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X-ray-induced changes in the chromosomes of Limotettix (Homoptera)

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Summary

Male specimens of the Homopteran Limotettix were irradiated with a 400 r dose of X-rays. This treatment produced a variable number of chromosome fragments per cell. These fragments survived over a period of 7 days, which is probably equivalent to more than one cell generation.

A striking difference was observed in the manifestation of irradiation effects at the anaphase stages of the two maturation divisions. At the first division anaphase, bridge formations and laggard chromosomes were frequently found, while both these types of disturbance were practically absent at the second division.

After consideration of an alternative explanation, the conclusion is reached that all the peculiarities of irradiated leafhopper testicular cell progenies are best explained if it is assumed that

  1. 1)

    the chromosomes are holokinetic

  2. 2)

    the mode of meiosis is prereductional.

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Authors and Affiliations

  1. Institute of Genetics, University of Helsinki, Finland

    Olli Halkka

Authors
  1. Olli Halkka
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Additional information

Dedicated to Professor H. Bauer on the occasion of his sixtieth birthday.

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Halkka, O. X-ray-induced changes in the chromosomes of Limotettix (Homoptera). Chromosoma 16, 185–191 (1965). https://doi.org/10.1007/BF00320948

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  • DOI: https://doi.org/10.1007/BF00320948

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