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  • 1
    Electronic Resource
    Electronic Resource
    Some effects of colchicine on microtubules and cell division in roots ofAzolla pinnata (1980)
    Springer
    Protoplasma 102 (1980), S. 31-51 
    Details
    ISSN: 1615-6102
    Keywords: Microtubules ; Morphogenesis ; Cell Walls ; Roots ; Colchicine ; Cell division
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Removal and subsequent reformation of microtubules in cells of the root-tips ofAzolla pinnata R. Br. was achieved by short pulse treatments with the drug colchicine. Loss of microtubules led to the formation of multinucleate cells more frequently than to the arrest of mitosis at metaphase, and primary and secondary wall formation was also disrupted. Recovery of root development was limited. Growth of all roots ceased 5–6 days after the pulse treatment. Following the reappearance of microtubules, renewed deposition of normal wall thickenings occurred in developing xylem elements. Multinucleate cells became subdivided by walls in the apparent absence of a phragmoplast. The plane in which the new wall was formed was often located as it would have been in an untreated root, but in a number of cases abnormal or precious positioning of new walls was observed. Clusters of microtubules, matrix material, and vesicles or particles, taken to indicate microtubule initiation, were observed during the recovery from treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276946
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reprogramming of cells following wounding in pea (Pisum sativum L.) roots. II. The effects of caffeine and colchicine on the development of new vascular elements (1982)
    Springer
    Protoplasma 112 (1982), S. 152-166 
    Details
    ISSN: 1615-6102
    Keywords: Colchicine ; Caffeine ; Redifferentiation ; Vascular elements ; Wall formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Interference with the normal progression of the cell cycle by the drugs caffeine and colchicine does not prevent parenchyma cells in the cortex of pea roots from being reprogrammed to become tracheary and sieve elements following severance of the vascular cylinder of the root. The pattern of secondary wall deposition of the newly differentiated tracheary elements is highly aberrant in the presence of colchicine but is of normal appearance in the caffeinetreated roots. In each case, the new sieve elements have sieve plates and lateral sieve areas with callose deposits. Induction and redifferentiation are achieved in the absence of cell division and microtubules in colchicine-treated roots. Bi- and multi-nucleate cells are produced by both drugs. Microtubules are still present in the caffeine-treated roots but cell plate formation is inhibited. The partitioning of the multinucleate cortical cells by the interdigitation of “free-growing” walls between the nuclei occurs in the presence of caffeine but not colchicine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284089
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    Paper (German National Licenses)
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