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Mitotic dynamics of micronuclei induced by amiprophos-methyl and prospects for chromosome-mediated gene transfer in plants

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Summary

Mitotic dynamics and the kinetics of mass induction of micronuclei after treatment of Nicotiana plumbaginifolia cell suspensions with the spindle toxin amiprophos-methyl (APM) are reported. The addition of APM to suspension cells resulted in the accumulation of a large number of metaphases. The course of mitosis was strikingly different from normal. Metaphase chromosomes showed neither centromere division nor separation of chromatids. Single chromosomes and groups of 2 or more chromosomes were scattered over the cytoplasm. After 5–6 h of APM treatment, chromosomes decondensed and formed micronuclei. When treatment duration was increased, the frequency of cells with micronuclei as well as those showing lobed micronuclei increased. Similarly, with an increase in APM concentration the frequency of cells with micronuclei increased. After removal of APM, chromosome grouping disappeared, cells showing lobed micronuclei further increased and mitoses with doubled chromosome numbers appeared in the next cell division. Cytological observations and DNA measurements revealed that several sub-diploid micronuclei containing 1 or a few chromosomes can be obtained, and that flow cytometry can detect and sort out these micronuclei. The applications of micronuclei for genetic manipulation of specific chromosomes and gene mapping are indicated.

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Authors and Affiliations

  1. Research Institute Ital, Mail Box 48, NL-6700, AA Wageningen, The Netherlands

    K. Sree Ramulu, H. A. Verhoeven & P. Dijkhuis

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  1. K. Sree Ramulu
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  2. H. A. Verhoeven
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  3. P. Dijkhuis
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Communicated by F. Salamini

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Sree Ramulu, K., Verhoeven, H.A. & Dijkhuis, P. Mitotic dynamics of micronuclei induced by amiprophos-methyl and prospects for chromosome-mediated gene transfer in plants. Theoret. Appl. Genetics 75, 575–584 (1988). https://doi.org/10.1007/BF00289123

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  • DOI: https://doi.org/10.1007/BF00289123

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