elongated cells. The endoplasmic microtubules form a tridimensional network in the endoplasm. Both populations of microtubules behave as two distinct units during preprophase and they exhibit different sensitivity to the action of colchicine.

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