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Microtubule cytoskeleton in intact and wounded coenocytic green algae

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Abstract

Microtubule (MT) arrangements were investigated, with immunofluorescence and electron microscopy, in two related species of coenocytic green algae. Intact cells of both Ernodesmis verticillata (Kützing) Boergesen and Boergesenia forbesii (Harvey) Feldmann have two morphologically distinct populations of MTs: a highly regular cortical array consisting of a single layer of parallel, longitudinal MTs; and perinuclear MTs radiating from the surface of the envelope of each interphase nucleus. In both algae, mitotic figures lack perinuclear MTs around them. Pre-incubation with taxol does not alter the appearance of these arrays. The cortical and nuclear MTs appear to coexist throughout the nuclear cycle, unlike the condition in most plant cells. At the cut/contracting ends of wounded Ernodesmis cells, cortical MTs exhibit bundling and marked convolution, with some curvature and slight bundling of MTs throughout the cell cortices. In Boergesenia, wound-induced reticulation and separation of the protoplasm into numerous spheres also involves a fasciation of MTs within the attenuating regions of the cytoplasm. Although some cortical MTs are fairly resistant to cold and amiprophos-methyl-induced depolymerization, the perinuclear ones are very labile, depolymerizing in 5–10 min in the cold. The MT cytoskeleton is not believed to be directly involved in wound-induced motility in these plants because amiprophos-methyl and cold depolymerize most cortical MTs without inhibiting motility. Also, the identical MT distributions in intact cells of these two algae belie the very different patterns of cytoplasmic motility. Although certain roles of the MT arrays may be ruled out, their exact functions in these plants are not known.

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Abbreviations

APM:

amiprophos-methyl

DIC:

differential interference contrast

EGTA:

ethylene glycol-bis(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid

FITC:

fluorescein isothiocyanate

MT(s):

microtubule(s)

PBS:

phosphate-buffered saline

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  1. Department of Botany, University of Texas, 78713, Austin, TX, USA

    J. W. La Claire II

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La Claire, J.W. Microtubule cytoskeleton in intact and wounded coenocytic green algae. Planta 171, 30–42 (1987). https://doi.org/10.1007/BF00395065

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  • DOI: https://doi.org/10.1007/BF00395065

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